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Hansoti B, Hahn E, Rao A, Harris J, Jenson A, Markadakis N, Moonat S, Osula V, Pousson A. Calibrating a chief complaint list for low resource settings: a methodologic case study. Int J Emerg Med 2021; 14:32. [PMID: 34011284 PMCID: PMC8132346 DOI: 10.1186/s12245-021-00347-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 04/12/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The chief or presenting complaint is the reason for seeking health care, often in the patient's own words. In limited resource settings, a diagnosis-based approach to quantifying burden of disease is not possible, partly due to limited availability of an established lexicon or coding system. Our group worked with colleagues from the African Federation of Emergency Medicine building on the existing literature to create a pilot symptom list representing an attempt to standardize undifferentiated chief complaints in emergency and acute care settings. An ideal list for any setting is one that strikes a balance between ease of use and length, while covering the vast majority of diseases with enough detail to permit epidemiologic surveillance and make informed decisions about resource needs. METHODS This study was incorporated as a part of a larger prospective observational study on human immunodeficiency virus testing in Emergency Departments in South Africa. The pilot symptom list was used for chief complaint coding in three Emergency Departments. Data was collected on 3357 patients using paper case report forms. Chief complaint terms were reviewed by two study team members to determine the frequency of concordance between the coded chief complaint term and the selected symptom(s) from the pilot symptom list. RESULTS Overall, 3537 patients' chief complaints were reviewed, of which 640 were identified as 'potential mismatches.' When considering the 191 confirmed mismatches (29.8%), the Delphi process identified 6 (3.1%) false mismatches and 185 (96.9%) true mismatches. Significant chief-complaint clustering was identified with 9 sets of complaints frequently selected together for the same patient. "Pain" was used 2076 times for 58.7% of all patients. A combination of user feedback and expert-panel modified Delphi analysis of mismatched complaints and clustered complaints resulted in several substantial changes to the pilot symptom list. CONCLUSIONS This study presented a systematic methodology for calibrating a chief complaint list for the local context. Our revised list removed/reworded symptoms that frequently clustered together or were misinterpreted by health professionals. Recommendations for additions, modifications, and/or deletions from the pilot chief complaint list we believe will improve the functionality of the list in low resource environments.
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Sheu T, Park S, Rao A, Gans D, King R, Whitehead T, Swischuk J. Abstract No. 577 Basket thrombectomy using distal protection wires for arterial thromboembolism: a case series. J Vasc Interv Radiol 2021. [DOI: 10.1016/j.jvir.2021.03.387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Elhalawani H, Volpe S, Cardenas C, Stieb S, Rock C, Lin T, Yang P, Wu H, Barua S, Zaveri J, Elgohari B, Abdallah L, Jethanandani A, Mohamed A, Court L, Gunn G, Rosenthal D, Frank S, Garden A, Rao A, Hutcheson K, Fuller C. Investigation of Longitudinal Dose-weighted FDG-Positron Emission Tomography Metabolic Imaging Biomarkers (PET MIBs) of Radiation-associated Dysphagia in OPC Cohort. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2020.07.746] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Mitra S, Jajodia A, Koyyala V, Mahawar V, Dewan A, Aggarwal S, Wahi IS, Barik S, Dobriyal K, Mukhee J, Khurana H, Tripathy R, Rao A, Chaturvedi A. PH-0718: Quantitative MRI in prognosticating clinical outcomes in carcinoma cervix treated with Radiotherapy. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)00740-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Caissie A, Mierzwa M, Fuller C, Rajaraman M, Lin A, McDonald A, Popple R, Xiao Y, van Dijk L, Balter P, Fong H, Ping H, Kovoor M, Lee J, Rao A, Martel M, Thompson R, Merz B, Yao J, Mayo C. Radiotherapy (RT) Patterns Of Practice Variability Identified As A Challenge To Real-World Big Data: Recommendations From The Learning From Analysis Of Multicenter Big Data Aggregation (LAMBDA) Consortium. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2020.07.224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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McSweeney SM, Christou EAA, Dand N, Boalch A, Holmes S, Harries M, Palamaras I, Cunningham F, Parkins G, Kaur M, Farrant P, McDonagh A, Messenger A, Jones J, Jolliffe V, Ali I, Ardern-Jones M, Mitchell C, Burrows N, Atkar R, Banfield C, Alexandroff A, Champagne C, Cooper HL, Patel GK, Macbeth A, Page M, Bryden A, Mowbray M, Wahie S, Armstrong K, Cooke N, Goodfield M, Man I, de Berker D, Dunnil G, Takwale A, Rao A, Siah TW, Sinclair R, Wade MS, Bhargava K, Fenton DA, McGrath JA, Tziotzios C. Frontal fibrosing alopecia: a descriptive cross-sectional study of 711 cases in female patients from the UK. Br J Dermatol 2020; 183:1136-1138. [PMID: 32652611 DOI: 10.1111/bjd.19399] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Lee CH, Shah A, Hsieh J, Rao A, Pinto A, Bilen M, Cohn A, Di Simone C, Shaffer D, Girones Sarrio R, Gunnestad Ribe S, Wu J, Schmidt E, Kubiak P, Okpara C, Smith A, Motzer R. 710P Phase II trial of lenvatinib (LEN) + pembrolizumab (PEMBRO) for progressive disease after PD-1/PD-L1 immune checkpoint inhibitor (ICI) in metastatic clear cell (mcc) renal cell carcinoma (RCC): Results by independent imaging review and subgroup analyses. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.08.782] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
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Lam J, Bridgewater J, Alani M, Mullamitha S, Braun M, Kunene V, Baijal S, Holden C, Aboud K, Chopra N, Escola CL, Rao A, Samuel L, Denton A, Grumett S, Melcher L, Muthuramalingam S, Sankey P, Saunders M, Shiu KK. 502P Nivolumab, alone or with ipilimumab, for mismatch repair deficient metastatic colorectal cancer: A United Kingdom multicentre analysis of patient outcomes. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.08.612] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Rao A, McBride EL, Zhang G, Xu H, Cai T, Notkins AL, Aronova MA, Leapman RD. Determination of secretory granule maturation times in pancreatic islet β-cells by serial block-face electron microscopy. J Struct Biol 2020; 212:107584. [PMID: 32736074 DOI: 10.1016/j.jsb.2020.107584] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 07/19/2020] [Accepted: 07/21/2020] [Indexed: 01/19/2023]
Abstract
It is shown how serial block-face electron microscopy (SBEM) of insulin-secreting β-cells in wild-type mouse pancreatic islets of Langerhans can be used to determine maturation times of secretory granules. Although SBEM captures the β-cell structure at a snapshot in time, the observed ultrastructure can be considered representative of a dynamic equilibrium state of the cells since the pancreatic islets are maintained in culture in approximate homeostasis. It was found that 7.2 ± 1.2% (±st. dev.) of the β-cell volume is composed of secretory granule dense-cores exhibiting angular shapes surrounded by wide (typically ≳100 nm) electron-lucent halos. These organelles are identified as mature granules that store insulin for regulated release through the plasma membrane, with a release time of 96 ± 12 h, as previously obtained from pulsed 35S-radiolabeling of cysteine and methionine. Analysis of β-cell 3D volumes reveals a subpopulation of secretory organelles without electron-lucent halos, identified as immature secretory granules. Another subpopulation of secretory granules is found with thin (typically ≲30 nm) electron-lucent halos, which are attributed to immature granules that are transforming from proinsulin to insulin by action of prohormone convertases. From the volume ratio of proinsulin in the immature granules to insulin in the mature granules, we estimate that the newly formed immature granules remain in morphologically-defined immature states for an average time of 135 ± 14 min, and the immature transforming granules for an average time of 130 ± 17 min.
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Markey KA, Schluter J, Gomes ALC, Littmann ER, Pickard AJ, Taylor BP, Giardina PA, Weber D, Dai A, Docampo MD, Armijo GK, Slingerland AE, Slingerland JB, Nichols KB, Brereton DG, Clurman AG, Ramos RJ, Rao A, Bush A, Bohannon L, Covington M, Lew MV, Rizzieri DA, Chao N, Maloy M, Cho C, Politikos I, Giralt S, Taur Y, Pamer EG, Holler E, Perales MA, Ponce DM, Devlin SM, Xavier J, Sung AD, Peled JU, Cross JR, van den Brink MRM. The microbe-derived short-chain fatty acids butyrate and propionate are associated with protection from chronic GVHD. Blood 2020; 136:130-136. [PMID: 32430495 PMCID: PMC7332893 DOI: 10.1182/blood.2019003369] [Citation(s) in RCA: 82] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Accepted: 04/19/2020] [Indexed: 01/10/2023] Open
Abstract
Studies of the relationship between the gastrointestinal microbiota and outcomes in allogeneic hematopoietic stem cell transplantation (allo-HCT) have thus far largely focused on early complications, predominantly infection and acute graft-versus-host disease (GVHD). We examined the potential relationship of the microbiome with chronic GVHD (cGVHD) by analyzing stool and plasma samples collected late after allo-HCT using a case-control study design. We found lower circulating concentrations of the microbe-derived short-chain fatty acids (SCFAs) propionate and butyrate in day 100 plasma samples from patients who developed cGVHD, compared with those who remained free of this complication, in the initial case-control cohort of transplant patients and in a further cross-sectional cohort from an independent transplant center. An additional cross-sectional patient cohort from a third transplant center was analyzed; however, serum (rather than plasma) was available, and the differences in SCFAs observed in the plasma samples were not recapitulated. In sum, our findings from the primary case-control cohort and 1 of 2 cross-sectional cohorts explored suggest that the gastrointestinal microbiome may exert immunomodulatory effects in allo-HCT patients at least in part due to control of systemic concentrations of microbe-derived SCFAs.
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Koyyala V, Jajodia A, Gupta A, BP A, Chaturvedhi A, Rao A, Mehta A, Gupta N, Pasricha S, Joga S, Medisetty P, Mantia ML, Goyal S, Singh S. P-309 Correlation between baseline CEA levels and TNM stage at presentation in colorectal cancers in an Indian population. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.04.391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Gill J, Ramesh V, Leef S, Rao A, Mathews T, Zhao Z, Morrison S. 123 Identification of GAPDHS as a novel regulator of melanoma metastasis and metabolic plasticity. J Invest Dermatol 2020. [DOI: 10.1016/j.jid.2020.03.126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Koyyala V, Jajodia A, Gupta A, Chaturvedhi A, Rao A, Goyal S, Mehta A, Prosch H, Pasricha S, Choudhary A, La Mantia M, BP A, Gupta N, Singh S. P-189 Role of radiomics in clinical prognostication and prediction of survival among a cohort of metastatic intrahepatic cholangiocarcinoma. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.04.271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Wagner C, Amamcharla JK, Rao A, Metzger LE. Adapting blood glucose meter biosensors for the measurement of lactose in dairy ingredients. J Dairy Sci 2020; 103:7585-7597. [PMID: 32505394 DOI: 10.3168/jds.2019-17903] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Accepted: 03/28/2020] [Indexed: 11/19/2022]
Abstract
Commonly used lactose assays [enzymatic spectrophotometric absorbance (EZA) and HPLC] for dairy ingredients are relatively expensive and time consuming. A blood glucose meter (BGM)-based method has successfully been documented as a rapid lactose assay in milk. However, the BGM-based method has not been evaluated in dairy ingredients. The objective of this study was to evaluate the BGM-based lactose analysis method in whey-derived (WD) and skim milk-derived (SMD) ingredients. The study was carried out in 4 phases. In phase 1, the effect of pH and lactose concentrations on the BGM reading was investigated using a factorial design with 2 factors: pH (6.02-7.50) and lactose (0.2 or 0.4%). We found that BGM readings were significantly affected by lower pH values at both lactose levels. In phase 2, the effect of total solids and ingredient type was investigated using a factorial design with 2 factors: ingredient type (WD or SMD) and total solids (0-8%). It was observed that the BGM reading was significantly affected by ingredient type and total solids. Phase 3 involved developing a linear relationship between the BGM reading and the EZA reference method to ascertain the accuracy of the proposed BGM method. Different ingredient types (WD or SMD) and non-lactose solids (0.5-27%) model ingredient dilutions prepared over a range of lactose contents (0.08-0.62%) were measured using the BGM and EZA methods. The average absolute percentage bias difference between the BGM method and EZA reference method results for these model dilutions was found to be between 2.2 and 7.3%. In phase 4, 15 samples procured from commercial sources ranging from 0.01 to 81.9% lactose were evaluated using the BGM method and EZA reference method. The average absolute percentage bias difference for lactose results between the 2 methods ranged from 3.6 to 5.0% and 5.3 to 9.7% for well-performing and poorly performing meters, respectively. Overall, the BGM method is a promising tool for rapid and low-cost analysis of lactose in both high-lactose and low-lactose dairy ingredients.
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Chatterjee S, Bhattacharjee D, Misra S, Rao A, Chattopadhyay A, Ghosh A. AB0006 HYPOMETHYLATION OF THE PROMOTER REGION OF TLR4 GENE AT A SYSTEMIC LEVEL IN PATIENTS WITH RHEUMATOID ARTHRITIS AND PERIODONTITIS. Ann Rheum Dis 2020. [DOI: 10.1136/annrheumdis-2020-eular.3455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Background:Periodontitis (PD) has long been linked with Rheumatoid arthritis (RA) [1]. Epigenetic modifications are being recently explored to explain such associations, DNA methylation being one such important mechanism.Objectives:To study the effect chronic generalized periodontitis on systemic methylation of TLR4 genes in comparison to only RA and RA with PD patients.Methods:Twenty-three RA patients, among which 11 patients had chronic generalized PD, 20 patients with only PD and 15 healthy individuals recruited. DNA was isolated from PBMCs of the participants blood, then were first bisulphite converted and then methylation specific PCR were performed using primers for methylated and um-methylated promoters of TLR4. The DNA amplifications were checked in horizontal gel electrophoresis. The methylation signatures were verified by DNA sequencing (Sanger) of the amplified products.Results:The anti-CCP, DAS-CRP and HAQ DI were higher in patients with both RA and PD (220±40, 5.7±0.2, 1.5±0.1 respectively, p<0.05). Control samples had shown amplification bands for methylated primers of TLR4 but not for un-methylated primers of TLR4. However, only RA, only PD and RA with PD samples, had shown amplification for un-methylated primers and not for methylated primers. These results together with DNA sequencing indicated that 4 CpG sites in the promoter ofTLR4 genes were hypo-methylated in the PBMCs of patients whereas those remain methylated in healthy individuals.Conclusion:The observations indicated that though PD is a localised disease of the gingiva there is a systemic involvement of TLR mediated pathways in them which is similar to those in RA. However, further validation in larger cohort and down-stream signalling molecules needs to be studied.References:[1]Ceccarelli F, Saccucci M, Di Carlo G, Lucchetti R, Pilloni A, Pranno N, Luzzi V, Valesini G, Polimeni A. Periodontitis and rheumatoid arthritis: the same inflammatory mediators?. Mediators of inflammation. 2019;2019.Disclosure of Interests:None declared
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Parashar A, Jajodia A, Chaturvedi A, Rao A, Mehta A, Doval D, Bp A, Medisetty P, Koyyala V, Pasricha S, la Mantia M, Chllamma M, Leithner D, Mayerhoefer M, Russo A, Prosch H. 72P Non-mass like enhancement patterns on MR mammography and their pathological correlation. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.03.206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Kaur T, Dahiya S, Satija SH, Nawal SJ, Kshetrimayum N, Ningthoujam J, Chahal AK, Rao A. Foldscope as a primary diagnostic tool for oral and urinary tract infections and its effectiveness in oral health education. J Microsc 2020; 279:39-51. [PMID: 32286690 DOI: 10.1111/jmi.12896] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2020] [Revised: 03/28/2020] [Accepted: 04/08/2020] [Indexed: 11/28/2022]
Abstract
Due to its speed, accuracy and cost-effectiveness, microscopy has become an integral part of clinical examination for disease diagnosis. However, modern microscopes are very costly and require skilled personnel for their operation and maintenance, and specimen processing and analysis is labour-intensive. Further, lack of such expensive diagnostic tools in remote areas is a serious concern. Affordable point-of-care diagnostic tools are the most useful for timely disease diagnosis and management. The Foldscope is an affordable origami-based microscopy device composed of a series of paper clippings, which, upon assembly, can hold a specimen slide for observation, and this specimen can be viewed via a mobile phone camera attached to it. The present study evaluated the use of the Foldscope in the clinical diagnosis of oral and urinary tract infections and evaluated its efficacy as a motivational tool for improving oral health among school children in India. We qualitatively compared the Foldscope to a clinical microscope by examining five different types of clinical samples. Of the different types of clinical samples, the Foldscope was effective in detecting infection in dental plaque samples and urine samples. Thus, we further analysed 31 dental plaque samples of patients aged 3-13 years and 25 urine samples of patients aged 11-62 years. We also evaluated the use of the Foldscope as an educational tool for motivating oral hygiene among 80 school children aged 12 years and found that students in the Foldscope intervention group had better measures of oral hygiene than did students in the nonintervention group. In summary, our study indicated that the Foldscope is useful in detecting urinary tract infections and kidney stones in urine samples and is a useful motivational tool for oral health education among school-aged children. Furthermore, it may also be useful in oral health monitoring in resource poor settings. LAY DESCRIPTION: Poor and remote population often suffers due to lack of capacity to buy products or avail services which are expensive. In such a society people are not able to afford even the basic detection of diseases. Foldscope may come to rescue here! Foldscope is a paper-based, use-and-throw, affordable microscope. This study explores the use of Foldscope in clinics and diseases diagnosis using patient samples. Preliminary detection of disease associated symptoms in dental and urinary infections and digital record keeping via storage in mobile phone memory and hospital OPD records for monitoring patient's health are some of the advantages of Foldscope for clinical use in resource poor settings. It identifies that Foldscope not only can be used by students or teachers for educational purposes but it can also pave a path for promotion of dental hygiene among young children. The study also suggests that further improvement in design or resolution of Foldscope will broaden the scope of its application, in future.
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Jajodia A, Gupta A, Mehta A, Chaturvedi A, Rao A, Gupta G, Doval D, Bp A, Medisetty P, Bommera S, Koyyala V, Pasricha S, Mayerhoefer M, Prosch H, Chllamma M, la Mantia M, Russo A. 71P Role of radiomics in predicting molecular phenotypes of female breast cancer. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.03.205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Oliveros E, Suboc T, Marinescu K, Rao A, Aggarwal N, Volgman-Santos A. National Inpatient Sample Database Reveals Pulmonary Artery Catheter Use Decreases Outcomes but Underused in Women. J Heart Lung Transplant 2020. [DOI: 10.1016/j.healun.2020.01.1092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Stewart D, Rao A, Groninger H. Quality of Life Outcomes of Patients Receiving Palliative, Long-Term Continuous Intravenous Inotropic Support. J Heart Lung Transplant 2020. [DOI: 10.1016/j.healun.2020.01.905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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Rao A, Zecchin R, Denniss A, Hickman L, DiGiacomo M, Phillips J, Newton P. 018 Do Social, Lifestyle and Cardiovascular Risk Factors Predict Dropout from Cardiac Rehabilitation Programs? A Longitudinal Cohort Study. Heart Lung Circ 2020. [DOI: 10.1016/j.hlc.2020.09.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Rao A, Hales S, Bhat A, Chen H, MacIntyre R, Tan T, Gan G. 470 COVID-19 Experience in New South Wales (NSW) - A Case Series. Heart Lung Circ 2020. [PMCID: PMC7648880 DOI: 10.1016/j.hlc.2020.09.477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Rao A, Hales S, Roach K, Bhat A, Chen H, Tanous D, Gan G. 654 Coronary Arteriovenous Fistulae in Setting of Giant Coronary Artery in a Patient with Sarcoidosis-Lymphoma Syndrome. Heart Lung Circ 2020. [DOI: 10.1016/j.hlc.2020.09.661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Vien A, Yardi S, Bhat A, Chen H, Chandrakumar D, Rao A, Latumahina A, Goode E, Tan T, Sindone A, Gan G. 075 Anaemia is a Driver of Heart Failure Rehospitalisation in Patients With Atrial Fibrillation and Heart Failure With Reduced Ejection Fraction. Heart Lung Circ 2020. [DOI: 10.1016/j.hlc.2020.09.082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Hui J, O'Dell ZJ, Rao A, Riley KR. In Situ Quantification of Silver Nanoparticle Dissolution Kinetics in Simulated Sweat Using Linear Sweep Stripping Voltammetry. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:13117-13125. [PMID: 31644870 DOI: 10.1021/acs.est.9b04151] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Linear sweep stripping voltammetry (LSSV) is demonstrated as a sensitive, rapid, and cost-efficient analytical technique for the quantification of silver nanoparticle (AgNP) dissolution rates in simulated sweat. LSSV does not require the extensive sample preparation (e.g., ultrafiltration or centrifugation) needed by more commonly employed techniques, such as atomic spectroscopy. The limit of detection (LOD) of Ag(I)(aq) was 14 ± 6 μg L-1, and measured dissolution rate constants, kdissolution, varied from 0.0168-0.1524 h-1, depending on solution conditions. These values are comparable and agree well with those determined by others in the literature using atomic spectroscopy. Importantly, LSSV had the necessary sensitivity to distinguish the effects of SSW solution conditions on AgNP dissolution rates. Specifically, enhanced dissolution rates were observed with decreased pH and with increased NaCl concentration. The colloidal stability of AgNPs in SSW solutions was also characterized using dynamic light scattering (DLS), ζ potential, and quantitative UV-vis spectroscopy measurements. An increase in AgNP aggregation rate was observed with increased NaCl concentration in SSW, suggesting that the enhancement in AgNP dissolution is driven by the large Cl/Ag ratio, even as the AgNPs undergo significant aggregation.
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