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Dhont E, Van Der Heggen T, Snauwaert E, Willems J, Croubels S, Delanghe J, De Waele JJ, Colman R, Vande Walle J, De Paepe P, De Cock PA. Predictors of augmented renal clearance based on iohexol plasma clearance in critically ill children. Pediatr Nephrol 2024; 39:1607-1616. [PMID: 37994980 DOI: 10.1007/s00467-023-06221-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 10/26/2023] [Accepted: 10/26/2023] [Indexed: 11/24/2023]
Abstract
BACKGROUND Augmented renal clearance (ARC) holds a risk of subtherapeutic drug concentrations. Knowledge of patient-, disease-, and therapy-related factors associated with ARC would allow predicting which patients would benefit from intensified dosing regimens. This study aimed to identify ARC predictors and to describe ARC time-course in critically ill children, using iohexol plasma clearance (CLiohexol) to measure glomerular filtration rate (GFR). METHODS This is a retrospective analysis of data from the "IOHEXOL" study which validated GFR estimating formulas (eGFR) against CLiohexol. Critically ill children with normal serum creatinine were included, and CLiohexol was performed as soon as possible after pediatric intensive care unit (PICU) admission (CLiohexol1) and repeated (CLiohexol2) after 48-72 h whenever possible. ARC was defined as CLiohexol exceeding normal GFR for age plus two standard deviations. RESULTS Eighty-five patients were included; 57% were postoperative patients. Median CLiohexol1 was 122 mL/min/1.73 m2 (IQR 75-152). Forty patients (47%) expressed ARC on CLiohexol1. Major surgery other than cardiac surgery and eGFR were found as independent predictors of ARC. An eGFR cut-off value of 99 mL/min/1.73 m2 and 140 mL/min/1.73 m2 was suggested to identify ARC in children under and above 2 years, respectively. ARC showed a tendency to persist on CLiohexol2. CONCLUSIONS Our findings raise PICU clinician awareness about increased risk for ARC after major surgery and in patients with eGFR above age-specific thresholds. This knowledge enables identification of patients with an ARC risk profile who would potentially benefit from a dose increase at initiation of treatment to avoid underexposure. TRIAL REGISTRATION ClinicalTrials.gov NCT05179564, registered retrospectively on January 5, 2022.
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Affiliation(s)
- Evelyn Dhont
- Pediatric Intensive Care Unit, Department of Intensive Care Medicine, Ghent University Hospital, C. Heymanslaan 10, 9000, Ghent, Belgium.
- Department of Basic and Applied Medical Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium.
- Department of Internal Medicine and Pediatrics, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium.
| | - Tatjana Van Der Heggen
- Department of Basic and Applied Medical Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Evelien Snauwaert
- Department of Internal Medicine and Pediatrics, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
- Department of Pediatric Nephrology, ERKNet Center, Ghent University Hospital, Ghent, Belgium
| | - Jef Willems
- Pediatric Intensive Care Unit, Department of Intensive Care Medicine, Ghent University Hospital, C. Heymanslaan 10, 9000, Ghent, Belgium
- Department of Internal Medicine and Pediatrics, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Siska Croubels
- Department of Pathobiology, Pharmacology and Zoological Medicine, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - Joris Delanghe
- Department of Diagnostic Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Jan J De Waele
- Department of Internal Medicine and Pediatrics, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
- Department of Intensive Care Medicine, Ghent University Hospital, Ghent, Belgium
| | - Roos Colman
- Biostatistics Unit, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Johan Vande Walle
- Department of Internal Medicine and Pediatrics, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
- Department of Pediatric Nephrology, ERKNet Center, Ghent University Hospital, Ghent, Belgium
| | - Peter De Paepe
- Department of Basic and Applied Medical Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Pieter A De Cock
- Pediatric Intensive Care Unit, Department of Intensive Care Medicine, Ghent University Hospital, C. Heymanslaan 10, 9000, Ghent, Belgium
- Department of Basic and Applied Medical Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
- Department of Pharmacy, Ghent University Hospital, Ghent, Belgium
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Liu C, He X, Li J, Ma J, Yue J, Wang Z, Chen M. Selective electrophilic attack towards organic micropollutants with superior Fenton-like activity by biochar-supported cobalt single-atom catalyst. J Colloid Interface Sci 2024; 657:155-168. [PMID: 38035418 DOI: 10.1016/j.jcis.2023.11.131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 11/20/2023] [Accepted: 11/21/2023] [Indexed: 12/02/2023]
Abstract
The global shortage of freshwater and inadequate supply of clean water have necessitated the implementation of robust technologies for wastewater purification, and Fenton-like chemistry is a highly-promising approach. However, realizing the rapid Fenton-like chemistry for high-efficiency degradation of organic micropollutants (OMs) remains challenging. Herein, one novel system was constructed by a Co single-atom catalyst activating peroxymonosulfate (PMS), and the optimal system (SA-Co-NBC-0.2/PMS) achieved unprecedented catalytic performance towards a model OM [Iohexol (IOH)], i.e., almost 100% decay ratio in only 10 min (the observed rate constant: 0.444 min-1) with high electrophilic species 1O2 (singlet oxygen) generation. Theoretical calculations unveiled that Co-N4 sites preferred to adsorb the terminal-O of PMS (more negative adsorption energy than other O sites: -32.67 kcal/mol), promoting the oxidation of PMS to generate 1O2. Iodine (I)23 (0.1097), I24 (0.1154) and I25 (0.0898) on IOH with higher f- electrophilic values were thus identified as the main attack sites. Furthermore, 16S ribosomal RNA high-throughput sequencing and quantitative structure-activity relationship analysis illustrated the environmentally-benign property of the SA-Co-NBC-0.2 and the tapering ecological risk during IOH degradation process. Significantly, this work comprehensively checked the competence of the SA-Co-NBC-0.2/PMS system for organics abatement in practical wastewater.
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Affiliation(s)
- Chen Liu
- Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China
| | - Xinxia He
- Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China
| | - Jinglu Li
- Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China
| | - Jun Ma
- Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China
| | - Junpeng Yue
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
| | - Ziwei Wang
- Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
| | - Ming Chen
- Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China.
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de Freitas JB, de Almeida GLG, de Almeida MB, Dos Santos E Castro D, Gomes VH, de Almeida Balthazar D. Evaluation of the technique of localization of the epidural space with the aid of a peripheral nerve stimulator and epidurographic, comparing two techniques for determining the infused volume, in rabbits (Oryctolagus Cuniculus). Res Vet Sci 2024; 168:105115. [PMID: 38199013 DOI: 10.1016/j.rvsc.2023.105115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 11/05/2023] [Accepted: 12/14/2023] [Indexed: 01/12/2024]
Abstract
Veterinary care for rabbits has been growing, and, consequently, the anesthetic and analgesic management of this species must be improved. The aim of the present study was to evaluate the technique of localization of the epidural space with the aid of a peripheral nerve stimulator and epidurographic, comparing two techniques for determining the infused volume in rabbits (Oryctolagus Cuniculus). In a prospective, randomized blinded study, six healthy New Zealand rabbits, adults, and weighing from 2.2 kg to 3.8 kg received two treatments, at 1 week intervals: 0.33 mL/kg (treatment I) or 0.05 mL per centimeter of the spine (treatment II) of ioexol epidurally. In both treatments, a peripheral nerve stimulator (2 Hz, 0.25 mA and 0.1 milliseconds) was used to determine the location of the epidural space. Latero-lateral and ventro-dorsal radiographs were taken after five (T5) and twenty-five minutes (T25) of iohexol administration. The epidural space was correctly accessed in 92% of attempts. Treatment I received a smaller volume of contrast than treatment II, 1.0 ± 0.2 mL versus 2.1 ± 0.1 mL (mean ± standard deviation), respectively (p = 0.007). At T5, the cranial progression of the contrast varied between L4 and L5 in treatment I, and L5 and T10 in treatment II. At T25, no contrast was observed in any rabbit. In conclusion, peripheral nerve stimulator aided in accessing the lumbosacral epidural space, and the administration of 0.05 mL per centimeter of the spine resulted in greater cranial progression of contrast.
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Affiliation(s)
- Jacqueline Batista de Freitas
- Department of Veterinary Medicine and Surgery, Universidade Federal Rural do Rio de Janeiro, UFRRJ, Seropédica, RJ, Brazil
| | - Gustavo Luiz Gouvêa de Almeida
- Department of Veterinary Medicine and Surgery, Universidade Federal Rural do Rio de Janeiro, UFRRJ, Seropédica, RJ, Brazil
| | - Marcelo Barbosa de Almeida
- Department of Veterinary Medicine and Surgery, Universidade Federal Rural do Rio de Janeiro, UFRRJ, Seropédica, RJ, Brazil
| | - Douglas Dos Santos E Castro
- Department of Veterinary Medicine and Surgery, Universidade Federal Rural do Rio de Janeiro, UFRRJ, Seropédica, RJ, Brazil
| | - Viviane Horta Gomes
- Department of Veterinary Medicine and Surgery, Universidade Federal Rural do Rio de Janeiro, UFRRJ, Seropédica, RJ, Brazil; Department of Veterinary Medicine, Universidade Castelo Branco, UCB, Rio de Janeiro, RJ, Brazil.
| | - Daniel de Almeida Balthazar
- Department of Veterinary Medicine and Surgery, Universidade Federal Rural do Rio de Janeiro, UFRRJ, Seropédica, RJ, Brazil
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Berezin KV, Grabarchuk EV, Lichter AM, Dvoretski KN, Tuchin VV. Optical clearing of human skin: Molecular modeling and in vivo OCT study. J Biophotonics 2024; 17:e202300354. [PMID: 38018875 DOI: 10.1002/jbio.202300354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 11/16/2023] [Accepted: 11/20/2023] [Indexed: 11/30/2023]
Abstract
The results of in vivo immersion optical clearing of human skin under the action of two different optical clearing agents (OCAs), such as an aqueous sucrose solution and a radiographic contrast agent Omnipaque™ 300 (iohexol), were obtained with the use of optical coherence tomography (OCT) method. The rate of reduction of light scattering coefficient, obtained through an averaged A-scan of the OCT image in the region of dermis within the depths from 350 to 700 μm, were determined to evaluate the efficiency of optical clearing (EOC). The correlations between the EOC and the energy of intermolecular interaction of OCAs with a fragment of collagen peptide have been established as a result of molecular modeling by quantum chemistry methods HF/STO3G/DFT/B3LYP/6-311G(d) of a number of OCAs (glycerol, iohexol, sucrose, ribose, fructose, glucose) with mimetic peptide of collagen (GPH)3 .
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Affiliation(s)
- K V Berezin
- Institute of Physics, Saratov State University, Saratov, Russia
| | - E V Grabarchuk
- Astrakhan Tatishchev State University, Astrakhan, Russia
| | - A M Lichter
- Astrakhan Tatishchev State University, Astrakhan, Russia
| | | | - V V Tuchin
- Institute of Physics, Saratov State University, Saratov, Russia
- Science Medical Center, Saratov State University, Saratov, Russia
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Lau EY, Cragg A, Small SS, Butcher K, Hohl CM. Characterizing and Comparing Adverse Drug Events Documented in 2 Spontaneous Reporting Systems in the Lower Mainland of British Columbia, Canada: Retrospective Observational Study. JMIR Hum Factors 2024; 11:e52495. [PMID: 38236629 PMCID: PMC10835584 DOI: 10.2196/52495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 12/06/2023] [Accepted: 12/07/2023] [Indexed: 01/19/2024] Open
Abstract
BACKGROUND Robust adverse drug event (ADE) reporting systems are crucial to monitor and identify drug safety signals, but the quantity and type of ADEs captured may vary by system characteristics. OBJECTIVE We compared ADEs reported in 2 different reporting systems in the same jurisdictions, the Patient Safety and Learning System-Adverse Drug Reaction (PSLS-ADR) and ActionADE, to understand report variation. METHODS This retrospective observational study analyzed reports entered into PSLS-ADR and ActionADE systems between December 1, 2019, and December 31, 2022. We conducted a comprehensive analysis including all events from both reporting systems to examine coverage and usage and understand the types of events captured in both systems. We calculated descriptive statistics for reporting facility type, patient demographics, serious events, and most reported drugs. We conducted a subanalysis focused on adverse drug reactions to enable direct comparisons between systems in terms of the volume and events reported. We stratified results by reporting system. RESULTS We performed the comprehensive analysis on 3248 ADE reports, of which 12.4% (375/3035) were reported in PSLS-ADR and 87.6% (2660/3035) were reported in ActionADE. Distribution of all events and serious events varied slightly between the 2 systems. Iohexol, gadobutrol, and empagliflozin were the most common culprit drugs (173/375, 46.2%) in PSLS-ADR, while hydrochlorothiazide, apixaban, and ramipril (308/2660, 11.6%) were common in ActionADE. We included 2728 reports in the subanalysis of adverse drug reactions, of which 12.9% (353/2728) were reported in PSLS-ADR and 86.4% (2357/2728) were reported in ActionADE. ActionADE captured 4- to 6-fold more comparable events than PSLS-ADR over this study's period. CONCLUSIONS User-friendly and robust reporting systems are vital for pharmacovigilance and patient safety. This study highlights substantial differences in ADE data that were generated by different reporting systems. Understanding system factors that lead to varying reporting patterns can enhance ADE monitoring and should be taken into account when evaluating drug safety signals.
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Affiliation(s)
- Erica Y Lau
- Department of Emergency Medicine, University of British Columbia, Vancouver, BC, Canada
- Centre for Clinical Epidemiology and Evaluation, Vancouver Coastal Health Research Centre, Vancouver, BC, Canada
| | - Amber Cragg
- Centre for Clinical Epidemiology and Evaluation, Vancouver Coastal Health Research Centre, Vancouver, BC, Canada
| | - Serena S Small
- Centre for Clinical Epidemiology and Evaluation, Vancouver Coastal Health Research Centre, Vancouver, BC, Canada
| | - Katherine Butcher
- Pharmaceutical Science, Vancouver General Hospital, Vancouver Coastal Health, Vancouver, BC, Canada
| | - Corinne M Hohl
- Department of Emergency Medicine, University of British Columbia, Vancouver, BC, Canada
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Chen Y, Feng L, Huang Z, Zou W, Luo G, Dai G, Zhao W, Cai W, Luo M. Comparison of Diatrizoate and Iohexol for Patient Acceptance and Fecal-Tagging Performance in Noncathartic CT Colonography. J Comput Assist Tomogr 2024; 48:55-63. [PMID: 37558647 DOI: 10.1097/rct.0000000000001526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
OBJECTIVE The aim of this study was to compare diatrizoate and iohexol regarding patient acceptance and fecal-tagging performance in noncathartic computed tomography colonography. METHODS This study enrolled 284 volunteers with fecal tagging by either diatrizoate or iohexol at an iodine concentration of 13.33 mg/mL and an iodine load of 24 g. Patient acceptance was rated on a 4-point scale of gastrointestinal discomfort. Two gastrointestinal radiologists jointly analyzed image quality, fecal-tagging density and homogeneity, and residual contrast agent in the small intestine. The results were compared by the generalized estimating equation method. RESULTS Patient acceptance was comparable between the 2 groups (3.95 ± 0.22 vs 3.96 ± 0.20, P = 0.777). The diatrizoate group had less residual fluid and stool than the iohexol group ( P = 0.019, P = 0.004, respectively). There was no significant difference in colorectal distention, residual fluid, and stool tagging quality between the 2 groups (all P 's > 0.05). The mean 2-dimensional image quality score was 4.59 ± 0.68 with diatrizoate and 3.60 ± 1.14 with iohexol ( P < 0.001). The attenuation of tagged feces was 581 ± 66 HU with diatrizoate and 1038 ± 117 HU with iohexol ( P < 0.001). Residual contrast agent in the small intestine was assessed at 55.3% and 62.3% for the diatrizoate group and iohexol group, respectively ( P = 0.003). CONCLUSIONS Compared with iohexol, diatrizoate had better image quality, proper fecal-tagging density, and more homogeneous tagging along with comparable excellent patient acceptance, and might be more suitable for fecal tagging in noncathartic computed tomography colonography.
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Affiliation(s)
- Yanshan Chen
- From the Department of Radiology, the Six Affiliated Hospital, Sun Yat-sen University, Guangzhou
| | | | | | - Wenbin Zou
- From the Department of Radiology, the Six Affiliated Hospital, Sun Yat-sen University, Guangzhou
| | - Guibo Luo
- Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA
| | - Guochao Dai
- Department of Radiology, the First People's Hospital of Kashi Area, Kashi
| | - Weidong Zhao
- Department of Radiology, the Second Hospital of Shanxi Medical University, Taiyuan, China
| | - Wenli Cai
- Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA
| | - Mingyue Luo
- From the Department of Radiology, the Six Affiliated Hospital, Sun Yat-sen University, Guangzhou
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Song Y, Hong J, Shao S, Wen J, Zhao X. Effect and mechanism of phosphate enhanced sulfite activation with cobalt ion for effective iohexol abatement. Environ Sci Pollut Res Int 2024; 31:857-870. [PMID: 38032529 DOI: 10.1007/s11356-023-31222-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 11/20/2023] [Indexed: 12/01/2023]
Abstract
Sulfate radical (SO4•-)-based advanced oxidation processes (AOPs) from sulfite activation have recently received attention for abatement of microorganic pollutants in the aquatic environments. Trace-level Co(II) has been demonstrated to be effective for promoting sulfite activation (simplified as the Co(II)/sulfite system) and the corresponding radical formation, yet this process is challenged by the limited valence inter-transformation of Co(II)/Co(III). In order to enhance this valence inter-transformation, a novel Co(II)/HPO42-/sulfite system is developed in this work, because HPO42-, as a typical radical scavenging agent, has the advantage of complexing with Co(II) without quenching effect. In this work, complexation of Co(II) with HPO42- can regulate the electronic structure of Co(II), accelerate electron transfer, and promote valence inter-transformation of Co(II)/Co(III) during the sulfite activation process. The Co(II)/HPO42-/sulfite system exhibits superior iohexol abatement performance under circumneutral conditions. For pH 8.0 and Co(II) dose of 1 μM, the iohexol abatement efficiency is as high as 98%, which is considerably higher than that of the Co(II)/sulfite system (50%). SO4•- is identified as the predominant reactive radical contributing to iohexol abatement. The presence of HPO42- broadens the pH adaptability of the Co(II)/sulfite system for iohexol abatement. In addition, the coexisting Cl- exerts an inhibitory effect on iohexol abatement while the other cations and anions show negligible effect. The Co(II)/HPO42-/sulfite system displays good reusability and adaptability towards various organic pollutants. This study highlights the important role of complexation of Co(II) with HPO42- in sulfite activation and provides a feasible idea for abatement of the microorganic pollutants.
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Affiliation(s)
- Yifan Song
- College of Chemical Engineering, Huaqiao University, Xiamen, 361021, China
| | - Jiesheng Hong
- College of Chemical Engineering, Huaqiao University, Xiamen, 361021, China
| | - Shujing Shao
- College of Chemical Engineering, Huaqiao University, Xiamen, 361021, China
| | - Jiayi Wen
- College of Chemical Engineering, Huaqiao University, Xiamen, 361021, China
| | - Xiaodan Zhao
- College of Chemical Engineering, Huaqiao University, Xiamen, 361021, China.
- Department of Environmental Science & Engineering, Huaqiao University, Xiamen, 361021, Fujian, China.
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Górecka Ż, Idaszek J, Heljak M, Martinez DC, Choińska E, Kulas Z, Święszkowski W. Indocyanine green and iohexol loaded hydroxyapatite in poly(L-lactide-co-caprolactone)-based composite for bimodal near-infrared fluorescence- and X-ray-based imaging. J Biomed Mater Res B Appl Biomater 2024; 112:e35313. [PMID: 37596854 DOI: 10.1002/jbm.b.35313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 07/19/2023] [Accepted: 07/31/2023] [Indexed: 08/20/2023]
Abstract
This study aimed to develop material for multimodal imaging by means of X-ray and near-infrared containing FDA- and EMA-approved iohexol and indocyanine green (ICG). The mentioned contrast agents (CAs) are hydrophilic and amphiphilic, respectively, which creates difficulties in fabrication of functional polymeric composites for fiducial markers (FMs) with usage thereof. Therefore, this study exploited for the first time the possibility of enhancing the radiopacity and introduction of the NIR fluorescence of FMs by adsorption of the CAs on hydroxyapatite (HAp) nanoparticles. The particles were embedded in the poly(L-lactide-co-caprolactone) (P[LAcoCL]) matrix resulting in the composite material for bimodal near-infrared fluorescence- and X-ray-based imaging. The applied method of material preparation provided homogenous distribution of both CAs with high iohexol loading efficiency and improved fluorescence signal due to hindered ICG aggregation. The material possessed profound contrasting properties for both imaging modalities. Its stability was evaluated during in vitro experiments in phosphate-buffered saline (PBS) and foetal bovine serum (FBS) solutions. The addition of HAp nanoparticles had significant effect on the fluorescence signal. The X-ray radiopacity was stable within minimum 11 weeks, even though the addition of ICG contributed to a faster release of iohexol. The stiffness of the material was not affected by iohexol or ICG, but incorporation of HAp nanoparticles elevated the values of bending modulus by approximately 70%. Moreover, the performed cell study revealed that all tested materials were not cytotoxic. Thus, the developed material can be successfully used for fabrication of FMs.
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Affiliation(s)
- Żaneta Górecka
- Division of Materials Design, Faculty of Materials Science and Engineering, Warsaw University of Technology, Warsaw, Poland
- Centre for Advanced Materials and Technologies CEZAMAT, Warsaw University of Technology, Warsaw, Poland
| | - Joanna Idaszek
- Division of Materials Design, Faculty of Materials Science and Engineering, Warsaw University of Technology, Warsaw, Poland
| | - Marcin Heljak
- Division of Materials Design, Faculty of Materials Science and Engineering, Warsaw University of Technology, Warsaw, Poland
| | - Diana C Martinez
- Division of Materials Design, Faculty of Materials Science and Engineering, Warsaw University of Technology, Warsaw, Poland
| | - Emilia Choińska
- Division of Materials Design, Faculty of Materials Science and Engineering, Warsaw University of Technology, Warsaw, Poland
| | - Zbigniew Kulas
- Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Wroclaw, Poland
| | - Wojciech Święszkowski
- Division of Materials Design, Faculty of Materials Science and Engineering, Warsaw University of Technology, Warsaw, Poland
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Luiskari L, Launonen H, Lindén J, Lehto M, Vapaatalo H, Salmenkari H, Korpela R. Ketogenic Diet High in Saturated Fat Promotes Colonic Claudin Expression without Changes in Intestinal Permeability to Iohexol in Healthy Mice. Nutrients 2023; 16:18. [PMID: 38201850 PMCID: PMC10780785 DOI: 10.3390/nu16010018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 12/11/2023] [Accepted: 12/16/2023] [Indexed: 01/12/2024] Open
Abstract
Ketogenic diets (KDs) have been studied in preclinical models of intestinal diseases. However, little is known of how the fat source of these diets influences the intestinal barrier. Herein, we studied the impact of four-week feeding with KD high either in saturated fatty acids (SFA-KD) or polyunsaturated linoleic acid (LA-KD) on paracellular permeability of the intestine to iohexol in healthy male C57BL/6J mice. We investigated jejunal and colonic tight junction protein expression, histological changes, and inflammatory markers (Il1b, Il6, Tnf, and Lcn2), as well as the activity and expression of intestinal alkaline phosphatase (IAP) in feces and jejunal tissue, respectively, and plasma lipopolysaccharide. KDs did not change intestinal permeability to iohexol after two or twenty-six days of feeding regardless of fat quality. SFA-KD, but not LA-KD, upregulated the colonic expression of tight junction proteins claudin-1 and -4, as well as the activity of IAP. Both KDs resulted in increased epithelial vacuolation in jejunum, and this was pronounced in SFA-KD. Jejunal Il1β expression was lower and colonic Il6 expression higher in LA-KD compared to SFA-KD. In colon, Tnf mRNA was increased in LA-KD when compared to controls. Overall, the results suggest that KDs do not influence intestinal permeability to iohexol but elicit changes in colonic tight junction proteins and inflammatory markers in both jejunum and colon. Future research will show whether these changes become of importance upon proinflammatory insults.
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Affiliation(s)
- Lotta Luiskari
- Department of Pharmacology, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland; (H.L.); (H.V.)
- Human Microbiome Research Program, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland
| | - Hanna Launonen
- Department of Pharmacology, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland; (H.L.); (H.V.)
| | - Jere Lindén
- Department of Veterinary Biosciences, Faculty of Veterinary Medicine, University of Helsinki, 00014 Helsinki, Finland;
- Finnish Centre for Laboratory Animal Pathology, Helsinki Institute of Life Science, University of Helsinki, 00014 Helsinki, Finland
| | - Markku Lehto
- Folkhälsan Institute of Genetics, Folkhälsan Research Center, 00290 Helsinki, Finland; (M.L.); (H.S.)
- Department of Nephrology, University of Helsinki and Helsinki University Hospital, 00290 Helsinki, Finland
- Research Program for Clinical and Molecular Metabolism, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland
| | - Heikki Vapaatalo
- Department of Pharmacology, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland; (H.L.); (H.V.)
| | - Hanne Salmenkari
- Folkhälsan Institute of Genetics, Folkhälsan Research Center, 00290 Helsinki, Finland; (M.L.); (H.S.)
- Department of Nephrology, University of Helsinki and Helsinki University Hospital, 00290 Helsinki, Finland
- Research Program for Clinical and Molecular Metabolism, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland
| | - Riitta Korpela
- Department of Pharmacology, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland; (H.L.); (H.V.)
- Human Microbiome Research Program, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland
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10
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Kang MS, Chang MC, Kwak S. Usefulness of barium sulfate and iohexol as contrast agents for VFSS in visualizing components of swallowing predictable of poor outcomes. Sci Rep 2023; 13:21556. [PMID: 38057481 PMCID: PMC10700337 DOI: 10.1038/s41598-023-46297-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Accepted: 10/30/2023] [Indexed: 12/08/2023] Open
Abstract
Barium sulfate and iohexol are commonly used as contrast agents for videofluoroscopic swallowing study (VFSS). This study compared their usefulness as contrast agents in visualizing components of swallowing predictable of subsequent pneumonia and unintentional weight loss after VFSS. This was a randomized, controlled, crossover trial. The two contrast agents were alternately used in the same participants, and the order in which the contrast agent was tested first was randomly assigned. After VFSS, we followed the participants for 3 months and the association between VFSS findings of each contrast agent and the subsequent pneumonia and unintentional weight loss were analyzed. A total of 30 participants were included in the analysis. We recorded 11 cases of subsequent pneumonia and 13 of unintentional weight loss. Regarding the risk of subsequent pneumonia after VFSS, only the oral transit time and number of swallows tested with barium sulfate indicated significant differences between participants with and without subsequent pneumonia. For unintentional weight loss, oral transit time and pharyngeal wall coating after swallowing tested with barium sulfate, as well as oral transit time, nasal penetration, residue in the valleculae, PAS scores, and number of swallows when testing with iohexol demonstrated significant differences between those with and without unintentional weight loss.
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Affiliation(s)
- Min Soo Kang
- Department of Physical Medicine & Rehabilitation, College of Medicine, Yeungnam University, Daegu, South Korea
| | - Min Cheol Chang
- Department of Physical Medicine & Rehabilitation, College of Medicine, Yeungnam University, Daegu, South Korea
| | - Soyoung Kwak
- Department of Physical Medicine & Rehabilitation, College of Medicine, Yeungnam University, Daegu, South Korea.
- Department of Physical Medicine & Rehabilitation, Yeungnam University Hospital, 170, Hyeonchung-ro, Nam-gu, Daegu, 42415, South Korea.
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11
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Stehlé T, Wei F, Brabant S, Luciani A, Grimbert P, Prié D, Reizine E, Durrbach A, Mulé S, Hulin A, Boueilh A, Blain M, Champy CM, Ingels A, Matignon M, Brasseur P, Canouï-Poitrine F, Pigneur F. Glomerular Filtration Rate Measured Based on Iomeprol Clearance Assessed at CT Urography in Living Kidney Donor Candidates. Radiology 2023; 309:e230567. [PMID: 38085083 DOI: 10.1148/radiol.230567] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2023]
Abstract
Background Estimating glomerular filtration rate (GFR) from serum creatinine can be inaccurate, and current procedures for measuring GFR are time-consuming and cumbersome. Purpose To develop a method for measuring GFR based on iomeprol clearance assessed at CT urography in kidney donor candidates and compare this with iohexol clearance (reference standard for measuring GFR). Materials and Methods This cross-sectional retrospective study included data from kidney donor candidates who underwent both iohexol clearance and CT urography between July 2016 and October 2022. CT-measured GFR was calculated as the iomeprol excretion rate in the urinary system between arterial and excretory phases (Hounsfield units times milliliters per minute) divided by a surrogate for serum iomeprol concentration in the aorta at the midpoint (in Hounsfield units). Performance of CT-measured GFR was assessed with use of mean bias (mean difference between CT-measured GFR and iohexol clearance), precision (the distance between quartile 1 and quartile 3 of the bias [quartile 3 minus quartile 1], with a small value indicating high precision), and accuracy (percentage of CT-measured GFR values falling within 10%, 20%, and 30% of iohexol clearance values). Intraobserver agreement was assessed for 30 randomly selected individuals with the Lin concordance correlation coefficient. Results A total of 75 kidney donor candidates were included (mean age, 51 years ± 13 [SD]; 45 female). The CT-measured GFR was unbiased (1.1 mL/min/1.73 m2 [95% CI: -1.9, 4.1]) and highly precise (16.2 mL/min/1.73 m2 [quartiles 1 to 3, -6.6 to 9.6]). The accuracy of CT-measured GFR within 10%, 20%, and 30% was 61.3% (95% CI: 50.3, 72.4), 88.0% (95% CI: 80.7, 95.4), and 100%, respectively. Concordance between CT-based GFR measurements taken 2 months apart was almost perfect (correlation coefficient, 0.99 [95% CI: 0.98, 0.99]). Conclusion In living kidney donors, GFR measured based on iomeprol clearance assessed at CT urography showed good agreement with GFR measured based on iohexol clearance. © RSNA, 2023 Supplemental material is available for this article. See also the editorial by Davenport in this issue.
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Affiliation(s)
- Thomas Stehlé
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
| | - Félix Wei
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
| | - Séverine Brabant
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
| | - Alain Luciani
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
| | - Philippe Grimbert
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
| | - Dominique Prié
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
| | - Edouard Reizine
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
| | - Antoine Durrbach
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
| | - Sébastien Mulé
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
| | - Anne Hulin
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
| | - Anna Boueilh
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
| | - Maxime Blain
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
| | - Cécile-Maud Champy
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
| | - Alexandre Ingels
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
| | - Marie Matignon
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
| | - Paul Brasseur
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
| | - Florence Canouï-Poitrine
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
| | - Frédéric Pigneur
- From the Institut National de la Santé et de la Recherche Médicale (INSERM) U955, Université Paris Est Créteil, Institut Mondor de Recherche Biomédicale, Créteil, France (T.S., F.W., A.L., P.G., E.R., S.M., A.H., A.B., M.B., C.M.C., A.I., M.M., P.B., F.C.P., F.P.); Service de Néphrologie et Transplantation (T.S., P.G., A.D., A.B., M.M.), Fédération Hospitalo-Universitaire Innovative Therapy for Immune Disorders (T.S., P.G., A.D., A.B., M.M.), Service d'Imagerie Médicale (F.W., A.L., E.R., S.M., M.B., F.P.), Laboratoire de Pharmacologie (A.H.), Service d'Urologie (C.M.C., A.I.), Service de Santé Publique (P.B., F.C.P.), and Unité de Recherche Clinique (P.B., F.C.P.), Assistance Publique des Hôpitaux de Paris (AP-HP), Hôpitaux Universitaires Henri-Mondor, Créteil, France; Service de Physiologie et Explorations Fonctionnelles, AP-HP, Groupe Hospitalier Necker Enfants Malades, Paris, France (S.B., D.P.); Faculté de Médecine, Université de Paris Cité, INSERM U1151, Paris, France (D.P.); Faculté de Médecine, Université Paris-Saclay, Orsay, France (A.D.); and INSERM UMR 1186, Institut Gustave Roussy, Villejuif, France (A.D.)
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12
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He J, Li M, Xu Y, Fan N, Tian C, Lv T, Xing W, Yu H. In vitro characteristics of Epirubicin-loaded thermosensitive liquid embolic agent. J Cancer Res Ther 2023; 19:1597-1602. [PMID: 38156927 DOI: 10.4103/jcrt.jcrt_334_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 08/01/2023] [Indexed: 01/03/2024]
Abstract
OBJECTIVE To investigate the drug loading and release rate of epirubicin-loaded thermosensitive liquid embolic agents in vitro. MATERIALS AND METHODS The drug loading and stability of epirubicin-loaded thermosensitive liquid embolic agents with or without iopromide were determined by high-performance liquid chromatography, and the same method was used to determine the drug release rate of thermosensitive liquid embolic agents at different time points. RESULTS For epirubicin-loaded thermosensitive liquid embolic agents without iopromide, the average drug loading after filtration by membrane was (0.78 ± 0.02) mg and the drug loading rate was (16.1 ± 0.35)%, while the average drug loading without membrane was (0.73 ± 0.06) mg and the drug loading rate was (15.07 ± 1.17)%. After adding iopromide, the drug loading capacity was measured from 0 h-24 h solution and the drug loading was calculated indirectly and conclude that the drug loading capacity of thermosensitive liquid embolic agents decreased or disappeared. The sustained release rate of epirubicin from 0 to 48 hours was 42.65% in 48 hours. CONCLUSION Epirubicin can be successfully loaded into the thermosensitive liquid embolic agents with good stability and sustained release. After adding iopromide, the drug loading capacity of thermosensitive liquid embolic agents decreased or disappeared.
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Affiliation(s)
- Ji'an He
- Department of Interventional Therapy, Tianjin Medical University Institute and Hospital, National Clinical Research Center for Cancer, Tianjin's Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin, China
- Department of General Surgery, Tianjin Beichen Traditional Chinese Medicine Hospital, Tianjin, China
| | - Mei Li
- Department of Interventional Therapy, Tianjin Medical University Institute and Hospital, National Clinical Research Center for Cancer, Tianjin's Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin, China
| | - Yan Xu
- Department of Interventional Therapy, Tianjin Medical University Institute and Hospital, National Clinical Research Center for Cancer, Tianjin's Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin, China
| | - Ning Fan
- Department of Interventional Therapy, Tianjin Medical University Institute and Hospital, National Clinical Research Center for Cancer, Tianjin's Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin, China
- Department of General Surgery, Tianjin Beichen Traditional Chinese Medicine Hospital, Tianjin, China
| | - Chong Tian
- Department of Interventional Therapy, Tianjin Medical University Institute and Hospital, National Clinical Research Center for Cancer, Tianjin's Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin, China
- Department of Oncology, Tianjin Beichen Hospital, Tianjin, China
| | - Tianye Lv
- Department of Interventional Therapy, Tianjin Medical University Institute and Hospital, National Clinical Research Center for Cancer, Tianjin's Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin, China
- Department of Oncology, The 983 Hospital of Joint Logistics Support Force of PLA, Tianjin, China
| | - Wenge Xing
- Department of Interventional Therapy, Tianjin Medical University Institute and Hospital, National Clinical Research Center for Cancer, Tianjin's Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin, China
| | - Haipeng Yu
- Department of Interventional Therapy, Tianjin Medical University Institute and Hospital, National Clinical Research Center for Cancer, Tianjin's Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin, China
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Tomasino AM, Olson JD, Schaaf GW, Cox AO, Furdui CM, Cline JM, Cohen EP. A New Method for Estimating Glomerular Filtration Rate in Rhesus Macaques (Macaca mulatta). Radiat Res 2023; 200:548-555. [PMID: 37902230 DOI: 10.1667/rade-23-00062.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 10/14/2023] [Indexed: 10/31/2023]
Abstract
Late effects of total- or partial-body irradiation include chronic kidney injury (CKI), which increases morbidity and mortality. Glomerular filtration rate (GFR) is the gold standard measure of kidney function. Renal function markers, such as blood urea nitrogen (BUN) and serum creatinine (Cr), may not be higher than reference ranges until 50% or more of nephrons are affected. Currently available methods to measure GFR are difficult and expensive, requiring multiple blood draws or timed urine collections, but their use can provide a framework for the development of simpler GFR estimates. The measurement of iohexol clearance is a validated tool used to determine GFR in veterinary patients. In this study, we aimed to determine if the Schwartz formula as used in human pediatric medicine can estimate GFR in rhesus macaques. We hypothesized that iohexol-GFR would correlate with the Schwartz formula-estimated GFR (eGFR) in irradiated and non-irradiated rhesus macaques. Twelve rhesus macaques [age 5-14 years (mean 7 years); 5 females, 7 males] with a range of BUN levels were selected for comparison to 4 non-irradiated controls (2 females, 2 males). Irradiated animals were divided by BUN into 3 groups: BUN ≤20 mg/dL (n = 4), BUN >20-24 mg/dL (n = 4), and BUN ≥25 mg/dL (n = 4). Baseline serum chemistry and urinalysis were used to assess renal function. For measurement of GFR, macaques were maintained under general anesthesia and received an intravenous injection of iohexol (2 mL/kg, 300 mg I/mL). Whole blood was collected at 10, 30, 60 and 90 min post-iohexol injection. Plasma iohexol concentrations were determined by mass spectrometry. GFR was calculated from the peak iohexol concentration and trapezoidal area under the curve (tAUC). The iohexol-GFR significantly correlated with the Schwartz formula-eGFR. In macaques with renal irradiation doses below 6 Gy, GFR was higher for males than females. GFR was lower in macaques with renal irradiation doses greater than 6 Gy compared to macaques with renal doses less than 6 Gy. We conclude that use of the Schwartz formula can provide a rapid, non-invasive, cost-effective, and accurate estimation of GFR to aid in the clinical assessment of renal function in irradiated rhesus macaques.
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Affiliation(s)
- Allison M Tomasino
- Section on Comparative Medicine, Department of Pathology, Wake Forest University School of Medicine, Winston-Salem, North Carolina
- Animal Resources Department and
| | - John D Olson
- Section on Comparative Medicine, Department of Pathology, Wake Forest University School of Medicine, Winston-Salem, North Carolina
- Animal Resources Department and
| | - George W Schaaf
- Section on Comparative Medicine, Department of Pathology, Wake Forest University School of Medicine, Winston-Salem, North Carolina
- Animal Resources Department and
| | - Anderson O Cox
- Proteomics and Metabolomics Shared Resource, Atrium Health Wake Forest Baptist, Winston-Salem, North Carolina
| | - Cristina M Furdui
- Proteomics and Metabolomics Shared Resource, Atrium Health Wake Forest Baptist, Winston-Salem, North Carolina
- Section on Molecular Medicine, Department of Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina
| | - J Mark Cline
- Section on Comparative Medicine, Department of Pathology, Wake Forest University School of Medicine, Winston-Salem, North Carolina
- Animal Resources Department and
| | - Eric P Cohen
- Nephrology Division, Department of Medicine, NYU School of Medicine, New York, New York
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McDermott MC, Hendriks BM, Wildberger JE, de Boer SW. Shaken or Stirred? The Inconsistencies of Manual Contrast Media Dilution in Endovascular Interventions. Invest Radiol 2023; 58:811-815. [PMID: 37289302 PMCID: PMC10581416 DOI: 10.1097/rli.0000000000000994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Accepted: 04/24/2023] [Indexed: 06/09/2023]
Abstract
MATERIALS AND METHODS Phase I: Eleven radiological technologists were asked to fill a CM injector 3 times with 50% diluted CM (iopromide 300 mg I/mL). The dilution was injected (12 mL/s) through a Coriolis flowmeter, with CM concentration and total volume calculated. Interoperator, intraoperator, and intraprocedural variations were calculated as coefficients of variability. Contrast media dose reporting accuracy was determined. Phase II: The study was repeated after implementation of a standardized dilution protocol with 5 representative operators. RESULTS Phase I: The average injected concentration among 11 operators was 68% ± 16% CM (n = 33; range, 43%-98%), as compared with the target of 50% CM. The interoperator variability was 16%, the intraoperator variability was 6% ± 3%, and the intraprocedural variability was 23% ± 19% (range, 5%-67%). This led to overdelivery of CM compared with intended patient dose by 36% on average. Phase II: After standardization, injections averaged 55% ± 4% CM (n = 15; range, 49%-62%), with interoperator variability of 8%, intraoperator variability of 5% ± 1%, and intraprocedural variability of 1.6% ± 0.5% (range, 0.4%-3.7%). CONCLUSIONS Manual CM dilution can lead to substantial interoperator and intraoperator, as well as intraprocedural variability in injected concentration. This can result in underreporting of administered CM doses to patients. It is recommended that clinics assess their current standard of care regarding CM injections for endovascular interventions and evaluate potential corrective actions if appropriate.
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Mehta A, Roa JA, Cannavale K, Sur S, Singh IP. Differences in radiopacity among CT contrast agents and concentrations: A quantitative study. J Neuroimaging 2023; 33:909-916. [PMID: 37626255 DOI: 10.1111/jon.13149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 08/14/2023] [Accepted: 08/15/2023] [Indexed: 08/27/2023] Open
Abstract
BACKGROUND AND PURPOSE Several studies in the literature have attempted to subjectively assess the degree of visualization of different neurovascular structures using different contrast agents and concentrations. Given the recent contrast shortages, we aim to objectively compare the radiopacity achieved with four angiographic contrast agents used in clinical practice. METHODS Isovue 370, Visipaque 320, Omnipaque 300, and Isovue 300 were each drawn up at 25%, 50%, 75%, and 100% concentrations and compared against normal saline and air syringes. CT scans were obtained, and regions of interest were analyzed for radiopacity using Hounsfield unit (HU) measurements. An aneurysm model with different contrast concentrations was also scanned and dimensions compared. Two-tailed t-tests and Cohen's d coefficients were applied to assess for differences in mean HU measurements. RESULTS Isovue 370 and Isovue 300 had the highest and lowest mean HU, respectively (p < .001). Visipaque 320 at 25% concentration had the lowest mean HU at -.76. Statistically similar agents (p < .05) were Visipaque 320 and Omnipaque 300 at a 100% concentration (p = .30), and Omnipaque 300 and Isovue 300 at a 25% concentration (p = .73). Aneurysm dimensions among Isovue 370, Visipaque 320, and Omnipaque 300 were all similar, whereas with Isovue 300, the dimensions were significantly smaller (p < .05). CONCLUSION Isovue 370 provides the highest HU radiopacity and the most accurate aneurysm measurements. Angiographic measurements obtained with Isovue 300 may underestimate the actual aneurysmal dimensions. Visipaque 320 and Omnipaque 300 at 100% concentration have similar mean HUs and are beneficial for patients with chronic kidney or cardiac disease.
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Affiliation(s)
- Amit Mehta
- Department of Neurology, MedStar Georgetown University Hospital, Washington, District of Columbia, USA
| | - Jorge A Roa
- Department of Neuroendovascular Surgery, MedStar Franklin Square Hospital, Baltimore, Maryland, USA
| | - Kelly Cannavale
- Department of Neuroendovascular Surgery, MedStar Franklin Square Hospital, Baltimore, Maryland, USA
| | - Samir Sur
- Department of Neuroendovascular Surgery, MedStar Franklin Square Hospital, Baltimore, Maryland, USA
| | - I Paul Singh
- Department of Neurology, MedStar Georgetown University Hospital, Washington, District of Columbia, USA
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Ren L, Sun Y, Yeh B, Marsh JF, Winfree TN, Burke KA, Rajendran K, McCollough CH, Mileto A, Fletcher JG, Leng S. Characterization of single- and multi-energy CT performance of an oral dark borosilicate contrast media using a clinical photon-counting-detector CT platform. Med Phys 2023; 50:6779-6788. [PMID: 37669507 PMCID: PMC10840945 DOI: 10.1002/mp.16713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 08/16/2023] [Accepted: 08/16/2023] [Indexed: 09/07/2023] Open
Abstract
BACKGROUND The feasibility of oral dark contrast media is under exploration in abdominal computed tomography (CT) applications. One of the experimental contrast media in this class is dark borosilicate contrast media (DBCM), which has a CT attenuation lower than that of intra-abdominal fat. PURPOSE To evaluate the performances of DBCM using single- and multi-energy CT imaging on a clinical photon-counting-detector CT (PCD-CT). METHODS Five vials, three with iodinated contrast agent (5, 10, and 20 mg/mL; Omnipaque 350) and two with DBCM (6% and 12%; Nextrast, Inc.), and one solid-water rod (neutral contrast agent) were inserted into two multi-energy CT phantoms, and scanned on a clinical PCD-CT system (NAEOTOM Alpha) at 90, 120, 140, Sn100, and Sn140 kV (Sn: tin filter) in multi-energy mode. CARE keV IQ level was 180 (CTDIvol: 3.0 and 12.0 mGy for the small and large phantoms, respectively). Low-energy threshold images were reconstructed with a quantitative kernel (Qr40, iterative reconstruction strength 2) and slice thickness/increment of 2.0/2.0 mm. Virtual monoenergetic images (VMIs) were reconstructed from 40 to 140 keV at 10 keV increments. On all images, average CT numbers for each vial/rod were measured using circular region-of-interests and averaged over eight slices. The contrast-to-noise ratio (CNR) of iodine (5 mg/mL) against DBCM was calculated and plotted against tube potential and VMI energy level, and compared to the CNR of iodine against water. Similar analyses were performed on iodine maps and VNC images derived from the multi-energy scan at 120 kV. RESULTS With increasing kV or VMI keV, the negative HU of DBCM decreased only slightly, whereas the positive HU of iodine decreased across all contrast concentrations and phantom sizes. CT numbers for DBCM decreased from -178.5 ± 9.6 to -194.4 ± 6.3 HU (small phantom) and from -181.7 ± 15.7 to -192.1 ± 11.9 HU (large phantom) for DBCM-12% from 90 to Sn140 kV; on VMIs, the CT numbers for DBCM decreased minimally from -147.1 ± 15.7 to -185.1 ± 9.2 HU (small phantom) and -158.8 ± 28.6 to -188.9 ± 14.7 HU (large phantom) from 40 to 70 keV, but remained stable from 80 to 140 keV. The highest iodine CNR against DBCM in low-energy threshold images was seen at 90 or Sn140 kV for the small phantom, whereas all CNR values from low-energy threshold images for the large phantom were comparable. The CNR values of iodine against DBCM computed on VMIs were highest at 40 or 70 keV depending on iodine and DBCM concentrations. The CNR values of iodine against DBCM were consistently higher than iodine to water (up to 460% higher dependent on energy level). Further, the CNR of iodine compared to DBCM is less affected by VMI energy level than the identical comparison between iodine and water: CNR values at 140 keV were reduced by 46.6% (small phantom) or 42.6% (large phantom) compared to 40 keV; CNR values for iodine compared to water were reduced by 86.3% and 83.8% for similar phantom sizes, respectively. Compared to 70 keV VMI, the iodine CNR against DBCM was 13%-79% lower on iodine maps and VNC. CONCLUSIONS When evaluated at different tube potentials and VMI energy levels using a clinical PCD-CT system, DBCM showed consistently higher CNR compared to iodine versus water (a neutral contrast).
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Affiliation(s)
- Liqiang Ren
- Department of Radiology, Mayo Clinic, Rochester, MN, US
| | - Yuxin Sun
- NEXTRAST, INC., Hillsborough, CA, US
| | | | | | | | | | | | | | - Achille Mileto
- Department of Radiology, Virginia Mason Medical Center, Seattle, WA, US
| | | | - Shuai Leng
- Department of Radiology, Mayo Clinic, Rochester, MN, US
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Fan YH, Lu YW, Hayat F, Mei YH, Chen M. Overcoming slow removal efficiency-induced highly toxic I-DBPs in water by oxygen vacancies enriched invasive plant biochar catalyst: Experimental and theoretical studies. J Hazard Mater 2023; 459:132086. [PMID: 37480607 DOI: 10.1016/j.jhazmat.2023.132086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Revised: 07/10/2023] [Accepted: 07/17/2023] [Indexed: 07/24/2023]
Abstract
Developing effective and safe catalysts operated in the in-depth removal of iodinated X-ray contrast media is important for overcoming slow removal efficiency-induced highly toxic iodine-replaced disinfection byproducts (I-DBPs). In this study, a novel oxygen vacancies enriched heterogeneous biochar catalyst (Mo-Co-ECM) from the invasive plant was synthesized by a facile one-step hydrothermal carbonization method and used for the in-depth removal of iohexol (IOH) by the activation of peroxymonosulfate (PMS). The results indicated that after adding PMS for 3 min, the removal efficiency of IOH in Mo-Co-ECM/PMS system reached 100% and exhibited a superior degradation efficiency compared to Co-ECM/PMS and ECM/PMS system. Only nine I-DBPs were found during the degradation, which were dominated by small molecules compounds (MW<400). The in-depth degradation suppresses the formation of the toxic intermediates. The density functional theory and electron spin resonance showed that due to the existence of Mo and oxygen vacancies, the electron transfer ability was improved, which accelerated the cycle of Co3+/Co2+, so as to enhance the catalytic activity of Mo-Co-ECM/PMS system. This study is expected to provide a general way for decreasing the production of toxic intermediates during the advanced oxidation of contaminants, meanwhile recovering resources.
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Affiliation(s)
- Yu-Han Fan
- Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China
| | - Yu-Wei Lu
- Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China; College of Resources and Environment, Yangtze University, Wuhan 430100, China
| | - Faisal Hayat
- Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China
| | - Yu-Han Mei
- Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China
| | - Ming Chen
- Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China.
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18
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Dong Q, Fuhr U, Schaeffner E, van der Giet M, Ebert N, Taubert M. Improved correction formulas to estimate iohexol clearance from simple models. Eur J Clin Pharmacol 2023; 79:1215-1217. [PMID: 37422532 PMCID: PMC10427699 DOI: 10.1007/s00228-023-03535-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 06/27/2023] [Indexed: 07/10/2023]
Affiliation(s)
- Qian Dong
- Department I of Pharmacology, Center for Pharmacology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Gleueler Straße 24, Cologne, 50931, Germany.
| | - Uwe Fuhr
- Department I of Pharmacology, Center for Pharmacology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Gleueler Straße 24, Cologne, 50931, Germany
| | - Elke Schaeffner
- Institute of Public Health, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - Markus van der Giet
- Department of Nephrology, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - Natalie Ebert
- Institute of Public Health, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - Max Taubert
- Department I of Pharmacology, Center for Pharmacology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Gleueler Straße 24, Cologne, 50931, Germany
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McGilloway M, Manley S, Aho A, Heeringa KN, Lou Y, Squires EJ, Pearson W. The combination of trailer transport and exercise increases gastrointestinal permeability and markers of systemic inflammation in horses. Equine Vet J 2023; 55:853-861. [PMID: 36210653 DOI: 10.1111/evj.13888] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 09/23/2022] [Indexed: 11/28/2022]
Abstract
BACKGROUND Leaky gut syndrome (LGS) is an idiopathic disorder characterised by alterations in intestinal permeability and low-grade systemic inflammation. Factors contributing to development of LGS are not well-understood but physiological stressors such as exercise and transport may play a role which may be of pathophysiological relevance in horses. OBJECTIVES To characterise the combined effect of transport stress and exercise on gastrointestinal permeability, and to determine whether these effects are associated with increased inflammatory biomarkers in plasma. STUDY DESIGN Controlled, randomised and cross-over study. METHODS Horses (n = 8 per group) were given a gastrointestinal permeability tracer (iohexol; 5.6% solution; 1 ml/kg bwt) via nasogastric entubation prior to being assigned to a stressed (EX; 1 h of trailer transport immediately followed by 30 min moderate intensity exercise; n = 4) or sedentary control (CON; n = 4) group. Plasma samples were obtained prior to iohexol administration (P1), after transport (P2), at exercise cessation (P3), and at 1 (P4), 2 (P5), 4 (P6) and 8 (P7) hours after cessation of exercise and were analysed for iohexol, inflammatory biomarkers (SAA, LPS, IFABP and LBP) and tight junction proteins (zonulin). Faecal samples were collected at times corresponding to before and after stress from both groups and analysed for zonulin. Data were analysed using a 2-way RM ANOVA. RESULTS In EX horses, a significant increase in iohexol was observed at P2 (1.5 ± 0.24 μg/ml; p = 0.03), P3 (2.1 ± 0.29 μg/ml; p < 0.001), P4 (2.1 ± 0.17 μg/ml; p < 0.001) compared with P1 (0.7 ± 0.21 μg/ml); iohexol was significantly higher in EX than CON horses at P3 (p < 0.001), P4 (p < 0.001) and P5 (p = 0.003). LPS and SAA were significantly higher in EX than CON at P4 (p < 0.001) and P6 (p = 0.04), respectively. MAIN LIMITATIONS Data from our small sample size may not be generalisable to the larger equine population. CONCLUSIONS Combined transport and exercise increases gastrointestinal permeability and systemic SAA and LPS. The model described herein may be useful in further studies on the role of alterations in gastrointestinal permeability in equine disease.
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Affiliation(s)
- Melissa McGilloway
- Department of Animal Biosciences, University of Guelph, Guelph, Ontario, Canada
| | - Shannon Manley
- Department of Animal Biosciences, University of Guelph, Guelph, Ontario, Canada
| | - Alyssa Aho
- Department of Animal Biosciences, University of Guelph, Guelph, Ontario, Canada
| | - Keisha N Heeringa
- Department of Animal Biosciences, University of Guelph, Guelph, Ontario, Canada
| | - Yanping Lou
- Department of Animal Biosciences, University of Guelph, Guelph, Ontario, Canada
| | - Eli James Squires
- Department of Animal Biosciences, University of Guelph, Guelph, Ontario, Canada
| | - Wendy Pearson
- Department of Animal Biosciences, University of Guelph, Guelph, Ontario, Canada
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Ogawa M, Nohara H, Hsu HH, Ishizaka M, Miyagawa Y, Takemura N. Association between glomerular filtration rate and plasma N-terminal pro-atrial natriuretic peptide concentration in dogs. J Small Anim Pract 2023; 64:568-573. [PMID: 37345758 DOI: 10.1111/jsap.13626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2022] [Revised: 03/16/2023] [Accepted: 04/21/2023] [Indexed: 06/23/2023]
Abstract
OBJECTIVES To investigate the association between plasma N-terminal pro-atrial natriuretic peptide concentration and glomerular filtration rate in dogs. MATERIALS AND METHODS Dogs were classified into four categories by bodyweight. Dogs were divided into four groups (Groups 1 to 4) based on glomerular filtration rate estimates using plasma iohexol clearance per bodyweight category. Generalised linear models were built to explore the relationship between plasma N-terminal pro-atrial natriuretic peptide concentration and glomerular filtration rate and the effect of confounders on plasma N-terminal pro-atrial natriuretic peptide concentration. RESULTS Fifty-three dogs were included (Group 1, 25; Group 2, seven; Group 3, five; and Group 4, 16). The medians (interquartile range) N-terminal pro-atrial natriuretic peptide concentrations for Groups 1 to 4 were 7224 pg/mL (4766 to 10,254 mg/dL), 8958 pg/mL (4935 to 11,271 mg/dL), 9280 pg/mL (9195 to 10,384 mg/dL) and 12,683 pg/mL (9133 to 19,217 mg/dL), respectively. Group 4, estimated to have the highest reduction in glomerular filtration rate, had a higher plasma N-terminal pro-atrial natriuretic peptide concentration than Groups 1 to 3. Based on the final generalised linear model, influencing factors for plasma N-terminal pro-atrial natriuretic peptide concentration were plasma iohexol clearance (-0.136; 95% confidence interval, -0.227 to -0.046) and bodyweight (-0.058; 95% confidence interval, -0.098 to -0.018). CLINICAL SIGNIFICANCE N-terminal pro-atrial natriuretic peptide concentration is associated with the glomerular filtration rate.
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Affiliation(s)
- M Ogawa
- Laboratory of Veterinary Internal Medicine II, School of Veterinary Medicine, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino-shi, Tokyo, 180-8602, Japan
| | - H Nohara
- Laboratory of Veterinary Internal Medicine II, School of Veterinary Medicine, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino-shi, Tokyo, 180-8602, Japan
| | - H H Hsu
- Laboratory of Veterinary Internal Medicine II, School of Veterinary Medicine, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino-shi, Tokyo, 180-8602, Japan
| | - M Ishizaka
- Laboratory of Veterinary Internal Medicine II, School of Veterinary Medicine, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino-shi, Tokyo, 180-8602, Japan
| | - Y Miyagawa
- Laboratory of Veterinary Internal Medicine II, School of Veterinary Medicine, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino-shi, Tokyo, 180-8602, Japan
| | - N Takemura
- Laboratory of Veterinary Internal Medicine II, School of Veterinary Medicine, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino-shi, Tokyo, 180-8602, Japan
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21
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Almallouhi E, Sattur M, Lajthia O, Kicielinski KP, Holmstedt C, Lena JR, Al Kasab S, Spiotta AM. Contrast conservation measures during the global iohexol contrast shortage crisis did not affect stroke thrombectomy outcomes. J Neurointerv Surg 2023; 15:e76-e78. [PMID: 35882555 DOI: 10.1136/jnis-2022-019210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 06/29/2022] [Indexed: 11/04/2022]
Abstract
BACKGROUND The current global shortage in iohexol contrast material (Omnipaque) used in performing CT-based triage images and mechanical thrombectomy (MT) represents a challenge to the healthcare system. A study was undertaken to assess the safety and feasibility of implementing protocol-based changes in pre-MT and MT workflow at a comprehensive stroke center. METHODS A retrospective cohort study was undertaken of all patients with stroke who underwent MT during a 3-week period before implementing the contrast shortage protocol and for 3 weeks while implementing the protocol. The contrast shortage protocol included not performing perfusion images for MT selection and using diluted iohexol (50% contrast mixed with 50% heparinized saline) during the MT procedure. Procedural variables were compared between the two groups. RESULTS A total of 27 patients underwent MT during the study period, 12 pre-contrast shortage and 15 post-contrast shortage. The average contrast volume used during the MT procedure was reduced from 83 mL to 68 mL after implementing the contrast shortage protocol (p=0.04). No difference was noted in the rate of successful reperfusion (11/15 vs 10/12), average time to recanalization (21 vs 23 min), average radiation dose (1143 vs 1117mGy) and time under fluoroscopy (20.7 vs 20.5 min) in the pre- and post-contrast shortage groups. A favorable discharge outcome was observed in 3/12 patients and 4/15 patients in the pre- and post-shortage periods, respectively (p=0.92). CONCLUSIONS Modifying stroke workflow to adapt to the current global shortage in iohexol is feasible. Using diluted iohexol (50% contrast mixed with 50% heparinized saline) did not affect MT outcomes.
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Affiliation(s)
- Eyad Almallouhi
- Department of Neurosurgery, Medical University of South Carolina, Charleston, South Carolina, USA
- Department of Neurology, Medical University of South Carolina, Charleston, SC, USA
| | - Mithun Sattur
- Department of Neurosurgery, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Orgest Lajthia
- Department of Neurosurgery, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Kimberly P Kicielinski
- Department of Neurosurgery, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Christine Holmstedt
- Department of Neurology, Medical University of South Carolina, Charleston, SC, USA
| | - Jonathan R Lena
- Department of Neurosurgery, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Sami Al Kasab
- Department of Neurosurgery, Medical University of South Carolina, Charleston, South Carolina, USA
- Department of Neurology, Medical University of South Carolina, Charleston, SC, USA
| | - Alejandro M Spiotta
- Department of Neurosurgery, Medical University of South Carolina, Charleston, South Carolina, USA
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22
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Eriksen BO, Fasiolo M, Mathisen UD, Jenssen TG, Stefansson VTN, Melsom T. Ambulatory blood pressure as risk factor for long-term kidney function decline in the general population: a distributional regression approach. Sci Rep 2023; 13:14296. [PMID: 37652955 PMCID: PMC10471748 DOI: 10.1038/s41598-023-41181-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 08/23/2023] [Indexed: 09/02/2023] Open
Abstract
The results of randomized controlled trials are unclear about the long-term effect of blood pressure (BP) on kidney function assessed as the glomerular filtration rate (GFR) in persons without chronic kidney disease or diabetes. The limited duration of follow-up and use of imprecise methods for assessing BP and GFR are important reasons why this issue has not been settled. Since a long-term randomized trial is unlikely, we investigated the association between 24-h ambulatory BP (ABP) and measured GFR in a cohort study with a median follow-up of 11 years. The Renal Iohexol Clearance Survey (RENIS) cohort is a representative sample of persons aged 50 to 62 years without baseline cardiovascular disease, diabetes, or kidney disease from the general population of Tromsø in northern Norway. ABP was measured at baseline, and iohexol clearance at baseline and twice during follow-up. The study population comprised 1589 persons with 4127 GFR measurements. Baseline ABP or office BP components were not associated with the GFR change rate in multivariable adjusted conventional regression models. In generalized additive models for location, scale, and shape (GAMLSS), higher daytime systolic, diastolic, and mean arterial ABP were associated with a slight shift of the central part of the GFR distribution toward lower GFR and with higher probability of GFR < 60 mL/min/1.73 m2 during follow-up (p < 0.05). The use of a distributional regression method and precise methods for measuring exposure and outcome were necessary to detect an unfavorable association between BP and GFR in this study of the general population.
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Affiliation(s)
- Bjørn O Eriksen
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway.
- Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway.
| | - Matteo Fasiolo
- School of Mathematics, University of Bristol, Bristol, UK
| | - Ulla D Mathisen
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
| | - Trond G Jenssen
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway
- Department of Transplant Medicine, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Vidar T N Stefansson
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
| | - Toralf Melsom
- Metabolic and Renal Research Group, UiT The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
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Chang J, Pais GM, Marianski S, Valdez K, Lesnicki E, Barreto EF, Scheetz MH. Iohexol-Measured Glomerular Filtration Rate and Urinary Biomarker Changes between Vancomycin and Vancomycin Plus Piperacillin-Tazobactam in a Translational Rat Model. Antimicrob Agents Chemother 2023; 67:e0030423. [PMID: 37428202 PMCID: PMC10433876 DOI: 10.1128/aac.00304-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 06/14/2023] [Indexed: 07/11/2023] Open
Abstract
Recent clinical studies have reported additive nephrotoxicity with the combination of vancomycin and piperacillin-tazobactam. However, preclinical models have failed to replicate this finding. This study assessed differences in iohexol-measured glomerular filtration rate (GFR) and urinary injury biomarkers among rats receiving this antibiotic combination. Male Sprague-Dawley rats received either intravenous vancomycin, intraperitoneal piperacillin-tazobactam, or both for 96 h. Iohexol-measured GFR was used to quantify real-time kidney function changes. Kidney injury was evaluated with the urinary biomarkers kidney injury molecule-1 (KIM-1), clusterin, and osteopontin. Compared to the control, rats that received vancomycin had numerically lower GFRs after drug dosing on day 3. Rats in this group also had elevations in urinary KIM-1 on experimental days 2 and 4. Increasing urinary KIM-1 was found to correlate with decreasing GFR on experimental days 1 and 3. Rats that received vancomycin plus piperacillin-tazobactam (vancomycin+piperacillin-tazobactam) did not exhibit worse kidney function or injury biomarkers than rats receiving vancomycin alone. The combination of vancomycin and piperacillin-tazobactam does not cause additive nephrotoxicity in a translational rat model. Future clinical studies investigating this antibiotic combination should employ more sensitive biomarkers of kidney function and injury, similar to those utilized in this study.
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Affiliation(s)
- Jack Chang
- Midwestern University-Downers Grove Campus, Department of Pharmacy Practice, Downers Grove, Illinois, USA
- Midwestern University-Downers Grove Campus, Pharmacometrics Center of Excellence, Downers Grove, Illinois, USA
- Northwestern Memorial Hospital, Department of Pharmacy, Chicago, Illinois, USA
| | - Gwendolyn M. Pais
- Midwestern University-Downers Grove Campus, Department of Pharmacy Practice, Downers Grove, Illinois, USA
- Midwestern University-Downers Grove Campus, Pharmacometrics Center of Excellence, Downers Grove, Illinois, USA
| | - Sylwia Marianski
- Midwestern University-Downers Grove Campus, Department of Pharmacy Practice, Downers Grove, Illinois, USA
| | - Kimberly Valdez
- Midwestern University-Downers Grove Campus, Department of Pharmacy Practice, Downers Grove, Illinois, USA
| | - Emily Lesnicki
- Midwestern University-Downers Grove Campus, College of Graduate Studies, Downers Grove, Illinois, USA
| | - Erin F. Barreto
- Mayo Clinic, Department of Pharmacy, Rochester, Minnesota, USA
| | - Marc H. Scheetz
- Midwestern University-Downers Grove Campus, Department of Pharmacy Practice, Downers Grove, Illinois, USA
- Midwestern University-Downers Grove Campus, Pharmacometrics Center of Excellence, Downers Grove, Illinois, USA
- Northwestern Memorial Hospital, Department of Pharmacy, Chicago, Illinois, USA
- Midwestern University-Downers Grove Campus, Department of Pharmacology, Downers Grove, Illinois, USA
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Haines RW, Fowler AJ, Liang K, Pearse RM, Larsson AO, Puthucheary Z, Prowle JR. Comparison of Cystatin C and Creatinine in the Assessment of Measured Kidney Function during Critical Illness. Clin J Am Soc Nephrol 2023; 18:997-1005. [PMID: 37256861 PMCID: PMC10564373 DOI: 10.2215/cjn.0000000000000203] [Citation(s) in RCA: 17] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 05/26/2023] [Indexed: 06/02/2023]
Abstract
BACKGROUND Incomplete recovery of kidney function is an important adverse outcome in survivors of critical illness. However, unlike eGFR creatinine, eGFR cystatin C is not confounded by muscle loss and may improve identification of persistent kidney dysfunction. METHODS To assess kidney function during prolonged critical illness, we enrolled 38 mechanically ventilated patients with an expected length of stay of >72 hours near admission to intensive care unit (ICU) in a single academic medical center. We assessed sequential kidney function using creatinine, cystatin C, and iohexol clearance measurements. The primary outcome was difference between eGFR creatinine and eGFR cystatin C at ICU discharge using Bayesian regression modeling. We simultaneously measured muscle mass by ultrasound of the rectus femoris to assess the confounding effect on serum creatinine generation. RESULTS Longer length of ICU stay was associated with greater difference between eGFR creatinine and eGFR cystatin C at a predicted rate of 2 ml/min per 1.73 m 2 per day (95% confidence interval [CI], 1 to 2). By ICU discharge, the posterior mean difference between creatinine and cystatin C eGFR was 33 ml/min per 1.73 m 2 (95% credible interval [CrI], 24 to 42). In 27 patients with iohexol clearance measured close to ICU discharge, eGFR creatinine was on average two-fold greater than the iohexol gold standard, and posterior mean difference was 59 ml/min per 1.73 m 2 (95% CrI, 49 to 69). The posterior mean for eGFR cystatin C suggested a 22 ml/min per 1.73 m 2 (95% CrI, 13 to 31) overestimation of measured GFR. Each day in ICU resulted in a predicted 2% (95% CI, 1% to 3%) decrease in muscle area. Change in creatinine-to-cystatin C ratio showed good longitudinal, repeated measures correlation with muscle loss, R =0.61 (95% CI, 0.50 to 0.72). CONCLUSIONS eGFR creatinine systematically overestimated kidney function after prolonged critical illness. Cystatin C better estimated true kidney function because it seemed unaffected by the muscle loss from prolonged critical illness. CLINICAL TRIAL REGISTRY NAME AND REGISTRATION NUMBER Skeletal Muscle Wasting and Renal Dysfunction After Critical Illness Trauma - Outcomes Study (KRATOS), NCT03736005 .
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Affiliation(s)
- Ryan W. Haines
- Adult Critical Care Unit, The Royal London Hospital, Barts Health NHS Trust, Whitechapel Road, London, United Kingdom
- William Harvey Research Institute, Queen Mary University of London, London, United Kingdom
| | - Alex J. Fowler
- Adult Critical Care Unit, The Royal London Hospital, Barts Health NHS Trust, Whitechapel Road, London, United Kingdom
- William Harvey Research Institute, Queen Mary University of London, London, United Kingdom
| | - Kaifeng Liang
- Adult Critical Care Unit, The Royal London Hospital, Barts Health NHS Trust, Whitechapel Road, London, United Kingdom
| | - Rupert M. Pearse
- Adult Critical Care Unit, The Royal London Hospital, Barts Health NHS Trust, Whitechapel Road, London, United Kingdom
- William Harvey Research Institute, Queen Mary University of London, London, United Kingdom
| | - Anders O. Larsson
- Department of Medical Sciences, Clinical Chemistry, Uppsala University, Uppsala, Sweden
| | - Zudin Puthucheary
- Adult Critical Care Unit, The Royal London Hospital, Barts Health NHS Trust, Whitechapel Road, London, United Kingdom
- William Harvey Research Institute, Queen Mary University of London, London, United Kingdom
| | - John R. Prowle
- Adult Critical Care Unit, The Royal London Hospital, Barts Health NHS Trust, Whitechapel Road, London, United Kingdom
- William Harvey Research Institute, Queen Mary University of London, London, United Kingdom
- Department of Renal Medicine and Transplantation, The Royal London Hospital, Barts Health NHS Trust, Whitechapel Road, London, United Kingdom
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Enoksen ITT, Rinde NB, Svistounov D, Norvik JV, Solbu MD, Eriksen BO, Melsom T. Validation of eGFR for Detecting Associations Between Serum Protein Biomarkers and Subsequent GFR Decline. J Am Soc Nephrol 2023; 34:1409-1420. [PMID: 37093083 PMCID: PMC10400103 DOI: 10.1681/asn.0000000000000147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 04/01/2023] [Indexed: 04/25/2023] Open
Abstract
SIGNIFICANCE STATEMENT eGFR from creatinine, cystatin C, or both has been primarily used in search of biomarkers for GFR decline. Whether the relationships between biomarkers and eGFR decline are similar to associations with measured GFR (mGFR) decline has not been investigated. This study revealed that some biomarkers showed statistically significant different associations with eGFR decline compared with mGFR decline, particularly for eGFR from cystatin C. The findings indicate that non-GFR-related factors, such as age, sex, and body mass index, influence the relationship between biomarkers and eGFR decline. Therefore, the results of biomarker studies using eGFR, particularly eGFRcys, should be interpreted with caution and perhaps validated with mGFR. BACKGROUND Several serum protein biomarkers have been proposed as risk factors for GFR decline using eGFR from creatinine or cystatin C. We investigated whether eGFR can be used as a surrogate end point for measured GFR (mGFR) when searching for biomarkers associated with GFR decline. METHODS In the Renal Iohexol Clearance Survey, GFR was measured with plasma iohexol clearance in 1627 individuals without diabetes, kidney, or cardiovascular disease at baseline. After 11 years of follow-up, 1409 participants had one or more follow-up GFR measurements. Using logistic regression and interval-censored Cox regression, we analyzed the association between baseline levels of 12 serum protein biomarkers with the risk of accelerated GFR decline and incident CKD for both mGFR and eGFR. RESULTS Several biomarkers exhibited different associations with eGFR decline compared with their association with mGFR decline. More biomarkers showed different associations with eGFRcys decline than with eGFRcre decline. Most of the different associations of eGFR decline versus mGFR decline remained statistically significant after adjustment for age, sex, and body mass index, but several were attenuated and not significant after adjusting for the corresponding baseline mGFR or eGFR. CONCLUSIONS In studies of some serum protein biomarkers, eGFR decline may not be an appropriate surrogate outcome for mGFR decline. Although the differences from mGFR decline are attenuated by adjustment for confounding factors in most cases, some persist. Therefore, proposed biomarkers from studies using eGFR should preferably be validated with mGFR.
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Affiliation(s)
- Inger T. T. Enoksen
- Metabolic and Renal Research Group, UiT– The Arctic University of Norway, Tromsø, Norway
| | - Nikoline B. Rinde
- Metabolic and Renal Research Group, UiT– The Arctic University of Norway, Tromsø, Norway
| | - Dmitri Svistounov
- Metabolic and Renal Research Group, UiT– The Arctic University of Norway, Tromsø, Norway
| | - Jon V. Norvik
- Metabolic and Renal Research Group, UiT– The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
| | - Marit D. Solbu
- Metabolic and Renal Research Group, UiT– The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
| | - Bjørn O. Eriksen
- Metabolic and Renal Research Group, UiT– The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
| | - Toralf Melsom
- Metabolic and Renal Research Group, UiT– The Arctic University of Norway, Tromsø, Norway
- Section of Nephrology, Clinic of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
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Fu EL, Levey AS, Coresh J, Elinder CG, Rotmans JI, Dekker FW, Paik JM, Barany P, Grams ME, Inker LA, Carrero JJ. Accuracy of GFR Estimating Equations in Patients with Discordances between Creatinine and Cystatin C-Based Estimations. J Am Soc Nephrol 2023; 34:1241-1251. [PMID: 36995139 PMCID: PMC10356168 DOI: 10.1681/asn.0000000000000128] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 03/13/2023] [Indexed: 03/31/2023] Open
Abstract
SIGNIFICANCE STATEMENT Large discordances between eGFR on the basis of creatinine (eGFR cr ) or cystatin C (eGFR cys ) are common in clinical practice. However, which GFR estimating equation (eGFR cr , eGFR cys , or eGFR cr-cys ) is most accurate in these settings is not known. In this real-world study of 9404 concurrent measurements of creatinine, cystatin C, and iohexol clearance, all three equations performed similarly when eGFR cr and eGFR cys were similar (45% of cases). However, with large discordances (55% of cases), eGFR cr-cys was much more accurate than either alone. These findings were consistent among individuals with cardiovascular disease, heart failure, diabetes mellitus, liver disease, and cancer who have been underrepresented in research cohorts. Thus, when eGFR cr and eGFR cys are largely discordant in clinical practice, eGFR cr-cys is more accurate than eGFR cr or eGFR cys . BACKGROUND Cystatin C is recommended as a confirmatory test to eGFR when more precise estimates are needed for clinical decision making. Although eGFR on the basis of both creatinine and cystatin (eGFR cr-cys ) is the most accurate estimate in research studies, it is uncertain whether this is true in real-world settings, particularly when there are large discordances between eGFR based on creatinine (eGFR cr ) and that based on cystatin C (eGFR cys ). METHODS We included 6185 adults referred for measured GFR (mGFR) using plasma clearance of iohexol in Stockholm, Sweden, who had 9404 concurrent measurements of creatinine, cystatin C, and iohexol clearance. The performance of eGFR cr , eGFR cys , and eGFR cr-cys was assessed against mGFR with median bias, P30 , and correct classification of GFR categories. We stratified analyses within three categories: eGFR cys at least 20% lower than eGFR cr (eGFR cys eGFR cr ). RESULTS eGFR cr and eGFR cys were similar in 4226 (45%) samples, and among these samples all three estimating equations performed similarly. By contrast, eGFR cr-cys was much more accurate in cases of discordance. For example, when eGFR cys eGFR cr (8% of samples), the median biases were -4.5, 8.4, and 1.4 ml/min per 1.73m 2 . The findings were consistent among individuals with cardiovascular disease, heart failure, diabetes mellitus, liver disease, and cancer. CONCLUSIONS When eGFR cr and eGFR cys are highly discordant in clinical practice, eGFR cr-cys is more accurate than either eGFR cr or eGFR cys .
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Affiliation(s)
- Edouard L. Fu
- Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Harvard Medical School, Brigham and Women's Hospital, Boston, Massachusetts
- Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Stockholm, Sweden
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, The Netherlands
| | - Andrew S. Levey
- Division of Nephrology, Department of Internal Medicine, Tufts Medical Center, Boston, Massachusetts
| | - Josef Coresh
- Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland
| | - Carl-Gustaf Elinder
- Division of Renal Medicine, Department of Clinical Intervention and Technology, Karolinska Institute, Karolinska University Hospital, Stockholm, Sweden
| | - Joris I. Rotmans
- Department of Internal Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Friedo W. Dekker
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, The Netherlands
| | - Julie M. Paik
- Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Harvard Medical School, Brigham and Women's Hospital, Boston, Massachusetts
| | - Peter Barany
- Division of Renal Medicine, Department of Clinical Intervention and Technology, Karolinska Institute, Karolinska University Hospital, Stockholm, Sweden
| | - Morgan E. Grams
- Department of Internal Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Lesley A. Inker
- Division of Nephrology, Department of Internal Medicine, Tufts Medical Center, Boston, Massachusetts
| | - Juan-Jesus Carrero
- Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Stockholm, Sweden
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James SN, Sengar A, Vijayanandan A. Investigating the biodegradability of iodinated X-ray contrast media in simultaneous nitrification and denitrification system. J Hazard Mater 2023; 452:131196. [PMID: 36940530 DOI: 10.1016/j.jhazmat.2023.131196] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Revised: 02/22/2023] [Accepted: 03/10/2023] [Indexed: 05/03/2023]
Abstract
The present study investigated the biodegradation of three iodinated X-ray contrast media (ICM), namely, iopamidol, iohexol, and iopromide, in simultaneous nitrification-denitrification (SND) system maintained in a sequencing batch reactor (SBR). The results showed that variable aeration patterns (anoxic-aerobic-anoxic) and micro-aerobic condition were most effective in the biotransformation of ICM while achieving organic carbon and nitrogen removal. The highest removal efficiencies of iopamidol, iohexol, and iopromide were 48.24%, 47.75%, and 57.46%, respectively, in micro-aerobic condition. Iopamidol was highly resistant to biodegradation and possessed the lowest Kbio value, followed by iohexol and iopromide, regardless of operating conditions. The removal of iopamidol and iopromide was affected by the inhibition of nitrifiers. The transformation products after hydroxylation, dehydrogenation, and deiodination of ICM were detected in the treated effluent. Due to the addition of ICM, the abundance of denitrifier genera Rhodobacter and Unclassified Comamonadaceae increased, and the abundance of class TM7-3 decreased. The presence of ICM affected the microbial dynamics, and the diversity of microbes in SND resulted in improving the biodegradability of the compounds.
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Affiliation(s)
- Susan N James
- Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India
| | - Ashish Sengar
- Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India
| | - Arya Vijayanandan
- Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi 110016, India.
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Sengar A, Vijayanandan A. Fate and removal of iodinated X-ray contrast media in membrane bioreactor: Microbial dynamics and effects of different operational parameters. Sci Total Environ 2023; 869:161827. [PMID: 36708825 DOI: 10.1016/j.scitotenv.2023.161827] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 01/18/2023] [Accepted: 01/21/2023] [Indexed: 06/18/2023]
Abstract
Iodinated X-ray contrast media (ICM) are mainly used in medical sector, and their presence in environmental waters is a cause of concern as they are capable of forming highly toxic iodinated disinfection byproducts. In the present study, the removal mechanisms of the three ICM- iohexol, iopromide, and iopamidol were elucidated in a lab-scale aerobic membrane bioreactor (MBR). At steady-state operation (solids retention time (SRT)- 70 days, organic loading rate (OLR)- 0.80 KgCOD/m3-day, nitrogen loading rate (NLR)- 0.08 KgNH4-N/m3-day, hydraulic retention time (HRT)- 12 h), the average removal of iohexol and iopromide was found to be 34.9 and 45.2 %, respectively, whereas iopamidol proved to be highly recalcitrant in aerobic conditions of the MBR (removal <10 % in all phases of the MBR operation). Further, through batch kinetic studies and mass balance analysis, it was observed that ICM were primarily biotransformed in the MBR system and biosorption (Kd < 10 L/Kg) was negligible. The biodegradation rate coefficient values (Kbiol) of the ICM were found to be <0.65 L/g-d which indicate that biotransformation rate of ICM was slow. Increased OLR (1.60 KgCOD/m3-day) and reduced SRT (20 days) were found to negatively affect the removal of the ICM. Further, the removal of ICM was found to depend on its initial concentration, and the increment in the ammonium loading (0.16 KgNH4-N/m3-day) did not favor its removal. The dosing of ICM altered the microbial dynamics of the mixed liquor and reduced the microbial diversity and richness. Bdellovibrio, Zoogloea, and bacteria belonging to TM7-3 class, Cryomorphaceae and Hyphomonadaceae families may contribute in ICM biotransformation.
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Affiliation(s)
- Ashish Sengar
- Department of Civil Engineering, Indian Institute of Technology Delhi (IIT Delhi), New Delhi 110016, India
| | - Arya Vijayanandan
- Department of Civil Engineering, Indian Institute of Technology Delhi (IIT Delhi), New Delhi 110016, India.
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Guo X, Peng H, Liu P, Tang L, Fang J, Aoieong C, Tou T, Tsai T, Liu X. Novel Metabolites to Improve Glomerular Filtration Rate Estimation. Kidney Blood Press Res 2023; 48:287-296. [PMID: 37037191 PMCID: PMC10308533 DOI: 10.1159/000530209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 03/08/2023] [Indexed: 04/12/2023] Open
Abstract
INTRODUCTION The glomerular filtration rate (GFR) is crucial for chronic kidney disease (CKD) diagnosis and therapy. Various studies have sought to recognize ideal endogenous markers to improve the estimated GFR for clinical practice. To screen out potential novel metabolites related to GFR (mGFR) measurement in CKD patients from the Chinese population, we identified more biomarkers for improving GFR estimation. METHODS Fifty-three CKD participants were recruited from the Third Affiliated Hospital of Sun Yat-sen University in 2020. For each participant, mGFR was evaluated by utilizing the plasma clearance of iohexol and collecting serum samples for untargeted metabolomics analyses by ultrahigh-performance liquid chromatography-tandem mass spectroscopy. All participants were divided into four groups according to mGFR. The metabolite peak area data were uploaded to MetaboAnalyst 5.0 for one-way analysis of variance, principal component analysis, and partial least squares-discriminant analysis and confirmed the metabolites whose levels increased or decreased with mGFR and variable importance in projection (VIP) values >1. Metabolites were ranked by correlation with the original values of mGFR, and metabolites with a correlation coefficient >0.8 and VIP >2 were identified. RESULTS We screened out 198 metabolites that increased or decreased with mGFR decline. After ranking by correlation with mGFR, the top 50 metabolites were confirmed. Further studies confirmed the 10 most highly correlated metabolites. CONCLUSION We screened out the metabolites that increased or decreased with mGFR decline in CKD patients from the Chinese population, and 10 of them were highly correlated. They are potential novel metabolites to improve GFR estimation.
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Affiliation(s)
- Xinghua Guo
- Department of Rheumatology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Hongquan Peng
- Department of Nephrology, Kiang Wu Hospital, Macau, China
| | - Peijia Liu
- Department of Nephrology, GuangZhou Eighth People’s Hospital, GuangZhou Medical University, Guangzhou, China
| | - Leile Tang
- Department of Cardiovasology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Jia Fang
- Department of Nephrology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Chiwa Aoieong
- Department of Nephrology, Kiang Wu Hospital, Macau, China
| | - Tou Tou
- Department of Nephrology, Kiang Wu Hospital, Macau, China
| | - Tsungyang Tsai
- Department of Nephrology, Kiang Wu Hospital, Macau, China
| | - Xun Liu
- Department of Nephrology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
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Otgonbaatar C, Ryu JK, Shin J, Kim HM, Seo JW, Shim H, Hwang DH. Deep learning reconstruction allows for usage of contrast agent of lower concentration for coronary CTA than filtered back projection and hybrid iterative reconstruction. Acta Radiol 2023; 64:1007-1017. [PMID: 35979586 DOI: 10.1177/02841851221118476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND The demand for homogeneous and higher vascular contrast enhancement is critical to provide an appropriate interpretation of abnormal vascular findings in coronary computed tomography angiography (CTA). PURPOSE To evaluate the effect of various contrast media concentrations (Iohexol-370, Iohexol-300, Iohexol-240) and image reconstructions (filtered back projection [FBP], hybrid iterative reconstruction [IR], and deep learning reconstruction [DLR]) on coronary CTA. MATERIAL AND METHODS A total of 63 patients referred for coronary CTA between July and October 2021 were enrolled in this prospective study, and they randomly received one of three contrast media. CTA images were reconstructed with FBP, hybrid IR, and DLR. The CT attenuation, image noise, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR) were calculated for all three images. The images were subjectively evaluated by two radiologists in terms of overall image quality, artifacts, image noise, and vessel wall delineation on a 5-point Likert scale. RESULTS The application of DLR resulted in significantly lower image noise; higher CT attenuation, SNR, and CNR; and better subjective analysis among the three different concentrations of contrast media groups (P < 0.001). There was no significant difference in the CT attenuation of the left ventricle (P = 0.089) and coronary arteries (P = 0.072) between hybrid IR at Iohexol-300 and DLR at Iohexol-240. Furthermore, application of DLR to the Iohexol-240 significantly improved SNR and CNR; it achieved higher subjective scores compared with hybrid IR at Iohexol-300 (P < 0.001). CONCLUSION We suggest that using DLR with Iohexol-240 contrast media is preferable to hybrid IR with Iohexol-300 contrast media in coronary CTA.
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Affiliation(s)
- Chuluunbaatar Otgonbaatar
- Department of Radiology, 26725Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Jae-Kyun Ryu
- Medical Imaging AI Research Center, 496517Canon Medical Systems Korea, Seoul, Republic of Korea
| | - Jaemin Shin
- Department of Neurology, 58934Korea University Guro Hospital, Seoul, Republic of Korea
| | - Han Myun Kim
- Department of Radiology, 65521Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Republic of Korea
| | - Jung Wook Seo
- Department of Radiology, 119750Inje University Ilsan Paik Hospital, Goyang, Republic of Korea
| | - Hackjoon Shim
- Medical Imaging AI Research Center, 496517Canon Medical Systems Korea, Seoul, Republic of Korea
- ConnectAI Research Center, 37991Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Dae Hyun Hwang
- Department of Radiology, 65521Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Republic of Korea
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Cheng X, Xia Y, Ji Q, Ji Q, Li H, Guo J, Li S, Yang S, Zhang L, He H. Occurrence and risk of iodinated X-ray contrast media in source and tap water from Jiangsu province, China. J Hazard Mater 2023; 444:130399. [PMID: 36403453 DOI: 10.1016/j.jhazmat.2022.130399] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 10/31/2022] [Accepted: 11/12/2022] [Indexed: 06/16/2023]
Abstract
Microcontaminants in the water environment have received increasing attention due to their adverse effects on human health and wildlife. However, iodinated X-ray contrast media (ICM), a type of microcontaminants, have not yet been systematically documented in source and tap water. This study investigated ICM in water samples via a sampling activity from 25 drinking water sources and their corresponding 30 household taps in south-central Jiangsu Province, China. The total concentrations of ICM ranged from 14.2 to 138.5 ng/L in source water and 3.7 to 101.3 ng/L in tap water, respectively. The calculated average water treatment efficiency to remove ICM is 38.3% with large variation under different processes (ranging from 7.3% to 75.7%), which implied that ICM could not be effectively removed using current treatment technologies. By integrating other ICM into the predominant compound iohexol with relative potency factors, the health risks of total ICM through water consumption were assessed using the Monte Carlo simulation. The results concluded that the risk of ingesting ICM through tap water was not a major health concern for adults, teens, or children in the study area. Nevertheless, due to the lack of long-term toxicity data relevant for humans for ICM, this risk may be underestimated, which requires further research.
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Affiliation(s)
- Xinying Cheng
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P.R. China
| | - Yubao Xia
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P.R. China
| | - Qiuyi Ji
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P.R. China
| | - Qingsong Ji
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P.R. China
| | - Huiming Li
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P.R. China
| | - Jiehong Guo
- Masonic Cancer Center, University of Minnesota at Twin Cities, Minneapolis, Minnesota 55455, USA; Department of Civil, Environmental, and Geospatial Engineering, Michigan Technological University, Michigan 49931, USA
| | - Shiyin Li
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P.R. China
| | - Shaogui Yang
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P.R. China
| | - Limin Zhang
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P.R. China; Green Economy Development Institute, Nanjing University of Finance and Economics, Nanjing, Jiangsu 210023, P.R. China
| | - Huan He
- School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, P.R. China; College of Ecological and Resource Engineering, Fujian Provincial Key laboratory of Eco-Industrial Green Technology, Wuyi University, Wuyishan, Fujian 354300, P.R. China.
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Olausson M, Antony D, Johansson M, Travnikova G, Nayakawde NB, Banerjee D, Mackay Søfteland J, Ognissanti D, Andresen Bergström M, Hammarsten O, Premaratne GU. Long-term Transplant Function After Thrombolytic Treatment Ex Vivo of Donated Kidneys Retrieved 4 to 5 H After Circulatory Death. Transplantation 2022; 106:2348-2359. [PMID: 35831928 PMCID: PMC9698194 DOI: 10.1097/tp.0000000000004235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 04/29/2022] [Accepted: 05/18/2022] [Indexed: 12/24/2022]
Abstract
BACKGROUND Using a novel thrombolytic technique, we present long-term transplant function, measured by creatinine and iohexol clearance, after utilizing kidneys from porcine donors with uncontrolled donation after circulatory deaths, with 4.5-5 h of warm ischemia. METHODS Pigs in the study group were subjected to simulated circulatory death. After 2 h, ice slush was inserted into the abdomen and 4.5 h after death, the kidneys were retrieved. Lys-plasminogen, antithrombin-III, and alteplase were injected through the renal arteries on the back table. Subsequent ex vivo perfusion was continued for 3 h at 15°C, followed by 3 h with red blood cells at 32°C, and then transplanted into pigs as an autologous graft as only renal support. Living-donor recipient pigs that did not receive ex vivo perfusion, and unilateral nephrectomized pigs served as the controls. RESULTS Pigs in the study group (n = 13), surviving 10 d or more were included, of which 7 survived for 3 mo. Four animals in the living-donor group (n = 6) and all 5 nephrectomized animals survived for 3 mo. Creatinine levels in the plasma and urine, neutrophil gelatinase-associated lipocalin levels, Kidney Injury Marker-1 expression, and iohexol clearance at 3 mo did not differ significantly between the study and living-donor groups. Histology and transmission electron microscopy after 3 mo showed negligible fibrosis and no other damage. CONCLUSIONS The present method salvages kidneys from extended unontrolled donation after circulatory death using thrombolytic treatment while preserving histology and enabling transplantation after ex vivo reconditioning, with clinically acceptable late function after 3 mo, as measured by creatinine and iohexol clearance.
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Affiliation(s)
- Michael Olausson
- Department of Transplantation, Sahlgrenska Academy, Gothenburg University and the Sahlgrenska Transplant Institute at Sahlgrenska University Hospital, Gothenburg, Sweden
- Department of Transplantation Surgery, Laboratory for Transplantation and Regenerative Medicine, Sahlgrenska Academy at Gothenburg University and the Sahlgrenska Transplant Institute at Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Deepti Antony
- Department of Transplantation Surgery, Laboratory for Transplantation and Regenerative Medicine, Sahlgrenska Academy at Gothenburg University and the Sahlgrenska Transplant Institute at Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Martin Johansson
- Department of Laboratory Medicine, Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden
| | - Galina Travnikova
- Department of Transplantation Surgery, Laboratory for Transplantation and Regenerative Medicine, Sahlgrenska Academy at Gothenburg University and the Sahlgrenska Transplant Institute at Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Nikhil B. Nayakawde
- Department of Transplantation Surgery, Laboratory for Transplantation and Regenerative Medicine, Sahlgrenska Academy at Gothenburg University and the Sahlgrenska Transplant Institute at Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Debashish Banerjee
- Department of Transplantation Surgery, Laboratory for Transplantation and Regenerative Medicine, Sahlgrenska Academy at Gothenburg University and the Sahlgrenska Transplant Institute at Sahlgrenska University Hospital, Gothenburg, Sweden
| | - John Mackay Søfteland
- Department of Transplantation, Sahlgrenska Academy, Gothenburg University and the Sahlgrenska Transplant Institute at Sahlgrenska University Hospital, Gothenburg, Sweden
- Department of Transplantation Surgery, Laboratory for Transplantation and Regenerative Medicine, Sahlgrenska Academy at Gothenburg University and the Sahlgrenska Transplant Institute at Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Damiano Ognissanti
- Department of Mathematic, Chalmers University of Technology and Gothenburg University, Gothenburg, Sweden
| | - Moa Andresen Bergström
- Department of Laboratory Medicine, Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden
- Department of Clinical Chemistry, Laboratory of Clinical Chemistry, Sahlgrenska University Hospital, SE-41345 Gothenburg, Sweden
| | - Ola Hammarsten
- Department of Laboratory Medicine, Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden
- Department of Clinical Chemistry, Laboratory of Clinical Chemistry, Sahlgrenska University Hospital, SE-41345 Gothenburg, Sweden
| | - Goditha U. Premaratne
- Department of Transplantation Surgery, Laboratory for Transplantation and Regenerative Medicine, Sahlgrenska Academy at Gothenburg University and the Sahlgrenska Transplant Institute at Sahlgrenska University Hospital, Gothenburg, Sweden
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Akao PK, Kaplan A, Avisar D, Dhir A, Avni A, Mamane H. Removal of carbamazepine, venlafaxine and iohexol from wastewater effluent using coupled microalgal-bacterial biofilm. Chemosphere 2022; 308:136399. [PMID: 36099989 DOI: 10.1016/j.chemosphere.2022.136399] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 08/08/2022] [Accepted: 09/06/2022] [Indexed: 06/15/2023]
Abstract
We evaluated the removal capacity of a coupled microalgal-bacterial biofilm (CMBB) to eliminate three recalcitrant pharmaceuticals. The CMBB's efficiency, operating at different biofilm concentrations, with or without light, was compared and analyzed to correlate these parameters to pharmaceutical removal and their effect on the microorganism community. Removal rates changed with changing pharmaceutical and biofilm concentrations: higher biofilm concentrations presented higher removal. Removal of 82-94% venlafaxine and 18-51% carbamazepine was obtained with 5 days of CMBB treatment. No iohexol removal was observed. Light, microorganism composition, and dissolved oxygen concentration are essential parameters governing the removal of pharmaceuticals and ammonia. Chlorophyll concentration increased with time, even in the dark. Three bacterial phyla were dominant: Proteobacteria, Bacteroidetes and Firmicutes. The dominant eukaryotic supergroups were Archaeplastida, Excavata and SAR. A study of the microorganisms' community indicated that not only do the species in the biofilm play an important role; environment, concentration and interactions among them are also important. CMBB has the potential to provide low-cost and sustainable treatment for wastewater and recalcitrant pharmaceutical removal. The microenvironments on the biofilm created by the microalgae and bacteria improved treatment efficiency.
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Affiliation(s)
- Patricia K Akao
- School of Mechanical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv, 69978, Israel; The Water Research Center, Porter School of the Environment and Earth Sciences, Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, 69978, Israel.
| | - Aviv Kaplan
- The Water Research Center, Porter School of the Environment and Earth Sciences, Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, 69978, Israel
| | - Dror Avisar
- The Water Research Center, Porter School of the Environment and Earth Sciences, Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, 69978, Israel
| | - Amit Dhir
- School of Energy and Environment, Thapar Institute of Engineering and Technology, Patiala, 69978, India
| | - Adi Avni
- School of Plant Science and Food Security, Tel Aviv University, Tel Aviv, 69978, Israel
| | - Hadas Mamane
- School of Mechanical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv, 69978, Israel
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Dhont E, Windels C, Snauwaert E, Van Der Heggen T, de Jaeger A, Dhondt L, Delanghe J, Croubels S, Walle JV, De Paepe P, De Cock PA. Reliability of glomerular filtration rate estimating formulas compared to iohexol plasma clearance in critically ill children. Eur J Pediatr 2022; 181:3851-3866. [PMID: 36053381 DOI: 10.1007/s00431-022-04570-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 07/14/2022] [Accepted: 07/18/2022] [Indexed: 11/30/2022]
Abstract
UNLABELLED Accurate renal function assessment is crucial to guide intensive care decision-making and drug dosing. Estimates of glomerular filtration rate (eGFR) are routinely used in critically ill children; however, these formulas were never evaluated against measured GFR (mGFR) in this population. We aimed to assess the reliability of common eGFR formulas compared to iohexol plasma clearance (CLiohexol) in a pediatric intensive care (PICU) population. Secondary outcomes were the prevalence of acute kidney injury (AKI) (by pRIFLE criteria) and augmented renal clearance (ARC) (defined as standard GFR for age + 2 standard deviations (SD)) within 48 h after admission based on mGFR and eGFR by the revised Schwartz formula and the difference between these two methods to diagnose AKI and ARC. In children, between 0 and 15 years of age, without chronic renal disease, GFR was measured by CLiohexol and estimated using 26 formulas based on creatinine (Scr), cystatine C (CysC), and betatrace protein (BTP), early after PICU admission. eGFR and mGFR results were compared for the entire study population and in subgroups according to age, using Bland-Altman analysis with calculation of bias, precision, and accuracy expressed as percentage of eGFR results within 30% (P30) and 10% (P10) of mGFR. CLiohexol was measured in 98 patients. Mean CLiohexol (± SD) was 115 ± 54 ml/min/1.73m2. Most eGFR formulas showed overestimation of mGFR with large bias and poor precision reflected by wide limits of agreement (LoA). Bias was larger with CysC- and BTP-based formulas compared to Scr-based formulas. In the entire study population, none of the eGFR formulas showed the minimal desired P30 > 75%. The widely used revised Schwartz formula overestimated mGFR with a high percentage bias of - 18 ± 51% (95% confidence interval (CI) - 29; - 9), poor precision with 95% LoA from - 120 to 84% and insufficient accuracy reflected by P30 of only 51% (95% CI 41; 61), and P10 of 21% (95% CI 13; 66) in the overall population. Although performance of Scr-based formulas was worst in children below 1 month of age, exclusion of neonates and younger children did not result in improved agreement and accuracy. Based on mGFR, prevalence of AKI and ARC within 48 h was 17% and 45% of patients, respectively. There was poor agreement between revised Schwartz formula and mGFR to diagnose AKI (kappa value of 0.342, p < 0.001; sensitivity of 30%, 95% CI 5; 20%) and ARC (kappa value of 0.342, p < 0.001; sensitivity of 70%, 95% CI 33; 58). CONCLUSION In this proof-of-concept study, eGFR formulas were found to be largely inaccurate in the PICU population. Clinicians should therefore use these formulas with caution to guide drug dosing and therapeutic interventions in critically ill children. More research in subgroup populations is warranted to conclude on generalizability of these study findings. CLINICALTRIALS gov NCT05179564, registered retrospectively on January 5, 2022. WHAT IS KNOWN • Both acute kidney injury and augmented renal clearance may be present in PICU patients and warrant adaptation of therapy, including drug dosing. • Biomarker-based eGFR formulas are widely used for GFR assessment in critically ill children, although endogenous filtration biomarkers have important limitations in PICU patients and eGFR formulas have never been validated against measured GFR in this population. WHAT IS NEW • eGFR formulas were found to be largely inaccurate in the PICU population when compared to measured GFR by iohexol clearance. Clinicians should therefore use these formulas with caution to guide drug dosing and therapeutic interventions in critically ill children. • Iohexol plasma clearance could be considered an alternative for accurate GFR assessment in PICU patients.
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Affiliation(s)
- Evelyn Dhont
- Department of Pediatric Intensive Care, Pediatric Intensive Care 1K12D, Ghent University Hospital, C. Heymanslaan 10, 9000, Ghent, Belgium.
- Faculty of Medicine and Health Sciences, Department of Basic and Applied Medical Sciences, Ghent University, Ghent, Belgium.
| | - Charlotte Windels
- Department of General Practice and Primary Health Care, Ghent University, Ghent, Belgium
| | - Evelien Snauwaert
- Department of Pediatric Nephrology, Ghent University Hospital, Ghent, Belgium
| | - Tatjana Van Der Heggen
- Faculty of Medicine and Health Sciences, Department of Basic and Applied Medical Sciences, Ghent University, Ghent, Belgium
| | - Annick de Jaeger
- Department of Pediatric Intensive Care, Pediatric Intensive Care 1K12D, Ghent University Hospital, C. Heymanslaan 10, 9000, Ghent, Belgium
| | - Laura Dhondt
- Faculty of Veterinary Medicine, Department of Pathobiology, Pharmacology and Zoological Medicine, Ghent University, Ghent, Belgium
| | - Joris Delanghe
- Faculty of Medicine and Health Sciences, Department of Diagnostic Sciences, Ghent University, Ghent, Belgium
| | - Siska Croubels
- Faculty of Veterinary Medicine, Department of Pathobiology, Pharmacology and Zoological Medicine, Ghent University, Ghent, Belgium
| | - Johan Vande Walle
- Department of Pediatric Nephrology, Ghent University Hospital, Ghent, Belgium
| | - Peter De Paepe
- Faculty of Medicine and Health Sciences, Department of Basic and Applied Medical Sciences, Ghent University, Ghent, Belgium
- Department of Pharmacy, Ghent University Hospital, Ghent, Belgium
| | - Pieter A De Cock
- Department of Pediatric Intensive Care, Pediatric Intensive Care 1K12D, Ghent University Hospital, C. Heymanslaan 10, 9000, Ghent, Belgium
- Faculty of Medicine and Health Sciences, Department of Basic and Applied Medical Sciences, Ghent University, Ghent, Belgium
- Department of Pharmacy, Ghent University Hospital, Ghent, Belgium
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Rummell LM, Steele MA, Templeman JR, Yohe TT, Akhtar N, Lambie JG, Singh P, Asquith T, Verbrugghe A, Pearson W, Shoveller AK. A proof of principle study investigating the effects of supplemental concentrated brewer's yeast on markers of gut permeability, inflammation, and fecal metabolites in healthy non-challenged adult sled dogs. J Anim Sci 2022; 100:skac281. [PMID: 36029013 PMCID: PMC9645558 DOI: 10.1093/jas/skac281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Accepted: 08/26/2022] [Indexed: 11/13/2022] Open
Abstract
Yeast-derived β-glucans impact immunity, though their effects on gut permeability and inflammation are less understood. Most research has investigated other components of the yeast cell wall, such as the prebiotic mannan- and fructo-oligosaccharides. The objective of this study was to assess the effects of feeding a concentrated yeast product on markers of inflammation (serum amyloid A [SAA] and haptoglobin [Hp]) and oxidative status (malondialdehyde [MDA]), fecal products of fermentation, and gut permeability. Nineteen privately owned domestic Siberian huskies, and one Alaskan husky (9 females: 5 intact, 4 spayed; 11 males: 3 intact, 8 neutered), with an average age of 4.8 ± 2.6 yr and body weight (BW) of 25.6 ± 4.1 kg, were used in this study. Dogs were blocked and randomly allocated to one of two diet groups. Ten dogs received a dry extruded diet. The other 10 received the same diet top dressed with yeast for a daily β-glucan dose of 7 mg/kg BW for 10 wk. Fecal collection, for evaluation of fecal metabolites, and scoring occurred weekly. Gut permeability was assessed using the chromium-labeled ethylenediamine tetra-acetic acid (Cr-EDTA) and iohexol markers prior to the initiation of dietary treatment and after 10 wk of treatment. Blood samples were collected premarker administration and 0.5, 1, 2, 3, 4, 5, and 6 h postadministration. Fasting concentrations of SAA, Hp, and MDA were measured on weeks -1, 2, 4, and 8. Incremental area under the curve (I-AUC) was calculated for serum iohexol and Cr-EDTA concentrations. All data were analyzed using PROC GLIMMIX of SAS with dog as random effect, and week as fixed effect and repeated measure. Dogs receiving treatment tended to have decreased I-AUC of Iohexol (P = 0.10) and Cr-EDTA (P = 0.06) between baseline and cessation of treatment compared to the change over time in I-AUC for control (Ctl) dogs. Treatment dogs had lower Hp concentrations (P ≤ 0.05) than Ctl. There were no differences between treatments for SAA and MDA concentrations (P > 0.05). Fecal arabinose concentrations were greater in treatment (Trt) dogs (P ≤ 0.05) compared to Ctl, though no other fecal metabolites were affected by treatment. There was no difference in the relative frequency of defecations scored at any fecal score between Trt and Ctl dogs, and mean score did not differ between groups (P > 0.10). These data suggest that concentrated brewer's yeast may have the potential to reduce gut permeability without impacting inflammatory status and markers of health in adult dogs.
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Affiliation(s)
- Lindsey M Rummell
- Department of Animal Biosciences, Ontario Agricultural College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Michael A Steele
- Department of Animal Biosciences, Ontario Agricultural College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - James R Templeman
- Department of Animal Biosciences, Ontario Agricultural College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
- Primal Pet Foods, Primal Pet Group, Fairfield, CA, 94534USA
| | - Taylor T Yohe
- Department of Animal Biosciences, Ontario Agricultural College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Nadeem Akhtar
- Department of Animal Biosciences, Ontario Agricultural College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Jocelyn G Lambie
- Department of Animal Biosciences, Ontario Agricultural College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Pawanpreet Singh
- Department of Animal Biosciences, Ontario Agricultural College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | | | - Adronie Verbrugghe
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, N1G 2W1Canada
| | - Wendy Pearson
- Department of Animal Biosciences, Ontario Agricultural College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Anna K Shoveller
- Department of Animal Biosciences, Ontario Agricultural College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
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Melsom T, Norvik JV, Enoksen IT, Stefansson V, Mathisen UD, Fuskevåg OM, Jenssen TG, Solbu MD, Eriksen BO. Sex Differences in Age-Related Loss of Kidney Function. J Am Soc Nephrol 2022; 33:1891-1902. [PMID: 35977806 PMCID: PMC9528336 DOI: 10.1681/asn.2022030323] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 06/08/2022] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND CKD is more prevalent in women, but more men receive kidney replacement therapy for kidney failure. This apparent contradiction is not well understood. METHODS We investigated sex differences in the loss of kidney function and whether any sex disparities could be explained by comorbidity or CKD risk factors. In the Renal Iohexol Clearance Survey (RENIS) in northern Europe, we recruited 1837 persons (53% women, aged 50-62 years) representative of the general population and without self-reported diabetes, CKD, or cardiovascular disease. Participants' GFR was measured by plasma iohexol clearance in 2007-2009 (n=1627), 2013-2015 (n=1324), and 2018-2020 (n=1384). At each study visit, healthy persons were defined as having no major chronic diseases or risk factors for CKD. We used generalized additive mixed models to assess age- and sex-specific GFR decline rates. RESULTS Women had a lower GFR than men at baseline (mean [SD], 90.0 [14.0] versus 98.0 [13.7] ml/min per 1.73 m2; P<0.001). The mean GFR change rate was -0.96 (95% confidence interval [CI], -0.88 to -1.04) ml/min per 1.73 m2 per year in women and -1.20 (95% confidence interval [CI], -1.12 to -1.28) in men. Although the relationship between age and GFR was very close to linear in women, it was curvilinear in men, with steeper GFR slopes at older ages (nonlinear effect; P<0.001). Healthy persons had a slower GFR decline, but health status did not explain the sex difference in the GFR decline. CONCLUSION Among middle-aged and elderly individuals in the general population, decline in the mean GFR in women was slower than in men, independent of health status.
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Affiliation(s)
- Toralf Melsom
- Section of Nephrology, University Hospital of North Norway, Tromsø, Norway
- Metabolic and Renal Research Group, UiT Arctic University of Norway, Tromsø, Norway
| | - Jon Viljar Norvik
- Section of Nephrology, University Hospital of North Norway, Tromsø, Norway
- Metabolic and Renal Research Group, UiT Arctic University of Norway, Tromsø, Norway
| | | | - Vidar Stefansson
- Metabolic and Renal Research Group, UiT Arctic University of Norway, Tromsø, Norway
| | | | - Ole Martin Fuskevåg
- Department of Laboratory Medicine, University Hospital of North Norway, Tromsø, Norway
| | - Trond G. Jenssen
- Metabolic and Renal Research Group, UiT Arctic University of Norway, Tromsø, Norway
- Department of Transplant Medicine, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Marit D. Solbu
- Section of Nephrology, University Hospital of North Norway, Tromsø, Norway
- Metabolic and Renal Research Group, UiT Arctic University of Norway, Tromsø, Norway
| | - Bjørn O. Eriksen
- Section of Nephrology, University Hospital of North Norway, Tromsø, Norway
- Metabolic and Renal Research Group, UiT Arctic University of Norway, Tromsø, Norway
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Abstract
Drug-induced anaphylaxis is a fatal medical condition whose incidence has been increasing continuously. Due to differences between genetic backgrounds and health care systems, different populations may be prone to various causative drugs. Using the Health Insurance Service and Assessment Service database, we investigated culprit drugs for drug-induced anaphylaxis and common medication risk factors in the Korean general population. We collected medical prescription histories within 3 days prior to anaphylaxis between January 2011 and December 2019 from the HIRA database. Designed as a case-crossover study, the attributable visits (case visits) were matched to medical visits (control visits) with the drug sets for each visit. We collected a list of medication risk factors for anaphylaxis and calculated the risk ratio of each agent using the chi-square test and conditional logistic regression analysis. A total of 159,473 individuals were listed in the database with a diagnosis of anaphylaxis in the HIRA from 2011 to 2019. After evaluating the suitability of control visits for matching with a case visit, 8168 subjects and 767 drugs were analyzed. The chi-square analysis identified 31 drugs as potential risk factors for drug-induced anaphylaxis in Korea. After applying a conditional logistic regression analysis for each agent, 5 drugs were found to be the common medication risk factors for drug-induced anaphylaxis: cefaclor, iopromide, iohexol, iomeprol, and tolperisone. We found 5 medication risk factors that showed the highest risk of drug-induced anaphylaxis and their degree of risk using an objective methodology in the Korean general population.
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Affiliation(s)
- Kyung-Min Ahn
- Division of Allergy and Clinical Immunology, Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
- Institute of Allergy and Clinical Immunology, Seoul National University Medical Research Center, Seoul, Korea
| | - Byung-Keun Kim
- Division of Pulmonology, Allergy and Critical Care Medicine, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
| | - Min-Suk Yang
- Division of Allergy and Clinical Immunology, Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
- Institute of Allergy and Clinical Immunology, Seoul National University Medical Research Center, Seoul, Korea
- Department of Internal Medicine, SMG-SNU Boramae Medical Center, Seoul, Korea
- *Correspondence: Min-Suk Yang, Division of Allergy and Clinical Immunology, Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea (e-mail: )
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Bomfim SA, Dória AR, Gonzaga IMD, Oliveira RVM, Romão LPC, Salazar-Banda GR, Ferreira LFR, Eguiluz KIB. Toward efficient electrocatalytic degradation of iohexol using active anodes: A laser-made versus commercial anodes. Chemosphere 2022; 299:134350. [PMID: 35331750 DOI: 10.1016/j.chemosphere.2022.134350] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2021] [Revised: 03/14/2022] [Accepted: 03/15/2022] [Indexed: 06/14/2023]
Abstract
The X-ray iodinated contrast medium iohexol is frequently detected in aquatic environments due to its high persistence and the inefficiency of its degradation by conventional wastewater treatments. Hence, the challenge faced in this study is the development of an alternative electrochemical treatment using active anodes. We investigate the oxidation of iohexol (16.42 mg L-1) using different operating conditions, focusing on the role of different mixed metal oxide anodes in the treatment efficiency. The electrocatalytic efficiency of the Ti/RuO2-TiO2 anode prepared using a CO2 laser heating and an ionic liquid is compared with Ti/RuO2-TiO2-IrO2 and Ti/IrO2-Ta2O5 commercial anodes. The hypochlorite ions generated by the anodes are also analyzed. The effect of the electrolyte composition (NaCl, Na2SO4, and NaClO4) and current density (15, 30, and 50 mA cm-2) on the iohexol degradation is also studied. The Ti/RuO2-TiO2 laser-made anode is more efficient than the commercial anodes. After optimizing experimental parameters, this anode removes 95.5% of iohexol in 60 min and displays the highest kinetic rate (0.059 min-1) with the lowest energy consumption per order (0.21 kWh m-3order-1), using NaCl solution as the electrolyte and applying 15 mA cm-2. Additionally, iohexol-intensified groundwater was used to compare the efficiency of anodes. The Ti/RuO2-TiO2 is also more efficient in removing the organic charge from the real water matrix (21.7% TOC) than the commercial anodes. Notably, the iohexol removal achieved is higher than all electrochemical treatments already reported using state-of-the-art non-active anodes in lower electrolysis time. Therefore, data from this study indicate that the electrochemical degradation of iohexol using the Ti/RuO2-TiO2 anode is efficient and has excellent cost-effectiveness; thus, it is a promising approach in the degradation of iohexol from wastewater. Furthermore, the Ti/RuO2-TiO2 active anode is competitive and can be an excellent option for treating effluents contaminated with recalcitrant organic compounds such as iohexol.
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Affiliation(s)
- Sthefany A Bomfim
- Electrochemistry and Nanotechnology Laboratory, Institute of Technology and Research (ITP), 49032-490, Aracaju-SE, Brazil; Waste and Effluent Treatment Laboratory, Institute of Technology and Research (ITP), 49032-490, Aracaju-SE, Brazil; Graduate Program in Process Engineering (PEP), Tiradentes University, 49032-490, Aracaju-SE, Brazil
| | - Aline R Dória
- Electrochemistry and Nanotechnology Laboratory, Institute of Technology and Research (ITP), 49032-490, Aracaju-SE, Brazil; Graduate Program in Process Engineering (PEP), Tiradentes University, 49032-490, Aracaju-SE, Brazil
| | - Isabelle M D Gonzaga
- Electrochemistry and Nanotechnology Laboratory, Institute of Technology and Research (ITP), 49032-490, Aracaju-SE, Brazil; Graduate Program in Process Engineering (PEP), Tiradentes University, 49032-490, Aracaju-SE, Brazil
| | | | - Luciane P C Romão
- Study of Natural Organic Matter Laboratory, Federal University of Sergipe, 49100-000, São Cristovão-SE, Brazil; Institute of Chemistry, UNESP, National Institute of Alternative Technologies for Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactive Materials (INCT-DATREM), P.O. Box 355, 14800-900, Araraquara-SP, Brazil
| | - Giancarlo R Salazar-Banda
- Electrochemistry and Nanotechnology Laboratory, Institute of Technology and Research (ITP), 49032-490, Aracaju-SE, Brazil; Graduate Program in Process Engineering (PEP), Tiradentes University, 49032-490, Aracaju-SE, Brazil
| | - Luiz F R Ferreira
- Waste and Effluent Treatment Laboratory, Institute of Technology and Research (ITP), 49032-490, Aracaju-SE, Brazil; Graduate Program in Process Engineering (PEP), Tiradentes University, 49032-490, Aracaju-SE, Brazil.
| | - Katlin I B Eguiluz
- Electrochemistry and Nanotechnology Laboratory, Institute of Technology and Research (ITP), 49032-490, Aracaju-SE, Brazil; Graduate Program in Process Engineering (PEP), Tiradentes University, 49032-490, Aracaju-SE, Brazil.
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Abstract
BACKGROUND Therapeutic drug monitoring (TDM) aims at individualising a dosage regimen and is increasingly being performed by estimating individual pharmacokinetic parameters via empirical Bayes estimates (EBEs). However, EBEs suffer from shrinkage that makes them biased. This bias is a weakness for TDM and probably a barrier to the acceptance of drug dosage adjustments by prescribers. OBJECTIVE The aim of this article is to propose a methodology that allows a correction of EBE shrinkage and an improvement in their precision. METHODS As EBEs are defined, they can be seen as a special case of ridge estimators depending on a parameter usually denoted λ. After a bias correction depending on λ, we chose λ so that the individual pharmacokinetic estimations have minimal imprecision. Our estimate is by construction always better than EBE with respect to bias (i.e. shrinkage) and precision. RESULTS We illustrate the performance of this approach with two different drugs: iohexol and isavuconazole. Depending on the patient's actual pharmacokinetic parameter values, the improvement given by our approach ranged from 0 to 100%. CONCLUSION This innovative methodology is promising since, to the best of our knowledge, no other individual shrinkage correction has been proposed.
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Affiliation(s)
- Sarah Baklouti
- INTHERES, UMR 1436, INRAE, ENVT, Université de Toulouse, Ecole Nationale Vétérinaire de Toulouse, 23 chemin des Capelles, B.P. 87617, 31076, Toulouse Cedex 3, France
- Laboratoire de Pharmacocinétique et Toxicologie Clinique, Institut Fédératif de Biologie, CHU de Toulouse, Toulouse, France
| | - Peggy Gandia
- INTHERES, UMR 1436, INRAE, ENVT, Université de Toulouse, Ecole Nationale Vétérinaire de Toulouse, 23 chemin des Capelles, B.P. 87617, 31076, Toulouse Cedex 3, France
- Laboratoire de Pharmacocinétique et Toxicologie Clinique, Institut Fédératif de Biologie, CHU de Toulouse, Toulouse, France
| | - Didier Concordet
- INTHERES, UMR 1436, INRAE, ENVT, Université de Toulouse, Ecole Nationale Vétérinaire de Toulouse, 23 chemin des Capelles, B.P. 87617, 31076, Toulouse Cedex 3, France.
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Wang S, Chen Z, Yan P, She T, Wang W, Bi L, Kang J, Shen J, Li X, Shen L, Cheng Y. Enhanced degradation of iohexol in water by CuFe 2O 4 activated peroxymonosulfate: Efficiency, mechanism and degradation pathway. Chemosphere 2022; 289:133198. [PMID: 34890616 DOI: 10.1016/j.chemosphere.2021.133198] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 12/03/2021] [Accepted: 12/04/2021] [Indexed: 06/13/2023]
Abstract
Iohexol as an iodinated X-ray contrast agent is widely used, and it is the potential precursor for toxic iodinated disinfection by-products in the disinfection process. In this study, a series of CuFe2O4 catalysts were prepared by sol-gel method with different molar ratios of total metal cations to citric acid ([Men+]T/CA) and employed as heterogeneous catalysts to activate peroxymonosulfate (PMS) for the removal of iohexol. The catalysts were characterized by various technologies, and the effect of [Men+]T/CA molar ratio on the catalysts' properties was explored. The CuFe2O4 synthesized with [Men+]T/CA molar ratio of 1:1 showed the best catalytic activity to PMS, and 95.0% of 1.0 mg/L iohexol was removed within 15 min by using 50 mg/L CuFe2O4 and 20 mg/L PMS. The quenching experiment and electron spin resonance (ESR) spectra indicated the generation of SO4- and OH in the CuFe2O4/PMS system, and the quantity experiments revealed that the generation concentration of SO4- was ten times higher than that of OH. The generation mechanism of SO4- and ·OH were investigated by ATR-FTIR and X-ray photoelectron spectroscopy (XPS) spectra. The effects of catalyst dosage, PMS and iohexol concentration on the removal of iohexol were studied, and various water matrix factors including solution pH, natural organic matter (NOM) concentration and inorganic ions were also considered. Based on the twelve intermediate products of iohexol detected by UPLC-QTOF/MS, the degradation pathway was proposed. The high catalytic activity and reusability of CuFe2O4 indicated that CuFe2O4 activating PMS is an effective and sustainable way for the treatment of iohexol.
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Affiliation(s)
- Shuyu Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Zhonglin Chen
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Pengwei Yan
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
| | - Tianhao She
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Weiqiang Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Lanbo Bi
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Jing Kang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
| | - Jimin Shen
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, PR China.
| | - Xueyan Li
- Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, PR China
| | - Linlu Shen
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Yizhen Cheng
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
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Yang J, Sun Q, Huang C, Qin S, Han S, Huo Z, Li Y, Sun X, Chen J. 3-Aminophenylboronic acid-mediated aggregation of gold nanoparticles for colorimetric sensing of iohexol in environmental and biological samples. Spectrochim Acta A Mol Biomol Spectrosc 2021; 261:120004. [PMID: 34098478 DOI: 10.1016/j.saa.2021.120004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 05/13/2021] [Accepted: 05/23/2021] [Indexed: 06/12/2023]
Abstract
Iohexol (IHO), as one of iodinated X-ray contrast, is often used as not only a chemical marker for tracking wastewater contamination in aquatic environment, but also an ideal glomerular filtration rate marker for explorating kidney disease. To these aims, it is important to establish reliable, fast, and cheap methods to detect IHO in environmental and biological samples. This work describes for the first time the development of a selective, sensitive and reliable colorimetric sensing assay for the fast determination of IHO in environmental and biological samples based on 3-aminophenylboronic acid (3-APBA) mediated aggregation of gold nanoparticles (AuNPs). In this approach, 3-APBA can assemble on the AuNPs surface through electrostatic interaction between its amino groups with the negatively charged citrate stabilizer of AuNPs to form AuNP@3-APBA. Subsequently, the aggregation and visual color change of the assembled AuNP@3-APBA are induced by the covalent reaction between boronic acid ligands of 3-APBA and cis-diols of IHO. The developed assay presented a very simple operating procedure and a rapid analysis time of around 10 min. The developed assay also exhibited good selectivity and a low limit of detection (LOD) of 0.005 mM for detecting IHO. Moreover, the developed assay showed comparable accuracy and precision to the high-performance liquid chromatography-diode array detector (HPLC-DAD) method when used for the rapid determination of IHO in river water and human urine samples. The recoveries of IHO at three spiking levels were in the range of 91.5-106.3% with relative standard deviation (RSD) values below 6.39%.
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Affiliation(s)
- Jiajia Yang
- College of Materials Science and Engineering, Hebei University of Engineering, 19 Taiji Road, Handan 056038, China
| | - Qingye Sun
- College of Materials Science and Engineering, Hebei University of Engineering, 19 Taiji Road, Handan 056038, China
| | - Chaonan Huang
- School of Environmental and Municipal Engineering, Qingdao University of Technology, 11 Fushun Road, Qingdao 266033, China
| | - Shenjun Qin
- College of Materials Science and Engineering, Hebei University of Engineering, 19 Taiji Road, Handan 056038, China
| | - Shuai Han
- College of Materials Science and Engineering, Hebei University of Engineering, 19 Taiji Road, Handan 056038, China
| | - Zhongchao Huo
- Second Department of Oncology, Affiliated Hospital of Hebei University of Engineering, 81 Congtai Road, Handan 056002, China
| | - Yun Li
- CAS Key Laboratory of Separation Sciences for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China.
| | - Xiaoli Sun
- Department of Chemistry, Lishui University, 1 Xueyuan Road, Lishui 323000, China
| | - Jiping Chen
- CAS Key Laboratory of Separation Sciences for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
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Costa AF, Peet K. Contrast media injection protocol for portovenous phase abdominal CT: does a fixed injection duration improve hepatic enhancement over a fixed injection rate? Abdom Radiol (NY) 2021; 46:2968-2975. [PMID: 33386915 DOI: 10.1007/s00261-020-02919-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 12/10/2020] [Accepted: 12/12/2020] [Indexed: 11/28/2022]
Abstract
PURPOSE To assess whether a fixed contrast media (CM) injection duration improves the magnitude and inter-patient variability in hepatic enhancement over a fixed injection rate. METHODS Outpatients who underwent portovenous phase abdominal CT (fixed duration, February-November 2018; fixed rate, January-July 2020) with 1.22 mL/kg iohexol 350 were included. Subjects with liver, kidney or heart disease were excluded. The number of subjects and injection protocols were as follows: fixed duration arm, 56 women, 60 men, 35 s injection duration; fixed rate arm, 66 women, 62 men, 3 mL/s injection rate. Liver attenuation measurements were obtained from regions of interest on pre- and post-contrast images. Mean hepatic enhancement (MHE) and MHE normalized to iodine dose (MHE/I) were compared (unpaired t-tests and F-tests). RESULTS There was no statistically significant difference in age, weight, body mass index or CM dosing (p > 0.05). Enhancement indices were significantly lower in the fixed rate group as compared to the fixed duration group, as follows: MHE, 50.0 ± 12 vs. 54.8 ± 11 HU (p = 0.001); and MHE/I, 1.53 ± 0.43 vs. 1.66 ± 0.51 HU/g, (p = 0.04). However, there was no significant difference in the variances of MHE (p = 0.51) and MHE/I (p = 0.08). CONCLUSION A fixed CM injection duration yields a greater magnitude in hepatic enhancement indices than a fixed injection rate. Inter-patient variability in hepatic enhancement indices do not significantly differ between the two injection protocols.
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Affiliation(s)
- Andreu F Costa
- Department of Diagnostic Radiology, Queen Elizabeth II Health Sciences Centre and Dalhousie University, Victoria General Building, 3rd floor, 1276 South Park Street, Halifax, NS, B3H 2Y9, Canada.
| | - Kris Peet
- Department of Diagnostic Radiology, Queen Elizabeth II Health Sciences Centre and Dalhousie University, Victoria General Building, 3rd floor, 1276 South Park Street, Halifax, NS, B3H 2Y9, Canada
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Inker LA, Couture SJ, Tighiouart H, Abraham AG, Beck GJ, Feldman HI, Greene T, Gudnason V, Karger AB, Eckfeldt JH, Kasiske BL, Mauer M, Navis G, Poggio ED, Rossing P, Shlipak MG, Levey AS. A New Panel-Estimated GFR, Including β 2-Microglobulin and β-Trace Protein and Not Including Race, Developed in a Diverse Population. Am J Kidney Dis 2021; 77:673-683.e1. [PMID: 33301877 PMCID: PMC8102017 DOI: 10.1053/j.ajkd.2020.11.005] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 11/10/2020] [Indexed: 12/20/2022]
Abstract
RATIONALE AND OBJECTIVE Glomerular filtration rate (GFR) estimation based on creatinine and cystatin C (eGFRcr-cys) is more accurate than estimated GFR (eGFR) based on creatinine or cystatin C alone (eGFRcr or eGFRcys, respectively), but the inclusion of creatinine in eGFRcr-cys requires specification of a person's race. β2-Microglobulin (B2M) and β-trace protein (BTP) are alternative filtration markers that appear to be less influenced by race than creatinine is. STUDY DESIGN Study of diagnostic test accuracy. SETTING AND PARTICIPANTS Development in a pooled population of 7 studies with 5,017 participants with and without chronic kidney disease. External validation in a pooled population of 7 other studies with 2,245 participants. TESTS COMPARED Panel eGFR using B2M and BTP in addition to cystatin C (3-marker panel) or creatinine and cystatin C (4-marker panel) with and without age and sex or race. OUTCOMES GFR measured as the urinary clearance of iothalamate, plasma clearance of iohexol, or plasma clearance of [51Cr]EDTA. RESULTS Mean measured GFRs were 58.1 and 83.2 mL/min/1.73 m2, and the proportions of Black participants were 38.6% and 24.0%, in the development and validation populations, respectively. In development, addition of age and sex improved the performance of all equations compared with equations without age and sex, but addition of race did not further improve the performance. In validation, the 4-marker panels were more accurate than the 3-marker panels (P < 0.001). The 3-marker panel without race was more accurate than eGFRcys (percentage of estimates greater than 30% different from measured GFR [1 - P30] of 15.6% vs 17.4%; P = 0.01), and the 4-marker panel without race was as accurate as eGFRcr-cys (1 - P30 of 8.6% vs 9.4%; P = 0.2). Results were generally consistent across subgroups. LIMITATIONS No representation of participants with severe comorbid illness and from geographic areas outside of North America and Europe. CONCLUSIONS The 4-marker panel eGFR is as accurate as eGFRcr-cys without requiring specification of race. A more accurate race-free eGFR could be an important advance.
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Affiliation(s)
- Lesley A Inker
- Division of Nephrology, Tufts Medical Center; Tufts Clinical and Translational Science Institute, Tufts University, Boston, MA.
| | - Sara J Couture
- Division of Nephrology, Tufts Medical Center; Tufts Clinical and Translational Science Institute, Tufts University, Boston, MA
| | - Hocine Tighiouart
- Institute for Clinical Research and Health Policy Studies, Tufts Medical Center; Tufts Clinical and Translational Science Institute, Tufts University, Boston, MA; Tufts Medical Center; Tufts Clinical and Translational Science Institute, Tufts University, Boston, MA
| | - Alison G Abraham
- Department of Epidemiology, John Hopkins Bloomberg School of Public Health, Baltimore, MD
| | - Gerald J Beck
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, OH
| | - Harold I Feldman
- Department of Biostatistics, Epidemiology, and Informatics, University of Pennsylvania, Philadelphia, PA
| | - Tom Greene
- Department of Internal Medicine, University of Utah Health, Salt Lake City, UT
| | - Vilmundur Gudnason
- Faculty of Medicine, University of Iceland, Reykjavik, Iceland; Icelandic Heart Association, Kopavogur, Iceland
| | - Amy B Karger
- Departments of Laboratory Medicine and Pathology, University of Minnesota; Department of Medicine, Hennepin County Medical Center, Minneapolis, MN
| | - John H Eckfeldt
- Departments of Laboratory Medicine and Pathology, University of Minnesota; Department of Medicine, Hennepin County Medical Center, Minneapolis, MN
| | - Bertram L Kasiske
- University of Minnesota; Department of Medicine, Hennepin County Medical Center, Minneapolis, MN
| | - Michael Mauer
- Medicine, University of Minnesota; Department of Medicine, Hennepin County Medical Center, Minneapolis, MN
| | - Gerjan Navis
- Faculty of Medical Sciences, University Medical Center Groningen, Groningen, The Netherlands
| | - Emilio D Poggio
- Department of Nephrology and Hypertension, Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, OH
| | - Peter Rossing
- Steno Diabetes Center Copenhagen and Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Michael G Shlipak
- Kidney Health Research Collaborative, San Francisco Veterans Affairs Medical Center, University of California, San Francisco, CA
| | - Andrew S Levey
- Division of Nephrology, Tufts Medical Center; Tufts Clinical and Translational Science Institute, Tufts University, Boston, MA
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Pierce CB, Muñoz A, Ng DK, Warady BA, Furth SL, Schwartz GJ. Age- and sex-dependent clinical equations to estimate glomerular filtration rates in children and young adults with chronic kidney disease. Kidney Int 2021; 99:948-956. [PMID: 33301749 PMCID: PMC9083470 DOI: 10.1016/j.kint.2020.10.047] [Citation(s) in RCA: 133] [Impact Index Per Article: 44.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 10/09/2020] [Accepted: 10/30/2020] [Indexed: 11/19/2022]
Abstract
Using data (2655 observations from 928 participants) from the Chronic Kidney Disease in Children Study, we developed and internally validated new glomerular filtration rate estimating equations for clinical use in children and young adults: two forms of K × [heigh(ht) / serum creatinine(sCr)] and two forms of K × [1 / cystatin C(cysC)]. For each marker, one equation used a sex-dependent K; in the other, K is sex-and age-dependent. Glomerular filtration rate (GFR) was measured directly by plasma iohexol disappearance. The equations using ht⁄sCr had sex-specific constants of 41.8 for males and 37.6 for females. In the age- dependent models, K increased monotonically for children 1-18 years old and was constant for young adults 18-25 years. For males, K ranged from 35.7 for one-year-olds to 50.8 for those 18 and older. For females, the values of K ranged from 33.1 to 41.4. Constant K values for cystatin-C equations were 81.9 for males and 74.9 for females. With age-dependency, K varied non-monotonically with the highest values at age 15 for males (K of 87.2) and 12 years for females (K of 79.9). Use of an age-dependent K with ht/sCr models reduced average bias, notably in young children and young adults; age-dependent cystatin-C models produced similar agreement to using a constant K in children under 18 years, but reduced bias in young adults. These age-dependent proposed equations were evaluated alongside estimated GFRs from 11 other published equations for pediatrics and young adults. Only our proposed equations yielded non- significant bias and within 30% accuracy values greater than 85% in both the pediatric and young adult subpopulations.
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Affiliation(s)
- Christopher B Pierce
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.
| | - Alvaro Muñoz
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Derek K Ng
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Bradley A Warady
- Division of Pediatric Nephrology, Children's Mercy Kansas City, Kansas City, Missouri, USA
| | - Susan L Furth
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, and Division of Nephrology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - George J Schwartz
- Department of Pediatrics, Pediatric Nephrology, University of Rochester Medical Center, Rochester, New York, USA
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Currin S, Gondwe M, Mayindi N, Chipungu S, Khoza B, Khambule L, Snyman T, Tollman S, Fabian J, George J. Evaluating chronic kidney disease in rural South Africa: comparing estimated glomerular filtration rate using point-of-care creatinine to iohexol measured GFR. Clin Chem Lab Med 2021; 59:1409-1420. [PMID: 33711217 DOI: 10.1515/cclm-2020-1882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Accepted: 03/03/2021] [Indexed: 11/15/2022]
Abstract
OBJECTIVES The prevalence of chronic kidney disease is rising rapidly in low- and middle-income countries. Serum creatinine and estimation of glomerular filtration rate (GFR) are critical diagnostic tools, yet access to centralised laboratory services remains limited in primary care resource-limited settings. The aim of this study was to evaluate point-of-care (POC) technologies for serum creatinine measurement and to compare their performance to a gold standard measurement using iohexol measured GFR (mGFR). METHODS POC creatinine was measured using iSTAT® and StatSensor® devices in capillary and venous whole blood, and laboratory creatinine was measured using the compensated kinetic Jaffe method in 670 participants from a rural area in South Africa. GFR estimating equations Chronic Kidney Disease Epidemiology Collaboration and Modification of Diet in Renal Disease (CKD-EPI and MDRD) for POC and laboratory creatinine were compared to iohexol mGFR. RESULTS Calculated GFR for laboratory and POC creatinine measurements overestimated GFR (positive bias of 1.9-34.1 mL/min/1.73 m2). However, all POC devices had less positive bias than the laboratory Jaffe method (1.9-14.7 vs. 34.1 for MDRD, and 8.4-19.9 vs. 28.6 for CKD-EPI). Accuracy within 30% of mGFR ranged from 0.56 to 0.72 for POC devices and from 0.36 to 0.43 for the laboratory Jaffe method. POC devices showed wider imprecision with coefficients of variation ranging from 4.6 to 10.2% compared to 3.5% for the laboratory Jaffe method. CONCLUSIONS POC estimated GFR (eGFR) showed improved performance over laboratory Jaffe eGFR, however POC devices suffered from imprecision and large bias. The laboratory Jaffe method performed poorly, highlighting the need for laboratories to move to enzymatic methods to measure creatinine.
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Affiliation(s)
- Sean Currin
- Department of Chemical Pathology, University of Witwatersrand, Johannesburg, South Africa
- Department of Chemical Pathology, National Health Laboratory Service, Johannesburg, South Africa
| | - Mwawi Gondwe
- Medical Research Council/Wits University Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, Faculty of Health Sciences, University of Witwatersrand, Johannesburg, South Africa
| | - Nokthula Mayindi
- Medical Research Council/Wits University Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, Faculty of Health Sciences, University of Witwatersrand, Johannesburg, South Africa
| | - Shingirai Chipungu
- Medical Research Council/Wits University Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, Faculty of Health Sciences, University of Witwatersrand, Johannesburg, South Africa
| | - Bongekile Khoza
- Medical Research Council/Wits University Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, Faculty of Health Sciences, University of Witwatersrand, Johannesburg, South Africa
| | - Lungile Khambule
- Department of Chemical Pathology, University of Witwatersrand, Johannesburg, South Africa
| | - Tracy Snyman
- Department of Chemical Pathology, University of Witwatersrand, Johannesburg, South Africa
- Department of Chemical Pathology, National Health Laboratory Service, Johannesburg, South Africa
| | - Stephen Tollman
- Medical Research Council/Wits University Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, Faculty of Health Sciences, University of Witwatersrand, Johannesburg, South Africa
- International Network for the Demographic Evaluation of Populations and their Health (INDEPTH) Network, Accra, Ghana
| | - June Fabian
- Medical Research Council/Wits University Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, Faculty of Health Sciences, University of Witwatersrand, Johannesburg, South Africa
- Wits Donald Gordon Medical Centre, School of Clinical Medicine, Faculty of Health Sciences, University of Witwatersrand, Johannesburg, South Africa
| | - Jaya George
- Department of Chemical Pathology, University of Witwatersrand, Johannesburg, South Africa
- Department of Chemical Pathology, National Health Laboratory Service, Johannesburg, South Africa
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Yan P, Chen Z, Wang S, Zhou Y, Li L, Yuan L, Shen J, Jin Q, Zhang X, Kang J. Catalytic ozonation of iohexol with α-Fe 0.9Mn 0.1OOH in water: Efficiency, degradation mechanism and toxicity evaluation. J Hazard Mater 2021; 402:123574. [PMID: 32759003 DOI: 10.1016/j.jhazmat.2020.123574] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 07/10/2020] [Accepted: 07/22/2020] [Indexed: 06/11/2023]
Abstract
Iohexol, a widely used iodinated X-ray contrast media, is difficult to completely degrade with the traditional water treatment process. Catalytic ozonation with synthesized α-Fe0.9Mn0.1OOH as the catalyst can significantly promote the degradation of iohexol relative to that with ozonation alone. Hydroxyl radicals play a predominant role during the degradation of iohexol. The effect of various factors, including catalyst dose, ozone dose, iohexol concentration and water matrix factors, on the catalytic performance were investigated. The presence of α-Fe0.9Mn0.1OOH in the catalytic system can significantly promote the removal of iohexol and mineralization of the dissolved organic carbon in real water samples. The intermediate products were determined by high-resolution liquid chromatography, and the reaction site was predicted by frontier electron density (FED) calculations. The degradation mechanism of iohexol followed the processes of H-abstraction, amide hydrolysis, amide oxidation, and ·OH substitution. Higher exposure concentrations of iohexol had a negative effect on the survival and hatching rates in the development of zebrafish embryos. The autonomic movement process and heartbeat rate of the zebrafish larvae showed significant differences as the exposure concentration of iohexol increased. The catalytic ozonation process with α-Fe0.9Mn0.1OOH can decrease the toxicity of iohexol containing water.
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Affiliation(s)
- Pengwei Yan
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Zhonglin Chen
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Shuyu Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Yanchi Zhou
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Li Li
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; School of Life Science and Technology, Harbin Institute of Technology, Harbin 150080, PR China
| | - Lei Yuan
- National and Provincial Joint Engineering Laboratory of Wetland Ecological Conservation, Heilongjiang Academy of Science, Harbin, 150040, PR China
| | - Jimin Shen
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
| | - Qianqian Jin
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Xiaoxiao Zhang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Jing Kang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
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Grin AA, Kasatkin DS, Karanadze VA, Shtadler VD. [Spinal motor segment labeling with a mixture of n-butyl-2-cyanoacrylate and iohexol in determining the level of thoracic spine surgery]. Zh Vopr Neirokhir Im N N Burdenko 2021; 85:62-67. [PMID: 34951761 DOI: 10.17116/neiro20218506162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
UNLABELLED Erroneous determining the level of spine surgery is an urgent problem in modern vertebrology. Incidence of this complication is up to 1 per 3110 patients, among patients undergoing thoracic spine surgery - 1 per 25 patients. Despite widespread use of spine surgery, there is still no standard rational method for prevention of erroneous determining the level of intervention. OBJECTIVE To develop a safe minimally invasive low-traumatic and cost-effective method for preoperative marking the level of thoracic spine surgery. MATERIAL AND METHODS A mixture of biodegradable adhesive based on cyanoacrylate and water-soluble iodine-containing X-ray contrast agent was used for preoperative marking in 8 patients scheduled for thoracic spine and spinal cord surgery. This mixture was injected into paravertebral tissues at the level of further intervention. RESULTS Preoperative marking ensured a fixed and clearly visible landmark during intraoperative fluoroscopy in 7 patients. In 1 patient, mixture spread in paravertebral soft tissues that did not allow us to obtain appropriate landmark during intraoperative radiography. CONCLUSION The described method makes it possible to create an immobile X-ray-positive «mark» in paravertebral soft tissues, which can be used to control the level of intervention at all surgical stages.
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Affiliation(s)
- A A Grin
- Sklifosovsky Research Institute for Emergency Care, Moscow, Russia
- Evdokimov Moscow State University of Medicine and Dentistry, Moscow, Russia
| | - D S Kasatkin
- Evdokimov Moscow State University of Medicine and Dentistry, Moscow, Russia
| | - V A Karanadze
- Sklifosovsky Research Institute for Emergency Care, Moscow, Russia
| | - V D Shtadler
- Evdokimov Moscow State University of Medicine and Dentistry, Moscow, Russia
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Kang J, Oh D, Choi J, Kim K, Yoon J, Choi M. Evaluation of a dual-purpose contrast medium for radiography and ultrasonography of the small intestine in dogs. Am J Vet Res 2020; 81:950-957. [PMID: 33251836 DOI: 10.2460/ajvr.81.12.950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To evaluate a contrast medium that could be used for radiographic and ultrasonographic assessment of the small intestine in dogs. ANIMALS 8 healthy adult Beagles. PROCEDURES Carboxymethylcellulose (CMC; 0.5% solution) was combined with iohexol (300 mg of iodine/mL) to yield modified contrast medium (MCM). Dogs were orally administered the first of 3 MCMs (10 mL/kg [9.5 mL of CMC/kg plus 0.5 mL of iohexol/kg]). Radiographic and ultrasonographic assessment of the small intestine followed 10 minutes after administration and every 10 minutes thereafter, until MCM was seen within the ascending colon. Minimally, 1 week elapsed between dosing of subsequent MCMs (10 mL/kg [9 mL of CMC/kg plus 1 mL of iohexol/kg and 8.5 mL of CMC/kg plus 1.5 mL of iohexol/kg]) and repeated radiography and ultrasonography. RESULTS Radiographic contrast enhancement of the small intestine was best with MCM that combined 8.5 mL of CMC/kg and 1.5 mL of iohexol/kg. Mean small intestinal transit time for all MCMs was 86 minutes. All MCMs did not interfere with ultrasonographic assessment of the small intestine and may have improved visualization of the far-field small intestinal walls. CONCLUSIONS AND CLINICAL RELEVANCE An MCM that combined 8.5 mL of 0.5% CMC/kg and 1.5 mL of iohexol/kg could be an alternative to barium or iohexol alone for contrast small intestinal radiography in dogs, especially when abdominal ultrasonography is to follow contrast radiography.
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Park S, Jung JW, Je H, Jang Y, Choi J. Effect of slice thickness on computed tomographic perfusion analysis of the pancreas in healthy dogs. Am J Vet Res 2020; 81:732-738. [PMID: 33112168 DOI: 10.2460/ajvr.81.9.732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To evaluate the effect of slice thickness on CT perfusion analysis of the pancreas in healthy dogs. ANIMALS 12 healthy Beagles. PROCEDURES After precontrast CT scans, CT perfusion scans of the pancreatic body were performed every second for 30 seconds by sequential CT scanning after injection of contrast medium (iohexol; 300 mg of 1/kg) at a rate of 3 mL/s. Each dog underwent CT perfusion scans twice in a crossover-design study with 2 different slice thicknesses (2.4 and 4.8 mm). Computed tomographic pancreatic perfusion variables, including blood flow, blood volume determined with the maximum slope model, times to the start of enhancement and peak enhancement, permeability, and blood volume determined by Patlak plot analysis, were measured independently by 2 reviewers. The CT perfusion variables were compared between slice thicknesses. Interoperator reproducibility was determined by ICC calculation. RESULTS Interoperator reproducibility of CT perfusion variable measurements was excellent on 2.4-mm (mean ± SD ICC, 0.81 ± 0.17) and 4.8-mm (0.90 ± 0.07) slice thicknesses, except for time to peak pancreatic enhancement on 2.4-mm-thick slices, which had moderate reproducibility (intraclass correlation coefficient, 0.473). There was no significant difference in measurements of blood flow, blood volume by either method, times to the start and peak of pancreatic enhancement, or permeability between slice thicknesses. CONCLUSIONS AND CLINICAL RELEVANCE Results supported that a thin slice thickness of 2.4 mm can be used for assessment of pancreatic perfusion variables in healthy dogs.
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Yang S, Zhu W, Wang Z, Xiao Y, Mao P, Qu L, Hu Y, Wang J. Thermosensitive Liposomes Encapsulating Anti-Cancer Agent Lomustine, and Contrast Medium Iohexol, for Thermochemotherapy: Preparation, Characterization, and In Vivo Evaluation. J Nanosci Nanotechnol 2020; 20:6070-6076. [PMID: 32384954 DOI: 10.1166/jnn.2020.18590] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Thermosensitive liposome-based drug delivery systems (DDS) are powerful tools for site-specific delivery of chemotherapeutics, especially when combined with regional hyperthermia. The objective of this work was to develop a novel thermosensitive liposomal DDS loaded with lomustine, a chemotherapeutic compound, and iohexol, a contrast medium for visualization by CT. Thermosensitive compound liposomes (TSCLs) composed of DPPC were prepared by reverse-phase evaporation and investigated for encapsulation efficiency, temperature-sensitivity, release kinetics, and In Vivo pharmacokinetics. The size and zeta-potential of TSCLs ranged from 250 to 300 nm and -15 to -30 mV, respectively. At 41 °C, TSCLs were shown to release over 90% of iohexol and lomustine within 4 h. The in vitro release profiles of iohexol and lomustine at 41 °C conformed to first-order kinetics and Weibullmodel, respectively. Phase-transition did not occur after incorporation of cholesterol and soybean phospholipids. In Vivo evaluation performed with C6 glioma model rats proved the prolonged half-lives and improved bioavailability by liposomal encapsulation for both compounds under mild local hyperthermia. The TSCLs used in this study may offer a clinically promising mean of increasing efficacy and controlling toxicity.
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Affiliation(s)
- Shuoye Yang
- College of Bioengineering, Henan University of Technology, Zhengzhou 450001, China
| | - Wensheng Zhu
- Nanyang Hydrology and Water Resources Survey Bureau, Nanyang 473000, China
| | - Zhenwei Wang
- College of Bioengineering, Henan University of Technology, Zhengzhou 450001, China
| | - Yongmei Xiao
- College of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, China
| | - Pu Mao
- College of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, China
| | - Lingbo Qu
- College of Bioengineering, Henan University of Technology, Zhengzhou 450001, China
| | - Yuansen Hu
- College of Bioengineering, Henan University of Technology, Zhengzhou 450001, China
| | - Jinshui Wang
- College of Bioengineering, Henan University of Technology, Zhengzhou 450001, China
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