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5 results on '"Karine Nubret-Le Coniat"'

1. Optimization of heart allocation: The transplant risk score

Author

Erwan Flecher, Christian Jacquelinet, Olivier Bastien, Karine Nubret‐Le Coniat, Benoît Audry, Camille Legeai, Christelle Cantrelle, Richard Dorent, and C. Jasseron

Subjects
Adult, Male, medicine.medical_specialty, Tissue and Organ Procurement, Waiting Lists, Heart disease, medicine.medical_treatment, Population, 030230 surgery, Risk Assessment, 03 medical and health sciences, 0302 clinical medicine, Risk Factors, Internal medicine, Humans, Immunology and Allergy, Medicine, Pharmacology (medical), Postoperative Period, Derivation, education, Aged, Proportional Hazards Models, Heart Failure, Mechanical ventilation, Transplantation, education.field_of_study, Framingham Risk Score, business.industry, Proportional hazards model, Graft Survival, Reproducibility of Results, Middle Aged, medicine.disease, Tissue Donors, Cardiac surgery, Multivariate Analysis, Cohort, Cardiology, Heart Transplantation, Female, France, business, Algorithms
Abstract

The new French heart allocation system is designed to minimize waitlist mortality and extend the donor pool without a detrimental effect on posttransplant survival. This study was designed to construct a 1-year posttransplant graft-loss risk score incorporating recipient and donor characteristics. The study included all adult first single-organ recipients transplanted between 2010 and 2014 (N = 1776). This population was randomly divided in a 2:1 ratio into derivation and validation cohorts. The association of variables with 1-year graft loss was determined with a mixed Cox model with center as random effect. The predictors were used to generate a transplant-risk score (TRS). Donor-recipient matching was assessed using 2 separate recipient- and donor-risk scores. Factors associated with 1-year graft loss were recipient age >50 years, valvular cardiomyopathy and congenital heart disease, previous cardiac surgery, diabetes, mechanical ventilation, glomerular filtration rate and bilirubin, donor age >55 years, and donor sex: female. The C-index of the final model was 0.70. Correlation between observed and predicted graft loss rate was excellent for the overall cohort (r = 0.90). Hearts from high-risk donors transplanted to low-risk recipients had similar survival as those from low-risk donors. The TRS provides an accurate prediction of 1-year graft-loss risk and allows optimal donor-recipient matching.

Published
2019
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2. Overcoming non-specific binding to measure the active concentration and kinetics of serum anti-HLA antibodies by surface plasmon resonance

Author

Jean-Luc Taupin, Claire Dromer, Jonathan Visentin, Pierre Merville, Martine Neau-Cransac, Vincent Veniard, Carmelo Di Primo, Gwendaline Guidicelli, Karine Nubret-le Coniat, and Lionel Couzi

Subjects
0301 basic medicine, Kinetics, Biomedical Engineering, Biophysics, Biosensing Techniques, Human leukocyte antigen, Antibodies, 03 medical and health sciences, Limit of Detection, Electrochemistry, Humans, Surface plasmon resonance, Oligonucleotide Array Sequence Analysis, Detection limit, biology, Chemistry, Histocompatibility Antigens Class I, General Medicine, Surface Plasmon Resonance, Fluorescence, Receptor–ligand kinetics, 030104 developmental biology, biology.protein, Antibody, Biosensor, Biotechnology
Abstract

Human leukocyte antigen (HLA) donor-specific antibodies are key serum biomarkers for assessing the outcome of transplanted patients. Measuring their active concentration, i.e. the fraction that really interacts with donor HLA, and their affinity could help deciphering their pathogenicity. Surface plasmon resonance (SPR) is recognized as the gold-standard for measuring binding kinetics but also active concentrations, without calibration curves. SPR-based biosensors often suffer from non-specific binding (NSB) occurring with the sensor chip surface and the immobilized targets, especially for complex media such as human serum. In this work we show that several serum treatments such as dialysis or IgG purification reduce NSB but insufficiently for SPR applications. We then demonstrate that the NSB contribution to the SPR signal can be eliminated to determine precisely and reliably the active concentration and the affinity of anti-HLA antibodies from patients' sera. This was achieved even at concentrations close to the limit of quantification of the method, in the 0.5–1 nM range. The robustness of the assay was demonstrated by using a wide range of artificially generated NSB and by varying the density of the targets captured onto the surface. The assay is of general interest and can be used with molecules generating strong NSB, as far as a non-cognate target structurally close to the target can be captured on the same flow cell, in a different binding cycle. Compared with current fluorescence-based methods that are semi-quantitative, we expect this SPR-based assay to help better understanding anti-HLA antibodies pathogenicity and improving organ recipients’ management.

Published
2018
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3. Independent risk factors for ICU mortality after left ventricular assist device implantation

Author

Marianne Piffard, Alexandre Ouattara, Alain Remy, Olivier Simon, Karine Nubret-Le Coniat, Laurent Barandon, and Sébastien Leuillet

Subjects
Male, Time Factors, medicine.medical_treatment, Medicine (miscellaneous), 02 engineering and technology, 030204 cardiovascular system & hematology, Ventricular Function, Left, law.invention, 0302 clinical medicine, law, Risk Factors, Hospital Mortality, Heart transplantation, Mortality rate, General Medicine, Middle Aged, Intensive care unit, Intensive Care Units, Treatment Outcome, Cardiology, Female, Adult, medicine.medical_specialty, Multiple Organ Failure, 0206 medical engineering, Biomedical Engineering, Bioengineering, Prosthesis Design, Risk Assessment, Biomaterials, Prosthesis Implantation, 03 medical and health sciences, Young Adult, Internal medicine, medicine, Humans, Renal replacement therapy, Aged, Retrospective Studies, Mechanical ventilation, Heart Failure, business.industry, Stroke Volume, Perioperative, equipment and supplies, 020601 biomedical engineering, Respiration, Artificial, Respiratory failure, Ventricular assist device, Heart-Assist Devices, business
Abstract

Left ventricular assist devices (LVADs) are used as an alternative therapy for heart transplantation in patients with advanced heart failure. However, the mortality rate of these patients remains relatively high. A large proportion of deaths after LVAD implantation occur during intensive care unit (ICU) stay. We conducted a retrospective study to identify the risk factors for all-cause ICU mortality in patients with an implanted LVAD. Between January 1, 2008 and December 31, 2016, 70 consecutive patients who had received an LVAD were analyzed. The median ICU length of stay was 14 days (IQR: 8-31) and 16 patients (22.9% [95%CI: 13.1-32.7]) died in the ICU. The 90-day mortality rate was 25.7% (95%CI: 15.5-35.9). The main causes of ICU mortality were: multiple organ failure, stroke, and hemorrhagic events. The univariate analysis identified the following perioperative risk factors for all-cause ICU mortality: hypertension, preoperative platelet count, preoperative white cell count, inotropic support before LVAD implantation, mechanical ventilation before LVAD implantation, renal replacement therapy before LVAD implantation, short-term mechanical support before LVAD implantation, INTERMACS class 1 to 2, low intraoperative platelet count, low early postoperative hemoglobin level, low early postoperative platelet count, low early postoperative pH, and massive perioperative blood transfusion. In the multivariate logistic regression analysis, only mechanical ventilation before LVAD implantation was retained as an independent risk factor for ICU mortality (OR = 11.96 [95%CI: 2.67-53.45], P < .01). These findings confirm that most deaths after LVAD implantation occur in the ICU. Patients that receive mechanical ventilation preoperatively have the highest risk of death. This confirms the need to actively treat respiratory failure and to wean patients from respiratory support before LVAD implantation. Such a strategy offers the best opportunity to initiate active rehabilitation.

Published
2019

4. Contributors

Author

Philip Aagaard, Dominic James Abrams, Hugues Abriel, Wayne O. Adkisson, Esperanza Agullo-Pascual, Francisco J. Alvarado, Ahmad S. Amin, Charles Antzelevitch, Justus M.B. Anumonwo, Luciana Armaganijan, Arash Arya, Samuel Asirvatham, Felipe Atienza, Peter H. Backx, Lisa M. Ballou, Elise Balse, Sujata Balulad, Andrea Barbuti, Gust H. Bardy, Guillaume Bassil, David G. Benditt, Omer Berenfeld, Donald M. Bers, Ofer Binah, Frank Bogun, Rossana Bongianino, Noel G. Boyle, Patrick M. Boyle, Günter Breithardt, Marisa Brini, Peter R. Brink, Pedro Brugada, Eric Buch, Feliksas F. Bukauskas, Hugh Calkins, David J. Callans, Sean M. Caples, Ernesto Carafoli, William A. Catterall, Marina Cerrone, Arnaud Chaumeil, Caressa Chen, Lan S. Chen, Peng-Sheng Chen, Jianding Cheng, Nipavan Chiamvimonvat, David J. Christini, Aman Chugh, Andreu M. Climent, Ira S. Cohen, Stuart J. Connolly, Lebron Cooper, Eric M. Crespo, Lia Crotti, Thomas A. Csepe, Frank Cuoco, Anne B. Curtis, Ralph J. Damiano, Dawood Darbar, Mithilesh K. Das, Andre d’Avila, Mario Delmar, Eva Delpón, Marco Denegri, Arnaud Denis, Nicolas Derval, Isabelle Deschênes, Abhishek Deshmukh, Luigi Di Biase, Timm M. Dickfeld, Hans Dierckx, Borislav Dinov, Sanjay Dixit, Dobromir Dobrev, Remi Dubois, Lars Eckardt, Andrew G. Edwards, Kenneth A. Ellenbogen, Patrick T. Ellinor, N.A. Mark Estes, Larissa Fabritz, Vadim V. Fedorov, Antonio B. Fernandez, Elvis Teijeira Fernández, David Filgueiras-Rama, Michael C. Fishbein, Glenn I. Fishman, David S. Frankel, Paul Friedman, Antonio Frontera, Apoor S. Gami, Paul Garabelli, Alfred L. George, Edward P. Gerstenfeld, Sigfus Gizurarson, Michael R. Gold, Jeffrey J. Goldberger, Andrew Grace, Guido Grassi, Ruth Ann Greenfield, Wendy L. Gross, Blair P. Grubb, María S. Guillem, Sándor Györke, Michel Haïssaguerre, Johan Hake, Henry R. Halperin, Brian J. Hansen, Stéphane Hatem, David L. Hayes, Jordi Heijman, Todd J. Herron, Gerhard Hindricks, Mélèze Hocini, Stefan H. Hohnloser, David R. Holmes, Masahiko Hoshijima, Thomas J. Hund, Mathew D. Hutchinson, Leonard Ilkhanoff, Jodie Ingles, James E. Ip, Warren M. Jackman, Nicholas Jackson, Pierre Jaïs, José Jalife, Bong Sook Jhun, Roy M. John, Monique Jongbloed, Luc Jordaens, Jonathan M. Kalman, Timothy J. Kamp, Mohamed H. Kanj, Suraj Kapa, Beverly Karabin, Ioannis Karakikes, Demosthenes G. Katritsis, Kuljeet Kaur, Paulus Kirchhof, André G. Kléber, George J. Klein, Peter Kohl, Jayanthi N. Koneru, Jacob S. Koruth, Andrew D. Krahn, Trine Krogh-Madsen, Karl Heinz Kuck, Saurabh Kumar, Alexander Kushnir, Neal K. Lakdawala, Zachary W.M. Laksman, Rakesh Latchamsetty, Dennis H. Lau, Bruce B. Lerman, Richard Z. Lin, Shien-Fong Lin, Mark S. Link, Bin Liu, Christopher F. Liu, Deborah J. Lockwood, Anatoli N. Lopatin, Steven A. Lubitz, Rajiv Mahajan, Jonathan C. Makielski, Marek Malik, Francis E. Marchlinski, Steven M. Markowitz, Barry J. Maron, Martin S. Maron, Steven O. Marx, Stéphane Massé, Andrew D. McCulloch, Pippa McKelvie-Sebileau, Spencer J. Melby, Andreas Metzner, Anushka P. Michailova, Gregory F. Michaud, John M. Miller, Jyotsna Mishra, Raul D. Mitrani, Peter J. Mohler, Fred Morady, Robert J. Myerburg, Hiroshi Nakagawa, Chrishan Joseph Nalliah, Kumaraswamy Nanthakumar, Carlo Napolitano, Sanjiv M. Narayan, Andrea Natale, Stanley Nattel, Saman Nazarian, Thao P. Nguyen, Akihiko Nogami, Sami F. Noujaim, Karine Nubret Le Coniat, Brian Olshansky, Jin O-Uchi, Gavin Y. Oudit, Feifan Ouyang, Cevher Ozcan, Douglas L. Packer, Sandeep V. Pandit, Alexander V. Panfilov, David S. Park, Bence Patocskai, Dainius H. Pauza, Neringa Pauziene, Jonathan P. Piccini, Geoffrey S. Pitt, Sunny S. Po, Abhiram Prasad, Silvia G. Priori, Przemysław B. Radwański, Wouter-Jan Rappel, Michelle Reiser, Alejandro Jimenez Restrepo, Richard B. Robinson, Dan M. Roden, Michael R. Rosen, Raphael Rosso, Yoram Rudy, Kristina Rysevaite-Kyguoliene, Hani N. Sabbah, Frederic Sacher, Frank B. Sachse, Ardan M. Saguner, Prashanthan Sanders, Michael C. Sanguinetti, Pasquale Santangeli, Mohammad Sarraf, Jonathan Satin, Martin Jan Schalij, Benjamin J. Scherlag, Matthew R. Schill, J. William Schleifer, Richard B. Schuessler, Peter J. Schwartz, Timon Seeger, Christopher Semsarian, Gino Seravalle, Ashok J. Shah, Robin M. Shaw, Mark J. Shen, Win–Kuang Shen, Shey-Shing Sheu, Kalyanam Shivkumar, Jennifer N.A. Silva, Allan C. Skanes, Kyoko Soejima, Virend K. Somers, Dan Sorajja, Stavros Stavrakis, Christian Steinberg, Lynne Warner Stevenson, William G. Stevenson, Michael O. Sweeney, Charles Swerdlow, Masateru Takigawa, Juan Tamargo, Harikrishna Tandri, Usha B. Tedrow, Nathaniel Thompson, Paul D. Thompson, Gordon F. Tomaselli, Jeffrey A. Towbin, Natalia A. Trayanova, Martin Tristani-Firouzi, Zian H. Tseng, Akiko Ueda, Héctor H. Valdivia, Virginijus Valiunas, Christian van der Werf, George F. Van Hare, David Vidmar, Sami Viskin, Niels Voigt, Edward P. Walsh, Paul J. Wang, Xander H.T. Wehrens, Mark S. Weiss, Arthur A.M. Wilde, Bruce L. Wilkoff, Y. Joseph Woo, Joseph C. Wu, Raymond Yee, Junaid A.B. Zaman, Manuel Zarzoso, Emily P. Zeitler, Katja Zeppenfeld, Tarek Zghaib, Xiao-Dong Zhang, and Douglas P. Zipes

Published
2018
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