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Taghavi M, Russello H, Ouweltjes W, Kamphuis C, Adriaens I. Cow key point detection in indoor housing conditions with a deep learning model. J Dairy Sci 2024; 107:2374-2389. [PMID: 37863288 DOI: 10.3168/jds.2023-23680] [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: 05/01/2023] [Accepted: 10/02/2023] [Indexed: 10/22/2023]
Abstract
Lameness in dairy cattle is a costly and highly prevalent problem that affects all aspects of sustainable dairy production, including animal welfare. Automation of gait assessment would allow monitoring of locomotion in which the cows' walking patterns can be evaluated frequently and with limited labor. With the right interpretation algorithms, this could result in more timely detection of locomotion problems. This in turn would facilitate timely intervention and early treatment, which is crucial to reduce the effect of abnormal behavior and pain on animal welfare. Gait features of dairy cows can potentially be derived from key points that locate crucial anatomical points on a cow's body. The aim of this study is 2-fold: (1) to demonstrate automation of the detection of dairy cows' key points in a practical indoor setting with natural occlusions from gates and races, and (2) to propose the necessary steps to postprocess these key points to make them suitable for subsequent gait feature calculations. Both the automated detection of key points as well as the postprocessing of them are crucial prerequisites for camera-based automated locomotion monitoring in a real farm environment. Side-view video footage of 34 Holstein-Friesian dairy cows, captured when exiting the milking parlor, were used for model development. From these videos, 758 samples of 2 successive frames were extracted. A previously developed deep learning model called T-LEAP was trained to detect 17 key points on cows in our indoor farm environment with natural occlusions. To this end, the dataset of 758 samples was randomly split into a train (n = 22 cows; no. of samples = 388), validation (n = 7 cows; no. of samples = 108), and test dataset (n = 15 cows; no. of samples = 262). The performance of T-LEAP to automatically assign key points in our indoor situation was assessed using the average percentage of correctly detected key points using a threshold of 0.2 of the head length (PCKh0.2). The model's performance on the test set achieved a good result with PCKh0.2: 89% on all 17 key points together. Detecting key points on the back (n = 3 key points) of the cow had the poorest performance PCKh0.2: 59%. In addition to the indoor performance of the model, a more detailed study of the detection performance was conducted to formulate postprocessing steps necessary to use these key points for gait feature calculations and subsequent automated locomotion monitoring. This detailed study included the evaluation of the detection performance in multiple directions. This study revealed that the performance of the key points on a cows' back were the poorest in the horizontal direction. Based on this more in-depth study, we recommend the implementation of the outlined postprocessing techniques to address the following issues: (1) correcting camera distortion, (2) rectifying erroneous key point detection, and (3) establishing the necessary procedures for translating hoof key points into gait features.
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Affiliation(s)
- M Taghavi
- Wageningen Livestock Research, Wageningen University and Research, 6708 WD Wageningen, the Netherlands.
| | - H Russello
- Agricultural Biosystems Engineering, Wageningen University and Research, 6700 AA Wageningen, the Netherlands
| | - W Ouweltjes
- Wageningen Livestock Research, Wageningen University and Research, 6708 WD Wageningen, the Netherlands
| | - C Kamphuis
- Wageningen Livestock Research, Wageningen University and Research, 6708 WD Wageningen, the Netherlands
| | - I Adriaens
- Wageningen Livestock Research, Wageningen University and Research, 6708 WD Wageningen, the Netherlands; Department of Biosystems Engineering, Livestock Technology, KU Leuven, 3001 Leuven, Belgium; Department of Mathematical Modelling and Data Analysis, BioVisM, Ghent University, B-9000 Ghent, Belgium
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Jacobs L, Wauters N, Lablad Y, Morelle J, Taghavi M. Diagnosis and Management of Catastrophic Antiphospholipid Syndrome and the Potential Impact of the 2023 ACR/EULAR Antiphospholipid Syndrome Classification Criteria. Antibodies (Basel) 2024; 13:21. [PMID: 38534211 DOI: 10.3390/antib13010021] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 03/05/2024] [Accepted: 03/06/2024] [Indexed: 03/28/2024] Open
Abstract
Catastrophic antiphospholipid syndrome (CAPS) is a rare and life-threatening condition characterized by the persistence of antiphospholipid antibodies and occurrence of multiple vascular occlusive events. CAPS currently remains a diagnostic challenge and requires urgent treatment. The diagnosis of CAPS is made difficult by classification criteria used as diagnostic criteria in clinical practice, knowledge derived from retrospective data and case reports, confounding clinical and biological features, and its rapid onset and mortality. The absence of prospective studies of CAPS limits the strength of evidence for guideline treatment protocols. This comprehensive review summarizes the current understanding of the disease, and discusses how the 2023 ACR/EULAR Antiphospholipid Syndrome Classification Criteria impact the definition and therapeutic management of CAPS, which is considered the most severe form of APS. The correct integration of 2023 ACR/EULAR APS classification criteria is poised to facilitate CAPS diagnosis, particularly in critical situations, offering a promising avenue for improved outcomes.
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Affiliation(s)
- Lucas Jacobs
- Internal Medicine Department, Brugmann University Hospital, Université Libre de Bruxelles, 1020 Brussels, Belgium
- Nephrology and Dialysis Department, Brugmann University Hospital, Université Libre de Bruxelles, 1020 Brussels, Belgium
- Internal Medicine Department, Tivoli University Hospital, Université Libre de Bruxelles, 7100 La Louvière, Belgium
| | - Nader Wauters
- Internal Medicine Department, Tivoli University Hospital, Université Libre de Bruxelles, 7100 La Louvière, Belgium
| | - Yahya Lablad
- Internal Medicine Department, Brugmann University Hospital, Université Libre de Bruxelles, 1020 Brussels, Belgium
| | - Johann Morelle
- Division of Nephrology, Namur University Hospitals (CHU UCL Namur), 5000 Namur, Belgium
| | - Maxime Taghavi
- Internal Medicine Department, Brugmann University Hospital, Université Libre de Bruxelles, 1020 Brussels, Belgium
- Nephrology and Dialysis Department, Brugmann University Hospital, Université Libre de Bruxelles, 1020 Brussels, Belgium
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Barbhaiya M, Taghavi M, Zuily S, Domingues V, Chock EY, Tektonidou MG, Erkan D, Seshan SV. Efforts to Better Characterize "Antiphospholipid Antibody Nephropathy" for the 2023 ACR/EULAR Antiphospholipid Syndrome Classification Criteria: Renal Pathology Subcommittee Report. J Rheumatol 2024; 51:150-159. [PMID: 37399462 DOI: 10.3899/jrheum.2022-1200] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [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] [Accepted: 06/02/2023] [Indexed: 07/05/2023]
Abstract
OBJECTIVE Antiphospholipid antibody (aPL) nephropathy (-N) can be challenging to recognize due to a lack of established classification or diagnostic criteria. As part of efforts to develop new antiphospholipid syndrome (APS) classification criteria (CC), the APS CC Renal Pathology Subcommittee aimed to better characterize the entity of aPL-N. METHODS We used a 4-pronged approach that included (1) administering Delphi surveys to worldwide APS physicians to generate aPL-N terminology; (2) conducting a literature review to demonstrate the association of nephropathy with aPL and identify published aPL-N histopathological terminology and descriptions; (3) evaluating aPL-N terminology used in renal biopsy reports from an international patient registry; and (4) evaluating proposed kidney pathologic features for aPL-N by assessment of international Renal Pathology Society (RPS) members. RESULTS After completing our metaanalysis demonstrating an association between nephropathy and aPL, we used Delphi surveys, a literature review, and international renal biopsy reports to develop a preliminary definition of aPL-N. The preliminary definition included include specific terms associated with acute (ie, thrombotic microangiopathy in glomeruli or arterioles/arteries) and chronic (ie, organized arterial or arteriolar microthrombi with or without recanalization, organized glomerular thrombi, fibrous and fibrocellular [arterial or arteriolar] occlusions, focal cortical atrophy with or without thyroidization, and fibrous intimal hyperplasia) lesions. Most RPS survey respondents agreed with this terminology and the importance of knowing aPL results for histopathological diagnosis. CONCLUSION Our results support the inclusion of aPL-N in the 2023 American College of Rheumatology/European Alliance of Associations for Rheumatology APS CC, and provide the most widely accepted terminology to date for both acute and chronic pathologic lesions of aPL-N.
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Affiliation(s)
- Medha Barbhaiya
- M. Barbhaiya, MD, MPH, D. Erkan, MD, MPH, Hospital for Special Surgery, and Weill Cornell Medicine, New York, New York, USA;
| | - Maxime Taghavi
- M. Taghavi, MD, Department of Nephrology, Centre Hospitalier Universitaire Brugmann, Université Libre de Bruxelles, Belgium
| | - Stephane Zuily
- S. Zuily, MD, PhD, Université de Lorraine, Inserm, Défaillance Cardiovasculaire Aiguë et Chronique, and Centre Hospitalier Régional Universitaire de Nancy, Vascular Medicine Division, and French National Referral Center for Rare Autoimmune Diseases, Nancy, France
| | | | - Eugenia Y Chock
- E.Y. Chock, MD, MPH, Section of Rheumatology, Yale School of Medicine, New Haven, Connecticut, USA
| | - Maria G Tektonidou
- M.G. Tektonidou, First Department of Internal Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | - Doruk Erkan
- M. Barbhaiya, MD, MPH, D. Erkan, MD, MPH, Hospital for Special Surgery, and Weill Cornell Medicine, New York, New York, USA
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Taghavi M, Jabrane A, Jacobs L, Mesquita MDCF, Demulder A, Nortier J. Antiphospholipid Antibodies Associated with Native Arteriovenous Fistula Complications in Hemodialysis Patients: A Comprehensive Review of the Literature. Antibodies (Basel) 2024; 13:1. [PMID: 38247565 PMCID: PMC10801604 DOI: 10.3390/antib13010001] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 12/18/2023] [Accepted: 12/20/2023] [Indexed: 01/23/2024] Open
Abstract
Antiphospholipid antibody (aPL)-persistent positivity is frequent in hemodialysis (HD) patients. Native arteriovenous fistula (AVF) complications such as stenosis and thrombosis are among the most important causes of morbidity and mortality in hemodialysis patients. The association between aPL positivity and AVF thrombosis seems to now be well established. However, whether aPL positivity is associated with other AVF complications, such as maturation failure or stenosis, is not well known. Given the significant impact of AVF failure on patient's prognosis, it is of interest to further investigate this particular point in order to improve prevention, surveillance and treatment, and, ultimately, the patient's outcome. This literature review aims to report the recent literature on aPL-associated native AVF complications.
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Affiliation(s)
- Maxime Taghavi
- Nephrology and Dialysis Department, Brugmann University Hospital, Université Libre de Bruxelles (ULB), 1020 Brussels, Belgium; (A.J.); (L.J.); (M.D.C.F.M.); (J.N.)
- Laboratory of Experimental Nephrology, Faculty of Medicine, Université Libre de Bruxelles (ULB), 1070 Brussels, Belgium
| | - Abla Jabrane
- Nephrology and Dialysis Department, Brugmann University Hospital, Université Libre de Bruxelles (ULB), 1020 Brussels, Belgium; (A.J.); (L.J.); (M.D.C.F.M.); (J.N.)
| | - Lucas Jacobs
- Nephrology and Dialysis Department, Brugmann University Hospital, Université Libre de Bruxelles (ULB), 1020 Brussels, Belgium; (A.J.); (L.J.); (M.D.C.F.M.); (J.N.)
| | - Maria Do Carmo Filomena Mesquita
- Nephrology and Dialysis Department, Brugmann University Hospital, Université Libre de Bruxelles (ULB), 1020 Brussels, Belgium; (A.J.); (L.J.); (M.D.C.F.M.); (J.N.)
| | - Anne Demulder
- Laboratory of Hematology and Haemostasis LHUB-ULB, Brugmann University Hospital, Université Libre de Bruxelles (ULB), 1020 Brussels, Belgium;
| | - Joëlle Nortier
- Nephrology and Dialysis Department, Brugmann University Hospital, Université Libre de Bruxelles (ULB), 1020 Brussels, Belgium; (A.J.); (L.J.); (M.D.C.F.M.); (J.N.)
- Laboratory of Experimental Nephrology, Faculty of Medicine, Université Libre de Bruxelles (ULB), 1070 Brussels, Belgium
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Sam A, Boostani R, Hashempour S, Taghavi M, Sanei S. Depression Identification Using EEG Signals via a Hybrid of LSTM and Spiking Neural Networks. IEEE Trans Neural Syst Rehabil Eng 2023; 31:4725-4737. [PMID: 37995160 DOI: 10.1109/tnsre.2023.3336467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2023]
Abstract
Depression severity can be classified into distinct phases based on the Beck depression inventory (BDI) test scores, a subjective questionnaire. However, quantitative assessment of depression may be attained through the examination and categorization of electroencephalography (EEG) signals. Spiking neural networks (SNNs), as the third generation of neural networks, incorporate biologically realistic algorithms, making them ideal for mimicking internal brain activities while processing EEG signals. This study introduces a novel framework that for the first time, combines an SNN architecture and a long short-term memory (LSTM) structure to model the brain's underlying structures during different stages of depression and effectively classify individual depression levels using raw EEG signals. By employing a brain-inspired SNN model, our research provides fresh perspectives and advances knowledge of the neurological mechanisms underlying different levels of depression. The methodology employed in this study includes the utilization of the synaptic time dependent plasticity (STDP) learning rule within a 3-dimensional brain-template structured SNN model. Furthermore, it encompasses the tasks of classifying and predicting individual outcomes, visually representing the structural alterations in the brain linked to the anticipated outcomes, and offering interpretations of the findings. Notably, our method achieves exceptional accuracy in classification, with average rates of 98% and 96% for eyes-closed and eyes-open states, respectively. These results significantly outperform state-of-the-art deep learning methods.
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Dogahe D, Taghavi M, Cubilier E, Sanoussi S, Duttman R, Nortier J, do Carmo Filomena Mesquita M. Multiple Complications of Crohn's Disease and the Need for Early and Continuous Multidisciplinary Undertaking. J Med Cases 2023; 14:356-361. [PMID: 38029055 PMCID: PMC10681768 DOI: 10.14740/jmc4154] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Accepted: 10/13/2023] [Indexed: 12/01/2023] Open
Abstract
Crohn's disease is an inflammatory disease that typically affects the bowels but can also have many different extraintestinal manifestations. One of those complications is immunoglobulin A nephropathy (IgAN), which is one of the most encountered renal lesions in the setting of Crohn's disease. Another point of focus for Crohn's patients is the risk of cancer, with a higher risk of colorectal cancer but also extraintestinal neoplasia such as hepatobiliary, hematological, and urinary tract neoplasia. We present the case of a young patient suffering from long-term Crohn's disease and subsequent IgAN leading to end-stage kidney disease and hemodialysis. The patient was diagnosed young and had undergone multiple surgeries and different treatments in various countries. He then presented in our center already with advanced chronic renal failure from IgAN that was unknown due to poor multidisciplinary follow-up. Shortly after starting hemodialysis, he developed a large abdominal mass, first thought to result from Crohn's-related fistula. This mass turned out to be a urachal adenocarcinoma, a rare type of bladder cancer with an especially poor prognosis. It is not known whether this type of cancer is associated with either Crohn's disease or IgAN, and no such association has been previously described. The treatment of urachal cancer usually relies on surgery, with the addition of chemotherapy in some cases. Unfortunately for our patient, his case was already so advanced at the moment of diagnosis that he was excluded from curative treatment and quickly passed away thereafter. This case illustrates many important aspects of the rigorous follow-up that is needed for Crohn's patients, with regular check-ups, screening investigations, and the need for multidisciplinary evaluation. Furthermore, it describes the development of a rare type of cancer in the setting of Crohn's disease and IgAN, with no prior established link between these different pathologies.
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Affiliation(s)
- David Dogahe
- Nephrology and Dialysis Department, Brugmann University Hospital, Universite Libre de Bruxelles (ULB), Brussels, Belgium
- These authors contributed equally to this article
| | - Maxime Taghavi
- Nephrology and Dialysis Department, Brugmann University Hospital, Universite Libre de Bruxelles (ULB), Brussels, Belgium
- These authors contributed equally to this article
| | - Edouard Cubilier
- Nephrology and Dialysis Department, Brugmann University Hospital, Universite Libre de Bruxelles (ULB), Brussels, Belgium
| | - Said Sanoussi
- Radiology Department, Brugmann University Hospital, Universite Libre de Bruxelles (ULB), Brussels, Belgium
| | - Ruth Duttman
- Pathology Department, Brugmann University Hospital, Universite Libre de Bruxelles (ULB), Brussels, Belgium
| | - Joelle Nortier
- Nephrology and Dialysis Department, Brugmann University Hospital, Universite Libre de Bruxelles (ULB), Brussels, Belgium
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Kamgang Semeu P, Taghavi M, Geers C, Mouthon L, Barreto Gutierrez L, Stordeur P. Scleroderma renal crisis triggered by ibuprofen: Insights on complement-directed therapy. J Scleroderma Relat Disord 2023; 8:NP6-NP8. [PMID: 37744046 PMCID: PMC10515997 DOI: 10.1177/23971983231163663] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Accepted: 02/25/2023] [Indexed: 09/26/2023]
Abstract
Scleroderma renal crisis is a severe complication of systemic sclerosis with a poor prognosis. Therefore, identifying precipitating factors is essential. Among known risk factors, only few are reversible. On the contrary, anti-C5 therapy appears effective, at least in some cases. We describe a 59-year-old man with diffuse cutaneous systemic sclerosis who developed life-threatening scleroderma renal crisis following ibuprofen administration. Despite aggressive management, he did not improve. Renal biopsy have displayed features of thrombotic microangiopathy but no complement deposition. We then discuss the pathomechanism of scleroderma renal crisis that could drive eculizumab treatment since some renal biopsies exhibit complement deposits and others do not.
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Affiliation(s)
- Prochore Kamgang Semeu
- Division of Nephrology, Department of Internal Medicine, ULB-VUB Center for Hereditary Metabolic Diseases, Brugmann University Hospital, Université Libre de Bruxelles, Brussels, Belgium
| | - Maxime Taghavi
- Division of Nephrology, Department of Internal Medicine, Brugmann University Hospital, Université Libre de Bruxelles, Brussels, Belgium
| | - Caroline Geers
- Department of Pathology, Brugmann University Hospital and UZ Brussel, Vrije Universiteit Brussel, Brussels, Belgium
| | - Luc Mouthon
- Department of Internal Medicine and Reference Center for Vasculitis and Systemic Sclerosis, Cochin Hospital, Assistance Publique-Hôpitaux de Paris (AP-HP), Faculty of Medicine, Paris-Descartes University, Paris, France
| | - Leonel Barreto Gutierrez
- Department of Intensive Care, Brugmann University Hospital, Université Libre de Bruxelles, Brussels, Belgium
| | - Patrick Stordeur
- National Reference Center for the Complement System, Laboratory of Immunology, LHUB-ULB, Université Libre de Bruxelles, Brussels, Belgium
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Dogahe D, Cubilier E, Taghavi M, Kaysi S, Nortier J, Mesquita MDCF. Evaluation of Transplant Suitability in a Patient with Previous Colorectal Cancer and Subsequent Radiation Cystitis: Insights from a Complicated Case. Case Rep Nephrol 2023; 2023:7839441. [PMID: 37790841 PMCID: PMC10545455 DOI: 10.1155/2023/7839441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 08/07/2023] [Accepted: 08/25/2023] [Indexed: 10/05/2023] Open
Abstract
Assessing transplant suitability can be a meticulous process, involving multiple investigations and various specialties. This process is well described in the latest KDIGO guidelines. We recently asked ourselves if those guidelines are still relevant to current clinical practice given the rapid evolution of modern medicine, especially in the field of oncology. We present the complicated case of a 60-year-old woman with ESKD (end-stage kidney disease) and a prior history of cancer, with secondary urological complications, to illustrate different interesting considerations for KT (kidney transplant). Our patient was diagnosed with rectal cancer at the age of 46, for which she was treated with surgery and radiotherapy before developing chronic radiation cystitis. This was followed by repeated urinary tract infections and secondary nephrolithiasis, ultimately leading to severe bilateral hydronephrosis and obstructive ESKD. We know that the type of cancer and its characteristics should be evaluated in detail, and we should offer patient-tailored recommendations after a multidisciplinary evaluation. In our case, the prior rectal cancer is not to be feared because curative treatment has been achieved and the patient has been cancer-free for 14 years, knowing that this type of cancer is not at high risk of recurrence after transplantation. The frail urological anatomy, however, represents a bigger challenge. Not only does it complicate the technical feasibility of KT but it also increases the risk of complications and graft failure. It is difficult to clearly determine KT possibility when considering it in such patients. What is clear on the other hand is that such a decision should be taken considering the choice of the patient and the involved physicians. We should also consider the potential benefits and risks of KT in order to make an informed decision.
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Affiliation(s)
- David Dogahe
- Nephrology and Dialysis Department, Brugmann University Hospital, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Edouard Cubilier
- Nephrology and Dialysis Department, Brugmann University Hospital, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Maxime Taghavi
- Nephrology and Dialysis Department, Brugmann University Hospital, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Saleh Kaysi
- Nephrology and Dialysis Department, Brugmann University Hospital, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Joëlle Nortier
- Nephrology and Dialysis Department, Brugmann University Hospital, Université Libre de Bruxelles (ULB), Brussels, Belgium
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Imeri I, Cubilier E, Taghavi M, Kaysi S, Nortier J, Mesquita MDCF. Native Mitral Valve Endocarditis Caused by a Non-HACEK Gram-Negative Pathogen in a Hemodialysis Patient. J Med Cases 2023; 14:174-178. [PMID: 37303968 PMCID: PMC10251704 DOI: 10.14740/jmc4089] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 05/18/2023] [Indexed: 06/13/2023] Open
Abstract
Infective endocarditis (IE) due to non-HACEK (species other than Hemophilus, Aggregatibacter, Cardiobacterium, Eikenella, Kingella) bacteremia accounts for less than 2% of all IE cases but is proven to be associated with higher mortality, even more so in hemodialysis (HD) patients. Few data are available in the literature concerning non-HACEK Gram-negative (GN) IE in this immunocompromised population with multiple comorbidities. We report the atypical clinical presentation of an elderly HD patient diagnosed with a non-HACEK GN IE, namely E. coli, successfully treated with intravenous (IV) antibiotics. The objective of this case study and related literature was to highlight the limited applicability of the modified Duke criteria in the HD population, as well as the frailty of HD patients that increases their susceptibility to IE due to unexpected microorganisms that could have fatal consequences. The need for a multidisciplinary approach of an IE in HD patients is therefore imperative.
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Affiliation(s)
- Ilire Imeri
- Nephrology and Dialysis Department, Brugmann University Hospital, Universite Libre de Bruxelles (ULB), Brussels, Belgium
| | - Edouard Cubilier
- Nephrology and Dialysis Department, Brugmann University Hospital, Universite Libre de Bruxelles (ULB), Brussels, Belgium
| | - Maxime Taghavi
- Nephrology and Dialysis Department, Brugmann University Hospital, Universite Libre de Bruxelles (ULB), Brussels, Belgium
| | - Saleh Kaysi
- Nephrology and Dialysis Department, Brugmann University Hospital, Universite Libre de Bruxelles (ULB), Brussels, Belgium
| | - Joelle Nortier
- Nephrology and Dialysis Department, Brugmann University Hospital, Universite Libre de Bruxelles (ULB), Brussels, Belgium
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Jacobs L, Salaouatchi M, Taghavi M, Sanoussi S, Nortier J, Mesquita M. Jejunal perforation secondary to blind insertion of peritoneal dialysis catheter: a case report and review of literature. BMC Nephrol 2023; 24:116. [PMID: 37106351 PMCID: PMC10134622 DOI: 10.1186/s12882-023-03155-9] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Accepted: 04/05/2023] [Indexed: 04/29/2023] Open
Abstract
BACKGROUND Peritoneal dialysis (PD) depends upon a functioning and durable access to the peritoneal cavity. Many techniques exist to insert a peritoneal catheter, showing similar outcomes and benefits. Blind percutaneous insertion represents a bedside intervention predominantly performed by nephrologists requiring only local anesthesia, sedation and minimal transcutaneous access. Although current guidelines recommend insertion techniques allowing visualization of the peritoneal cavity, the blind percutaneous approach is still widely used and has been proven safe and effective to bring durable peritoneal dialysis access. Herein, we described a rare case of jejunal perforation secondary to blind PD catheter placement, and conduct a review of the current medical literature describing early bowel perforations secondary to PD catheter placement, gathering descriptions of symptomatology and outcomes and their relations to the insertion technique. CLINICAL PRESENTATION We herein describe the case of a 48 year-old patient with a history of appendectomy who suffered from triple jejunal perforation after blind percutaneous insertion and subsequent embedment of his peritoneal catheter. Accurate diagnosis was made 1 month after insertion due to atypical clinical presentation and because physicians had no access to the peritoneal cavity after catheter embedment. After surgical repair and broad-spectrum antibiotics, the patient was switched to HD. CONCLUSION Early catheter-related visceral injury is a rare, yet threatening condition that is almost always causing a switch to hemodialysis or death. Our review highlights that laparoscopic catheter placement might bring better outcomes if perforation occurs, as it allows immediate diagnosis and treatment. On the contrary, catheter embedment may delay clinical diagnosis and therefore bring worse outcomes.
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Affiliation(s)
- Lucas Jacobs
- Nephrology and Dialysis Department, Brugmann University Hospital, Université Libre de Bruxelles, Brussels, Belgium.
| | - Mohammed Salaouatchi
- Nephrology and Dialysis Department, Brugmann University Hospital, Université Libre de Bruxelles, Brussels, Belgium
| | - Maxime Taghavi
- Nephrology and Dialysis Department, Brugmann University Hospital, Université Libre de Bruxelles, Brussels, Belgium
| | - Said Sanoussi
- Radiology Department, Brugmann University Hospital, Université Libre de Bruxelles, Brussels, Belgium
| | - Joelle Nortier
- Nephrology and Dialysis Department, Brugmann University Hospital, Université Libre de Bruxelles, Brussels, Belgium
| | - Maria Mesquita
- Nephrology and Dialysis Department, Brugmann University Hospital, Université Libre de Bruxelles, Brussels, Belgium
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Staal FC, Taghavi M, Hong EK, Tissier R, van Treijen M, Heeres BC, van der Zee D, Tesselaar ME, Beets-Tan RG, Maas M. CT-based radiomics to distinguish progressive from stable neuroendocrine liver metastases treated with somatostatin analogues: an explorative study. Acta Radiol 2023; 64:1062-1070. [PMID: 35702011 DOI: 10.1177/02841851221106598] [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: 11/17/2022]
Abstract
BACKGROUND Accurate response evaluation in patients with neuroendocrine liver metastases (NELM) remains a challenge. Radiomics has shown promising results regarding response assessment. PURPOSE To differentiate progressive (PD) from stable disease (SD) with radiomics in patients with NELM undergoing somatostatin analogue (SSA) treatment. MATERIAL AND METHODS A total of 46 patients with histologically confirmed gastroenteropancreatic neuroendocrine tumors (GEP-NET) with ≥1 NELM and ≥2 computed tomography (CT) scans were included. Response was assessed with Response Evaluation Criteria in Solid Tumors (RECIST1.1). Hepatic target lesions were manually delineated and analyzed with radiomics. Radiomics features were extracted from each NELM on both arterial-phase (AP) and portal-venous-phase (PVP) CT. Multiple instance learning with regularized logistic regression via LASSO penalization (with threefold cross-validation) was used to classify response. Three models were computed: (i) AP model; (ii) PVP model; and (iii) AP + PVP model for a lesion-based and patient-based outcome. Next, clinical features were added to each model. RESULTS In total, 19 (40%) patients had PD. Median follow-up was 13 months (range 1-50 months). Radiomics models could not accurately classify response (area under the curve 0.44-0.60). Adding clinical variables to the radiomics models did not significantly improve the performance of any model. CONCLUSION Radiomics features were not able to accurately classify response of NELM on surveillance CT scans during SSA treatment.
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Affiliation(s)
- Femke Cr Staal
- Department of Radiology, 1228The Netherlands Cancer Institute, Amsterdam, The Netherlands
- GROW School for Oncology and Developmental Biology, 5211Maastricht University Medical Centre, Maastricht, The Netherlands
- Center for Neuroendocrine Tumors, ENETS Center of Excellence, 1228Netherlands Cancer Institute Amsterdam/University Medical Center Utrecht, Utrecht, The Netherlands
| | - M Taghavi
- Department of Radiology, 1228The Netherlands Cancer Institute, Amsterdam, The Netherlands
- GROW School for Oncology and Developmental Biology, 5211Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Eun K Hong
- Department of Radiology, 1228The Netherlands Cancer Institute, Amsterdam, The Netherlands
- GROW School for Oncology and Developmental Biology, 5211Maastricht University Medical Centre, Maastricht, The Netherlands
- Department of Radiology, 26725Seoul National University Hospital, Seoul, Republic of Korea
| | - Renaud Tissier
- Biostatistics Center, 1228The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Mark van Treijen
- Center for Neuroendocrine Tumors, ENETS Center of Excellence, 1228Netherlands Cancer Institute Amsterdam/University Medical Center Utrecht, Utrecht, The Netherlands
- Department of Endocrine Oncology, 8124University Medical Centre Utrecht, Utrecht, The Netherlands
| | - Birthe C Heeres
- Department of Radiology, 1228The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | | | - Margot Et Tesselaar
- Center for Neuroendocrine Tumors, ENETS Center of Excellence, 1228Netherlands Cancer Institute Amsterdam/University Medical Center Utrecht, Utrecht, The Netherlands
- Department of Medical Oncology, 1228The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Regina Gh Beets-Tan
- Department of Radiology, 1228The Netherlands Cancer Institute, Amsterdam, The Netherlands
- GROW School for Oncology and Developmental Biology, 5211Maastricht University Medical Centre, Maastricht, The Netherlands
- Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark
| | - Monique Maas
- Department of Radiology, 1228The Netherlands Cancer Institute, Amsterdam, The Netherlands
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12
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Taghavi M, Jacobs L, Dratwa M, Nortier J. Hyponatremia in peritoneal dialysis patients. Bull Dial Domic 2022. [DOI: 10.25796/bdd.v4i4.73443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Hyponatremia is the most common disorder of body fluid and electrolyte balance encountered in clinical practice, and also in peritoneal dialysis (PD) population. Depending on the severity and the speed of drop in sodium concentration, the symptoms can vary from asymptomatic hyponatremia to mild and non-specific symptoms or severe and life-threatening situations. Hyponatremia is associated with high morbidity and mortality. Its pathophysiology is complex, specifically in patients undergoing PD. The etiological workup can be cumbersome but is of paramount importance for early and appropriate treatment. In this article, we review the clinical manifestations as well as the pathophysiology and the specific etiologies of hyponatremia in peritoneal dialysis patients, and we propose a diagnostic algorithm.
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Cubilier E, Salaouatchi MT, Taghavi M, Kaysi S, Nortier J, Mesquita MDCF. Undetected Iatrogenic Drug-Induced Complications in a Hemodialyzed Anuric Patient: A Case Report and Review of the Literature. Case Rep Nephrol Dial 2022; 12:212-218. [DOI: 10.1159/000527197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 09/11/2022] [Indexed: 11/05/2022] Open
Abstract
Anuric hemodialyzed end-stage renal disease patients are prone to multiple complications and comorbidities and are therefore often treated with various medications. Adverse drug reactions and risk factors leading to them can be difficult to discern in such polymedicated patients. Most problems regarding low phosphate levels are frequently underdiagnosed in clinical practice and sometimes overlooked in these regularly hyperphosphatemic patients. Hemodialysis vascular accesses are frequently subject to infections and therefore require adapted antibiotic treatments. We report a case of an occult severe multifactorial hypophosphatemia in an anuric hemodialyzed patient with multiple comorbidities who required two hospitalizations for encephalopathy, seizures, and cardiac failure. Retrospective analysis of the medical record revealed several underlying causes of hypophosphatemia, as well as undetected risk factors for adverse drug reactions related to cephalosporins. A global approach to these concerns in routine clinical practice would raise awareness of often disregarded issues related to hypophosphatemia and drug prescription in these patients.
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14
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Jacobs L, Clevenbergh P, Collart F, Brayer I, Mesquita M, Taghavi M, Fosso C, Kaysi S, Nortier J, Dratwa M. Conséquences de la pandémie de COVID-19 sur le taux de péritonite de dialyse péritonéale : plaidoyer pour une formation continue ininterrompue. Nephrol Ther 2022; 18:526-533. [PMID: 36241606 PMCID: PMC9492510 DOI: 10.1016/j.nephro.2022.07.401] [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: 06/12/2022] [Revised: 07/19/2022] [Accepted: 07/20/2022] [Indexed: 11/19/2022]
Abstract
Introduction La péritonite est une complication fréquente du traitement par dialyse péritonéale chronique, contribuant à l’échec de la technique et/ou au décès. Les avantages réels d’un programme de formation continue sur les taux de péritonites sont peu connus. Dans cette étude, nous avons mesuré l’influence du protocole de formation continue de nos patients sur le taux de péritonites. Nous avons également étudié les conséquences de la perturbation de notre protocole liée au Covid sur les taux de péritonites. Méthode Nous présentons nos taux annuels de péritonites depuis la mise en place de notre programme de formation continue des patients en 2010. Nous avons ensuite concentré notre étude sur trois années consécutives : 2019, 2020 (émergence de la COVID-19) et 2021, en recueillant les données microbiologiques de chaque épisode de péritonite. Des analyses statistiques ont été utilisées pour corroborer nos résultats. Résultats Depuis 2010, le taux de péritonites a diminué linéairement (R2 = 0,6556 ; df = 8 ; p < 0,01) jusqu’à son nadir en 2019 avec 4 épisodes de péritonites. La majorité des infections ont alors été traitées en ambulatoire. En 2020, notre évaluation continue des procédures de dialyse au domicile des patients a diminué de 51 % et 28 péritonites sont survenues, 47 % secondaires à des bactéries cutanées strictes, et 31 % gastro-intestinales, indépendamment de l’expérience des patients ou de la modalité de dialyse péritonéale. Le taux d’hospitalisations a atteint 71 %. Après avoir rétabli notre protocole, nous avons diminué le taux de péritonites de 50 % en 2021. Conclusions Les facteurs de risque de développer une péritonite sont identifiables et modifiables, et nécessitent des interventions soutenues, une surveillance visuelle ainsi qu’une formation continue. Ces interventions réduisent de manière significative les taux de péritonites. Toute brève interruption de l’évaluation de la technique des patients peut augmenter de manière significative les taux de péritonites.
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Affiliation(s)
- Lucas Jacobs
- Service de néphrologie et de dialyse, Centre hospitalier universitaire Brugmann, Université Libre de Bruxelles, Bruxelles, Belgique.
| | - Philippe Clevenbergh
- Clinique des maladies infectieuses, Département de médecine interne, Centre Hospitalier Universitaire Brugmann, Université Libre de Bruxelles, Bruxelles, Belgique
| | - Frédéric Collart
- Service de néphrologie et de dialyse, Centre hospitalier universitaire Brugmann, Université Libre de Bruxelles, Bruxelles, Belgique
| | - Isabelle Brayer
- Service de néphrologie et de dialyse, Centre hospitalier universitaire Brugmann, Université Libre de Bruxelles, Bruxelles, Belgique
| | - Maria Mesquita
- Service de néphrologie et de dialyse, Centre hospitalier universitaire Brugmann, Université Libre de Bruxelles, Bruxelles, Belgique
| | - Maxime Taghavi
- Service de néphrologie et de dialyse, Centre hospitalier universitaire Brugmann, Université Libre de Bruxelles, Bruxelles, Belgique
| | - Christelle Fosso
- Service de néphrologie et de dialyse, Centre hospitalier universitaire Brugmann, Université Libre de Bruxelles, Bruxelles, Belgique
| | - Saleh Kaysi
- Service de néphrologie et de dialyse, Centre hospitalier universitaire Brugmann, Université Libre de Bruxelles, Bruxelles, Belgique
| | - Joëlle Nortier
- Service de néphrologie et de dialyse, Centre hospitalier universitaire Brugmann, Université Libre de Bruxelles, Bruxelles, Belgique
| | - Max Dratwa
- Service de néphrologie et de dialyse, Centre hospitalier universitaire Brugmann, Université Libre de Bruxelles, Bruxelles, Belgique
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15
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Taghavi M, Dratwa M. Overview of ISPD 2022 guideline recommendations for peritonitis prevention and treatment. Bull Dial Domic 2022. [DOI: 10.25796/bdd.v5i2.66753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
This article is a summary of the new ISPD recommendations for peritonitis prevention and treatment. The latter recommendations bring definition clarifications, and new targets with respect to the rates of peritonitis. It also brings new recommendations on the prevention and the management of peritonitis with new guidelines regarding empirical use of antibiotics, dosage, and treatment of peritonitis due to specific microorganisms. In case of doubt or need of precisions, the original article (https://doi.org/10.1177/08968608221080586) and the exhaustive list of references that it contains should be consulted.
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Taghavi M, Stordeur P, Collart F, Dachy B, Pozdzik A, Carmo Filomena Mesquita MD, Nortier J. Interferon-beta1a-induced thrombotic microangiopathy: Possible implication of the alternative pathway of the complement. Kidney Int Rep 2022; 7:1917-1921. [PMID: 35967109 PMCID: PMC9366298 DOI: 10.1016/j.ekir.2022.05.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 04/25/2022] [Accepted: 05/02/2022] [Indexed: 11/30/2022] Open
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Taliha MD, Balti E, Maillart E, Leemans S, Taghavi M, Carausu SA, Sanoussi S, Mahadeb B, Clevenbergh P. Invasive non-typhoidal Salmonella infection complicated by metastatic infections: report of three cases. IDCases 2022; 28:e01498. [PMID: 35479107 PMCID: PMC9036139 DOI: 10.1016/j.idcr.2022.e01498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Revised: 04/04/2022] [Accepted: 04/06/2022] [Indexed: 11/30/2022] Open
Abstract
Non-typhoidal Salmonella (NTS) disease is usually a self-limiting infection presenting with digestive symptoms. However, disseminated presentation with involvement of secondary infectious sites is observed. We report diagnostic specificities and challenges related to the management of three patients with invasive NTS (iNTS) and secondary infectious locations. Among the seven patients (age range 46 – 83 years), four (two with extra-digestive infectious sites) had at least one immune debilitating condition. Two patients were incidentally discovered with iNTS and deceased after developing a septic shock despite antimicrobial treatment. Two individuals recovered under medical treatment without complications. Three other patients presented with secondary infectious sites. Case 1 suffered from urinary tract infection and dorsolumbar spondylodiscitis that responded well to antimicrobials and surgery. Abdominal prosthetic aortic aneurysm was diagnosed in case 2 and medical treatment only was applied. After four years of follow-up, he remains under antimicrobial treatment. Case 3 presented with conjoint thoracic aortic aneurysm and cutaneous abscesses managed with antimicrobials and surgery. Atherosclerosis and previous vascular intervention were the predisposing events for vascular involvement. iNTS is a serious disease carrying a high risk of mortality or secondary locations. Secondary locations can be managed by long duration antimicrobial therapy combined with surgery. Spine and aortitis are the most frequent secondary locations. Multi-drug resistant NTS represent an additional risk of mortality. Public health measures should be implemented to limit the spread of NTS to humans and the emergence of drug resistance.
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Affiliation(s)
- Mariana Dumitru Taliha
- Department of Internal Medicine, Division of Geriatric Medicine, Brugmann University Hospital, Brussels, Belgium
| | - Eric Balti
- Department of Internal Medicine, Brugmann University Hospital, Brussels, Belgium
- Corresponding author.
| | - Evelyne Maillart
- Department of Medicine, Infectious Disease Unit, Brugmann University Hospital, Brussels, Belgium
| | - Sophie Leemans
- Department of Medicine, Infectious Disease Unit, Brugmann University Hospital, Brussels, Belgium
| | - Maxime Taghavi
- Department of Medicine, Nephrology Unit, Brugmann University Hospital, Brussels, Belgium
| | - Sergiu-Andrei Carausu
- Department of Cardiovascular and Thoracic Surgery, Saint-Luc University Hospital, Brussels, Belgium
| | - Said Sanoussi
- Department of Radiology, University Hospital Brugmann, Brussels, Belgium
| | - Bhavna Mahadeb
- Department of Microbiology, Universitair Laboratorium Brussel (LHUB-ULB), Brussels, Belgium
| | - Philippe Clevenbergh
- Department of Medicine, Infectious Disease Unit, Brugmann University Hospital, Brussels, Belgium
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18
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Jacobs L, Salif A, Calderon Plazarte V, Alcan I, Taghavi M. Iatrogenic obstructive acute kidney injury due to suprapubic catheterization. Oxf Med Case Reports 2022; 2022:omac011. [PMID: 35198231 PMCID: PMC8858389 DOI: 10.1093/omcr/omac011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 12/14/2021] [Accepted: 01/11/2022] [Indexed: 11/13/2022] Open
Affiliation(s)
- Lucas Jacobs
- Nephrology Clinic, Internal Medicine Department, Brugmann University Hospital, Brussels, Belgium
| | - Ayemane Salif
- Nephrology Clinic, Internal Medicine Department, Brugmann University Hospital, Brussels, Belgium
| | | | - Ibrahim Alcan
- Radiology Department, Brugmann University Hospital, Brussels, Belgium
| | - Maxime Taghavi
- Nephrology Clinic, Internal Medicine Department, Brugmann University Hospital, Brussels, Belgium
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Taghavi M, Jacobs L, Kaysi S, Mesquita MDCF. Hemolysis in a Patient during Hemodialysis. Case Rep Nephrol Dial 2021; 11:348-354. [PMID: 35083290 PMCID: PMC8740279 DOI: 10.1159/000520559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 10/28/2021] [Indexed: 12/03/2022] Open
Abstract
We report a case of hemolysis during a hemodialysis (HD) session in a 71-year-old man. His end-stage kidney disease is secondary to light-chain amyloidosis with renal involvement. Despite immunosuppressive treatment, his renal function continued to decline, and dialysis had to be initiated. Peritoneal dialysis (PD) was started but that had to be converted to HD because of pleural effusion due to PD fluid leakage. On the event day, the patient presented a respiratory distress 2 h after the initiation of HD. He developed a sudden onset of dyspnea with hypoxemia, associated with abdominal pain, nausea, and vomiting. He also presented chest pain with arterial hypertension. The pre-pump arterial and post-pump pressures were, respectively, 40 and 100 mm Hg, with no machine alarm. The blood color in the circuit changed and became darker, so HD was stopped immediately without blood restitution, and then a blood workup was obtained, and the patient was treated with oxygen therapy, IV methylprednisolone 40 mg, and IV furosemide 100 mg. Tubing checkup performed after the incident showed a kinked arterial tube which led to the suspicion of acute hemolysis. Blood transfusion was therefore urgently ordered, and the patient was immediately transferred to the intensive care unit (ICU). Artificial ventilation was required for 4 days, with initial massive blood transfusion. A 24-h treatment with extracorporeal cytokine adsorber CytoSorb<sup>®</sup> was also performed, followed by the regular HD sessions thrice weekly. Evolution was favorable, and the patient was discharged from the ICU 18 days later.
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20
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Staal FCR, Taghavi M, van der Reijd DJ, Gomez FM, Imani F, Klompenhouwer EG, Meek D, Roberti S, de Boer M, Lambregts DMJ, Beets-Tan RGH, Maas M. Predicting local tumour progression after ablation for colorectal liver metastases: CT-based radiomics of the ablation zone. Eur J Radiol 2021; 141:109773. [PMID: 34022475 DOI: 10.1016/j.ejrad.2021.109773] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2020] [Revised: 04/23/2021] [Accepted: 05/10/2021] [Indexed: 01/18/2023]
Abstract
PURPOSE To assess whether CT-based radiomics of the ablation zone (AZ) can predict local tumour progression (LTP) after thermal ablation for colorectal liver metastases (CRLM). MATERIALS AND METHODS Eighty-two patients with 127 CRLM were included. Radiomics features (with different filters) were extracted from the AZ and a 10 mm periablational rim (PAR)on portal-venous-phase CT up to 8 weeks after ablation. Multivariable stepwise Cox regression analyses were used to predict LTP based on clinical and radiomics features. Performance (concordance [c]-statistics) of the different models was compared and performance in an 'independent' dataset was approximated with bootstrapped leave-one-out-cross-validation (LOOCV). RESULTS Thirty-three lesions (26 %) developed LTP. Median follow-up was 21 months (range 6-115). The combined model, a combination of clinical and radiomics features, included chemotherapy (HR 0.50, p = 0.024), cT-stage (HR 10.13, p = 0.016), lesion size (HR 1.11, p = <0.001), AZ_Skewness (HR 1.58, p = 0.016), AZ_Uniformity (HR 0.45, p = 0.002), PAR_Mean (HR 0.52, p = 0.008), PAR_Skewness (HR 1.67, p = 0.019) and PAR_Uniformity (HR 3.35, p < 0.001) as relevant predictors for LTP. The predictive performance of the combined model (after LOOCV) yielded a c-statistic of 0.78 (95 %CI 0.65-0.87), compared to the clinical or radiomics models only (c-statistic 0.74 (95 %CI 0.58-0.84) and 0.65 (95 %CI 0.52-0.83), respectively). CONCLUSION Combining radiomics features with clinical features yielded a better performing prediction of LTP than radiomics only. CT-based radiomics of the AZ and PAR may have potential to aid in the prediction of LTP during follow-up in patients with CRLM.
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Affiliation(s)
- F C R Staal
- Department of Radiology, Antoni van Leeuwenhoek - The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands; GROW School for Oncology and Developmental Biology, Maastricht University Medical Centre, Universiteitssingel 40, 6229 ER Maastricht, the Netherlands.
| | - M Taghavi
- Department of Radiology, Antoni van Leeuwenhoek - The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands; GROW School for Oncology and Developmental Biology, Maastricht University Medical Centre, Universiteitssingel 40, 6229 ER Maastricht, the Netherlands
| | - D J van der Reijd
- Department of Radiology, Antoni van Leeuwenhoek - The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands; GROW School for Oncology and Developmental Biology, Maastricht University Medical Centre, Universiteitssingel 40, 6229 ER Maastricht, the Netherlands
| | - F M Gomez
- Department of Radiology, Antoni van Leeuwenhoek - The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands; Department of Radiology, Hospital Clinic de Barcelona, Carrer de Villarroel, 170, 08036 Barcelona, Spain
| | - F Imani
- Department of Radiology, Antoni van Leeuwenhoek - The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands
| | - E G Klompenhouwer
- Department of Radiology, Antoni van Leeuwenhoek - The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands
| | - D Meek
- Department of Radiology, Antoni van Leeuwenhoek - The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands
| | - S Roberti
- Department of Epidemiology and Biostatistics, Antoni van Leeuwenhoek - The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands
| | - M de Boer
- Department of Radiology, Antoni van Leeuwenhoek - The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands
| | - D M J Lambregts
- Department of Radiology, Antoni van Leeuwenhoek - The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands
| | - R G H Beets-Tan
- Department of Radiology, Antoni van Leeuwenhoek - The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands; GROW School for Oncology and Developmental Biology, Maastricht University Medical Centre, Universiteitssingel 40, 6229 ER Maastricht, the Netherlands; Institute of Regional Health Research, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
| | - M Maas
- Department of Radiology, Antoni van Leeuwenhoek - The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands.
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Abstract
Soft robotics has applications in myriad fields from assistive wearables to autonomous exploration. Now, the portability and the performance of many devices are limited by their associated pneumatic energy source, requiring either large, heavy pressure vessels or noisy, inefficient air pumps. Here, we present a lightweight, flexible, electro-pneumatic pump (EPP), which can silently control volume and pressure, enabling portable, local energy provision for soft robots, overcoming the limitations of existing pneumatic power sources. The EPP is actuated using dielectric fluid-amplified electrostatic zipping, and the device presented here can exert pressures up to 2.34 kilopascals and deliver volumetric flow rates up to 161 milliliters per minute and under 0.5 watts of power, despite only having a thickness of 1.1 millimeters and weight of 5.3 grams. An EPP was able to drive a typical soft robotic actuator to achieve a maximum contraction change of 32.40% and actuation velocity of 54.43% per second. We highlight the versatility of this technology by presenting three EPP-driven embodiments: an antagonistic mechanism, an arm-flexing wearable robotic device, and a continuous-pumping system. This work shows the wide applicability of the EPP to enable advanced wearable assistive devices and lightweight, mobile, multifunctional robots.
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Affiliation(s)
- R S Diteesawat
- Department of Engineering Mathematics, University of Bristol, Bristol BS8 1BU, UK.,Bristol Robotics Laboratory, Bristol BS16 1QY, UK
| | - T Helps
- Department of Engineering Mathematics, University of Bristol, Bristol BS8 1BU, UK.,Bristol Robotics Laboratory, Bristol BS16 1QY, UK
| | - M Taghavi
- Department of Engineering Mathematics, University of Bristol, Bristol BS8 1BU, UK.,Bristol Robotics Laboratory, Bristol BS16 1QY, UK
| | - J Rossiter
- Department of Engineering Mathematics, University of Bristol, Bristol BS8 1BU, UK. .,Bristol Robotics Laboratory, Bristol BS16 1QY, UK
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Taheri B, Taghavi M, Zarei M, Chamkouri N, Mojaddami A. Imidazole and carbazole derivatives as potential anticancer agents: molecular docking studies and cytotoxic activity evaluation. B CHEM SOC ETHIOPIA 2020. [DOI: 10.4314/bcse.v34i2.14] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Carbazoles and imidazole represent two important classes of heterocycles which exhibit diverse biological activities such as antitumor properties. In this study, imidazole (C1-C3) and carbazole (C4 and C5) derivatives were evaluated for their cytotoxic activity against three human cancer cell lines namely, MCF7 (human breast cancer), HT29 (human colon cancer), and HeLa (human cervical cancer). Carbazole derivatives (C4 and C5) with IC50 < 10 µM showed greater cytotoxic effect than imidazole derivatives (C1-C3). Furthermore, all compounds exhibited better anticancer activity against MCF-7 than other two cell lines (HT-29, HeLa) and compound C4 was the most potent compound with the IC50 values of 2.5, 5.4 and 4.0 µM, against MCF-7, Hela and HT-29 cell lines, respectively. Physicochemical properties of compounds were calculated and their correlation with the IC50 values on MCF-7 cell line investigated. Surface area and polarizability of compounds showed good correlation by R2 = 0.8396 and R2 = 0.834, respectively. Docking studies of these compounds were also performed on the DNA as proposed target to comprehend their binding interactions and binding energies. The docking energy of compounds ranged from - 11.32 to -13.48 kcal/mol. Compound C3 with energy of -13.48 kcal/mol had the highest docking energy. Docking results indicated that these compounds (C1-C5) had strong affinity in binding to the DNA.
KEY WORDS: Imidazole, Carbazole, Molecular docking, Cancer, MTT assay
Bull. Chem. Soc. Ethiop. 2020, 34(2), 377-384
DOI: https://dx.doi.org/10.4314/bcse.v34i2.14
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23
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Taghavi M, Stinchcombe A, Greenman J, Mattoli V, Beccai L, Mazzolai B, Melhuish C, Ieropoulos IA. Self sufficient wireless transmitter powered by foot-pumped urine operating wearable MFC. Bioinspir Biomim 2015; 11:016001. [PMID: 26657063 DOI: 10.1088/1748-3190/11/1/016001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The first self-sufficient system, powered by a wearable energy generator based on microbial fuel cell (MFC) technology is introduced. MFCs made from compliant material were developed in the frame of a pair of socks, which was fed by urine via a manual gaiting pump. The simple and single loop cardiovascular fish circulatory system was used as the inspiration for the design of the manual pump. A wireless programmable communication module, engineered to operate within the range of the generated electricity, was employed, which opens a new avenue for research in the utilisation of waste products for powering portable as well as wearable electronics.
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Affiliation(s)
- M Taghavi
- Bristol BioEnergy Centre, Bristol Robotics Laboratory, University of the West of England, Bristol, BS16 1QY, UK. Center for Micro-BioRobotics, Istituto Italiano di Tecnologia, Viale Rinaldo Piaggio 34, I-56025 Pontedera (PI), Italy
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Khosravi AR, Shokri H, Darvishi S, Taghavi M. Immunomodulatory efficacy of ethanol extract of propolis on tumor-bearing mice with disseminated candidiasis. J Mycol Med 2014; 24:e143-8. [PMID: 25442915 DOI: 10.1016/j.mycmed.2014.05.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [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: 01/01/2014] [Revised: 04/26/2014] [Accepted: 05/15/2014] [Indexed: 01/21/2023]
Abstract
OBJECTIVE This study was aimed at investigating the effect of propolis on immunosurveillance by measuring the levels of serum interleukin (IL)-4, IL-10, IL-17, tumor necrosis factor (TNF)-α and interferon (IFN)-γ in tumor-bearing mice with disseminated candidiasis. METHODS The ethanol extract of propolis was selected for this study. Balb/C female mice were infected with Candida albicans (C. albicans) and inoculated with spontaneous mouse mammary tumor (SMMT). The serum levels of tissue inhibitor of metalloproteinase-1(TIMP-1) were assessed by enzyme- linked immunosorbent assay (ELISA). Mice were treated daily with propolis solution (100mg/kg, 0.1 mL, orally) for 3 days before IV challenge with C. albicans and SC challenge with SMMT and continued for 10 days. The rates of survival and tumor growth of understudy mice were investigated as well. The levels of TNF-α, IFN-γ, IL-4, IL-10 and IL-17 cytokines in culture supernatants were determined by ELISA. RESULTS The mean tumor size was significantly increased in tumor-bearing mice infected with C. albicans (16.98 ± 0.49 mm(2)) as compared to other mice groups (P<0.05). The results showed a significant decline of IL-4 and IL-10 levels after propolis administration to tumor-bearing mice infected with C. albicans (53.41 pg/mL, 156.81 pg/mL and 63.45 pg/mL) (P < 0.05). The increment of TNF-α (433.85 pg/mL) and IFN-γ (120.43 pg/mL) levels were also observed. CONCLUSION Data revealed that propolis has remarkable immunomodulatory effect, which provides a scientific validation for the popular use of this natural substance, and further investigation will help to understand propolis usefulness during immunosuppressive conditions.
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MESH Headings
- Animals
- Anti-Infective Agents/chemistry
- Anti-Infective Agents/pharmacology
- Candida albicans
- Candidiasis/complications
- Candidiasis/immunology
- Candidiasis/pathology
- Carcinoma, Ductal, Breast/complications
- Carcinoma, Ductal, Breast/immunology
- Carcinoma, Ductal, Breast/pathology
- Ethanol
- Female
- Immunomodulation/drug effects
- Mammary Neoplasms, Animal/complications
- Mammary Neoplasms, Animal/immunology
- Mammary Neoplasms, Animal/pathology
- Mice
- Mice, Inbred BALB C
- Propolis/chemistry
- Propolis/pharmacology
- Treatment Outcome
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Affiliation(s)
- A R Khosravi
- Mycology Research Center, Faculty of Veterinary Medicine, University of Tehran, PO Box 14155-6453, Azadi street, Tehran, Iran.
| | - H Shokri
- Faculty of Veterinary Medicine, Amol University of Special Modern Technologies, Amol, Iran
| | - S Darvishi
- Mycology Research Center, Faculty of Veterinary Medicine, University of Tehran, PO Box 14155-6453, Azadi street, Tehran, Iran
| | - M Taghavi
- Mycology Research Center, Faculty of Veterinary Medicine, University of Tehran, PO Box 14155-6453, Azadi street, Tehran, Iran
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Wiese CHR, Duttge G, Taghavi M, Lassen CL, Meyer N, Andreesen R, Graf BM, Pfirstinger J. [Preventive crisis management in general outpatient palliative care - prospectively cross-sectional study of General Practitioners in Eastern Bavaria]. Dtsch Med Wochenschr 2011; 136:2302-7. [PMID: 22048935 DOI: 10.1055/s-0031-1292043] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Abstract
BACKGROUND General out-patient palliative care (GOPC) must be integrated into the care of patients with life-limiting diseases. Aim of the study was to evaluate experiences of general practitioners concerning advance directives and palliative emergency sheets. METHODS A self-provided survey was mailed to all general practitioners in Regensburg (cross-sectional study). Main outcome measures included responses regarding a palliative emergency sheet (PES) and a palliative emergency plan (PEP). The investigation period was four months. The analysis was performed using defined criteria (e. g. professional experience concerning palliative care patients, patients treated in nursing homes, patients with dementia). RESULTS Sixty-nine questionnaires from 259 were analysed (response rate 27 %). 86 % of respondents named practical experience in the care of palliative patients, 46 % named theoretical knowledge in this field. 41 % and 40 % consider creating an advance directive for their practical work as important/very important (p = 0.004 concerning the treatment of more than five palliative care patients per three months). 52 % and 49 % regard a PES or a PEP to be relevant (PES median: 6.5, SD ± 2.7; PEP median: 6.5 SD ± 2.9; inter-group analysis p < 0.05). 94 % of respondents name the general practitioner to be suitable for creating an advance directive. CONCLUSION In Germany, GOPC in end-of-life care is very important. This study shows that advance directives were declared as an important instrument for patients? autonomy. The sense of PES and PEP to ensure patients? autonomy, especially for acute emergency medical palliative care, must be better recognized. However, the increase in acceptance in the GOPC for such instruments must be disclosed. Further studies to investigate this problem are necessary.
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Affiliation(s)
- C H R Wiese
- Klinik für Anästhesiologie, Klinikum der Universität Regensburg.
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Taghavi M, Bahrami M. Design and simulation of a micro-channel for separating the particles with nearly constant dielectrophoretic force in channel space. Molecular Simulation 2011. [DOI: 10.1080/08927022.2011.569548] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Wiese C, Löffler E, Vormelker J, Meyer N, Taghavi M, Strumpf M, Kazmaier S, Roessler M, Zausig Y, Popov A, Lassen C, Graf B, Hanekop G. Kenntnisse angehender Notfallmediziner über die Tumorschmerztherapie bei Palliativpatienten. Schmerz 2010; 24:508-16. [DOI: 10.1007/s00482-010-0956-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Razavi ME, Abotoraby RB, Kakhki RD, Ghanavati SZ, Layegh P, Taghavi M, Rajabian MT. Clinical evaluation of Graves ophthalmopathy in north-east Islamic Republic of Iran. East Mediterr Health J 2008; 14:841-849. [PMID: 19166167] [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] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
This study evaluated the prevalence and severity of ophthalmic manifestations in all Graves disease patients (n = 68) presenting to endocrine clinics at Mashad University of Medical Sciences between December 2002 and September 2005. The mean age of patients was 38.0 (SD 14.0) years, range 15 to 71 years. The most common complaints were foreign body sensation (54.0%) and puffy eyelids (48.4%). The most common apparent abnormality was lid retraction in 64.2% of patients (bilateral in 95.3% of cases). The patients had a mean modified Werner's NO SPECS classification score of 3.00 (SD 1.46). The score was significantly higher in males than females [3.58 (SD 1.44) versus 2.63 (SD 1.35)] and was positively correlated with age.
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Affiliation(s)
- M E Razavi
- Department of Ophthalmology, Khatam-Al-Anbia Eye Hospital, Medical University of Mashad, Mashad, Islamic Republic of Iran.
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Dehghani M, Nasseri S, Amin S, Naddafee K, Taghavi M, Yunesian M, Maleky N. Isolation and identification of atrazine-degrading bacteria from corn field soil in Fars province of Iran. Pak J Biol Sci 2007; 10:84-9. [PMID: 19069990 DOI: 10.3923/pjbs.2007.84.89] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In this study several agricultural fields with a long history of atrazine application in Fars province of Iran have been explored for their potential of atrazine biodegradation. After several subculturing for a period of 300 days acclimation, leads to an enhancement of atrazine biodegradation rate. A successful enrichment culture with a high capability for atrazine degradation was obtained (88%). A combination of enrichment culture technique, in a basal salt medium containing atrazine and carbon sources under nitrogen limitation and plating on indicator atrazine agar, have permitted the isolation of bacterial consortium with high capability of using atrazine as a nitrogen source. Seven gram-negative and one gram-positive bacterial strain, which were able to use this herbicide as a sole source of nitrogen, were isolated from Darehasalouie Kavar corn field soil. Based on physiological, biochemical and nutritional characteristics, the isolated bacteria were identified as Pseudomonas alcaligenes, Acidovorax sp., Pseudomonas putida, Ralstonia eutrophus, Pseudomonas syiringe, Erwinia tracheiphila, Entrobacter agglomerans and Micrococcus varians. Therefore, the bacterial consortium in liquid culture containing carbon sources and atrazine as a sole source of nitrogen, degrade added atrazine more than 80%.
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Affiliation(s)
- M Dehghani
- Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
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Taghavi M, Shojaee Fard A, Mehrsai R, Shadman M. Late onset anastomotic pseudoaneurysm of renal allograft artery: case report, diagnosis, and treatment. Transplant Proc 2006; 37:4297-9. [PMID: 16387101 DOI: 10.1016/j.transproceed.2005.10.110] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [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: 01/28/2005] [Indexed: 11/26/2022]
Abstract
A large, late onset, extrarenal pseudoaneurysm at the anastomotic site of the renal allograft artery is reported herein. The patient was a 25-year-old woman who presented 2 months after a normal vaginal delivery. She had received a renal allograft 6 years before admission without any renal compliants after transplantation. She presented with lower abdominal pain and an elevated creatinine level. Digital subtraction angiography revealed a pseudoaneurysm at the anastomotic site; surgical treatment was performed via a venous patch angioplasty. She has been followed postoperatively for 18 months with normal kidney function and without any other renal or vascular problems.
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Affiliation(s)
- M Taghavi
- Department of Vascular Surgery, Sina General Hospital, Tehran University of Medical Sciences, Tehran, Islamic Republic of Iran.
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Farid R, Ghaffari J, Taghavi M, Rafatpanah H, Jabbari-azad F. Evaluation and association of anti-thyroid antibodies with Chronic Idiopathic Urticaria. J Allergy Clin Immunol 2005. [DOI: 10.1016/j.jaci.2004.12.718] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Sly LI, Taghavi M, Fegan M. Phylogenetic position of Chitinophaga pinensis in the Flexibacter-Bacteroides-Cytophaga phylum. Int J Syst Bacteriol 1999; 49 Pt 2:479-81. [PMID: 10319467 DOI: 10.1099/00207713-49-2-479] [Citation(s) in RCA: 24] [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] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Comparison of the 16S rRNA gene sequence determined for Chitinophaga pinensis showed that this species is most closely related to Flexibacter filiformis in the Flexibacter-Bacteroides-Cytophaga phylum. These two chitinolytic bacteria, which are characterized by transformation into spherical bodies on ageing, belong to a strongly supported lineage that also includes Cytophaga arvensicola, Flavobacterium ferrugineum and Flexibacter sancti. The lineage is distinct from the microcyst-forming species Sporocytophaga myxococcoides.
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Affiliation(s)
- L I Sly
- Department of Microbiology, University of Queensland, Brisbane, Australia
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Sly LI, Taghavi M, Fegan M. Phylogenetic heterogeneity within the genus Herpetosiphon: transfer of the marine species Herpetosiphon cohaerens, Herpetosiphon nigricans and Herpetosiphon persicus to the genus Lewinella gen. nov. in the Flexibacter-Bacteroides-Cytophaga phylum. Int J Syst Bacteriol 1998; 48 Pt 3:731-7. [PMID: 9734027 DOI: 10.1099/00207713-48-3-731] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Analysis of the 16S rDNA sequences of species currently assigned to the genus Herpetosiphon revealed intrageneric phylogenetic heterogeneity. The thermotolerant freshwater species Herpetosiphon geysericola is most closely related to the type species Herpetosiphon aurantiacus in the Chloroflexus subdivision of the green non-sulfur bacteria. The marine species Herpetosiphon cohaerens, Herpetosiphon nigricans and Herpetosiphon persicus, on the other hand, were found to form a cluster with sheathed bacterium Haliscomenobacter hydrossis in the Saprospira group of the Flexibacter-Bacteroides-Cytophaga (FBC) phylum. A proposal is made to transfer these marine species to the genus Lewinella gen. nov. as Lewinella cohaerens comb. nov., Lewinella nigricans comb. nov. and Lewinella persica comb. nov. The marine sheathed gliding bacterium Flexithrix dorotheae was also found to be a member of the FBC phylum but on a separate phylogenetic line to the marine herpetosiphons now assigned to the genus Lewinella.
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Affiliation(s)
- L I Sly
- Department of Microbiology, University of Queensland, Brisbane, Australia.
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Abstract
Irritable bowel syndrome (IBS), a chronic disorder that includes symptoms such as abdominal pain and altered bowel habits, affects up to 22% of people in Western populations. The causes of IBS are not well understood, but are believed to be multifactorial. Although stress is widely believed to be implicated, empirical evidence in support of this is lacking, perhaps because a typical between-participants analysis ignores individual differences and therefore may obscure any link. The present study used a within-person, lagged time-series approach to investigate the links between everyday stress and symptomatology in 31 IBS sufferers. Both everyday stress and symptomatology exhibited serial dependence for a statistically significant proportion of sufferers. Multiple regression analysis carried out on same-day and lagged relationships up to and including 4 days found that, for over half the participants, everyday stress and symptoms were related. The best regression model was one in which symptoms were a function of hassles and symptoms on the previous 2 days, and hassles on the same day, fitting the data for 67% of participants. This prospective study confirms other studies that have suggested stress is a significant factor in IBS, and concludes that stress management programs may be both useful and cost-effective in the treatment of IBS.
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Affiliation(s)
- C P Dancey
- Psychology Department, University of East London, UK.
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Aubin RA, Weinfeld M, Taghavi M, Mirzayans R, Paterson MC. Highly effective delivery of foreign DNA to adherent cells via polybrene/DMSO-assisted gene transfer. Methods Mol Biol 1997; 62:319-42. [PMID: 9108531 DOI: 10.1385/0-89603-480-1:319] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- R A Aubin
- Life Sciences Division-Biotechnology, Sir F. G. Banting Research Centre, Health Canada, Ottawa, Ontario, Canada
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Taghavi M, Hayward C, Sly LI, Fegan M. Analysis of the phylogenetic relationships of strains of Burkholderia solanacearum, Pseudomonas syzygii, and the blood disease bacterium of banana based on 16S rRNA gene sequences. Int J Syst Bacteriol 1996; 46:10-5. [PMID: 8573483 DOI: 10.1099/00207713-46-1-10] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
We determined nearly complete 16S rRNA gene sequences for 19 isolates of Burkholderia solanacearum, three isolates of the blood disease bacterium of bananas, and two isolates of Pseudomonas syzygii, the cause of Sumatra disease of cloves. The dendrogram produced by comparing all of these sequences revealed that there were two divisions, which corresponded to the results obtained previously in a restriction fragment length polymorphism analysis (D. Cook, E. Barlow, and L. Sequeira, Mol. Plant Microbe Interact. 2:113-121, 1989) and a total 16S ribosomal DNA (rDNA) sequence analysis of four isolates representing four biovars of B. solanacearum (X. Li, M. Dorsch, T. Del Dot, L. I. Sly, E. Stackebrandt, and A. C. Hayward, J. Appl. Bacteriol. 74:324-329, 1993). Division 1 comprised biovars 3, 4, and 5 and an aberrant biovar 2 isolate (strain ACH0732), and division 2 included biovars 1, 2, and N2, the blood disease bacterium, and P. syzygii. Specific nucleotides at positions 458 to 460 (UUC) and 474 (A) characterized division 2, whereas in division 1 the nucleotides at these positions were ACU and U, respectively. However, strain ACH0732 had a U at position 458, as did division 2 isolates, and G instead of U at position 474. Division 2 consisted of two subdivisions; one subdivision contained two B. solanacearum isolates that originated from Indonesia, P. syzygii strains, and blood disease bacterium strains, and the other subdivision contained all of the other division 2 isolates. Within division 1, the level of 16S rDNA sequence similarity ranged from 99.8 to 100%, and within division 2, the levels of 16S rDNA sequence similarity ranged from 99.1 to 100%. The division 1 isolates exhibited an average level of 16S rDNA sequence similarity to division 2 isolates of 99.3% (range, 99.1 to 99.5%). The occurrence of consistent polymorphisms in the 16S rDNA sequences of B. solanacearum strains, in particular unique 16S rDNA sequence differences in aberrant biovar 2 isolate ACH0732, and the occurrence of the Indonesian subdivision of division 2 suggest that this group is a rapidly evolving (tachytelic) group.
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Affiliation(s)
- M Taghavi
- Cooperative Research Centre for Tropical Plant Pathology, University of Queensland, Brisbane, Australia
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