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Krishnan A, Ruaengsri C, Guenthart BA, Shudo Y, Wang H, Ma MR, MacArthur JW, Hiesinger W, Woo YJ. Beating Heart Transplant Procedures Using Organs From Donors With Circulatory Death. JAMA Netw Open 2024; 7:e241828. [PMID: 38466306 DOI: 10.1001/jamanetworkopen.2024.1828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/12/2024] Open
Abstract
Importance The use of ex vivo normothermic organ perfusion has enabled the use of deceased after circulatory death (DCD) donors for heart transplants. However, compared with conventional brain death donation, DCD heart transplantation performed with ex vivo organ perfusion involves an additional period of warm and cold ischemia, exposing the allograft to multiple bouts of ischemia reperfusion injury and may contribute to the high rates of extracorporeal membrane oxygenation usage after DCD heart transplantation. Objective To assess whether the beating heart method of DCD heart transplantation is safe and whether it has an acceptable rate of extracorporeal membrane oxygenation use postoperatively. Design, Setting, and Participants This case series includes 10 patients with end-stage heart failure undergoing DCD heart transplantation at a single academic medical center from October 1, 2022, to August 3, 2023. Data were analyzed from October 2022 to August 2023. Interventions Using a beating heart method of implantation of the donor allograft. Main Outcomes and Measures The main outcome was primary graft dysfunction necessitating postoperative initiation of mechanical circulatory support. Survival and initiation of mechanical circulatory support were secondary outcomes. Results In this case series, 10 consecutive patients underwent DCD heart transplantation via the beating heart method. Ten of 10 recipients were male (100%), the mean (SD) age was 51.2 (13.8) years, and 7 (70%) had idiopathic dilated cardiomyopathy. Ten patients (100%) survived, and 0 patients had initiation of extracorporeal membrane oxygenation postoperatively. No other mechanical circulatory support, including intra-aortic balloon pump, was initiated postoperatively. Graft survival was 100% (10 of 10 patients), and, at the time of publication, no patients have been listed for retransplantation. Conclusions and Relevance In this study of 10 patients undergoing heart transplantation, the beating heart implantation method for DCD heart transplantation was safe and may mitigate ischemia reperfusion injury, which may lead to lower rates of primary graft dysfunction necessitating extracorporeal membrane oxygenation. These results are relevant to institutions using DCD donors for heart transplantation.
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Affiliation(s)
- Aravind Krishnan
- Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, California
| | - Chawannuch Ruaengsri
- Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, California
| | - Brandon A Guenthart
- Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, California
| | - Yasuhiro Shudo
- Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, California
| | - Hanjay Wang
- Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, California
| | - Michael R Ma
- Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, California
| | - John Ward MacArthur
- Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, California
| | - William Hiesinger
- Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, California
| | - Y Joseph Woo
- Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, California
- Department of Bioengineering, Stanford University School of Engineering, Stanford, California
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Jou S, Mendez SR, Feinman J, Mitrani LR, Fuster V, Mangiola M, Moazami N, Gidea C. Heart transplantation: advances in expanding the donor pool and xenotransplantation. Nat Rev Cardiol 2024; 21:25-36. [PMID: 37452122 DOI: 10.1038/s41569-023-00902-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/13/2023] [Indexed: 07/18/2023]
Abstract
Approximately 65 million adults globally have heart failure, and the prevalence is expected to increase substantially with ageing populations. Despite advances in pharmacological and device therapy of heart failure, long-term morbidity and mortality remain high. Many patients progress to advanced heart failure and develop persistently severe symptoms. Heart transplantation remains the gold-standard therapy to improve the quality of life, functional status and survival of these patients. However, there is a large imbalance between the supply of organs and the demand for heart transplants. Therefore, expanding the donor pool is essential to reduce mortality while on the waiting list and improve clinical outcomes in this patient population. A shift has occurred to consider the use of organs from donors with hepatitis C virus, HIV or SARS-CoV-2 infection. Other advances in this field have also expanded the donor pool, including opt-out donation policies, organ donation after circulatory death and xenotransplantation. We provide a comprehensive overview of these various novel strategies, provide objective data on their safety and efficacy, and discuss some of the unresolved issues and controversies of each approach.
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Affiliation(s)
- Stephanie Jou
- The Zena and Michael A. Wiener Cardiovascular Institute, The Mount Sinai Hospital, New York, NY, USA.
| | - Sean R Mendez
- The Zena and Michael A. Wiener Cardiovascular Institute, The Mount Sinai Hospital, New York, NY, USA
| | - Jason Feinman
- The Zena and Michael A. Wiener Cardiovascular Institute, The Mount Sinai Hospital, New York, NY, USA
| | - Lindsey R Mitrani
- The Zena and Michael A. Wiener Cardiovascular Institute, The Mount Sinai Hospital, New York, NY, USA
| | - Valentin Fuster
- The Zena and Michael A. Wiener Cardiovascular Institute, The Mount Sinai Hospital, New York, NY, USA
| | - Massimo Mangiola
- Transplant Institute, New York University Langone Health, New York, NY, USA
| | - Nader Moazami
- Department of Cardiothoracic Surgery, New York University Langone Health, New York, NY, USA
| | - Claudia Gidea
- The Zena and Michael A. Wiener Cardiovascular Institute, The Mount Sinai Hospital, New York, NY, USA
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3
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Kounatidis D, Brozou V, Anagnostopoulos D, Pantos C, Lourbopoulos A, Mourouzis I. Donor Heart Preservation: Current Knowledge and the New Era of Machine Perfusion. Int J Mol Sci 2023; 24:16693. [PMID: 38069017 PMCID: PMC10706714 DOI: 10.3390/ijms242316693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 11/17/2023] [Accepted: 11/21/2023] [Indexed: 12/18/2023] Open
Abstract
Heart transplantation remains the conventional treatment in end-stage heart failure, with static cold storage (SCS) being the standard technique used for donor preservation. Nevertheless, prolonged cold ischemic storage is associated with the increased risk of early graft dysfunction attributed to residual ischemia, reperfusion, and rewarming damage. In addition, the demand for the use of marginal grafts requires the development of new methods for organ preservation and repair. In this review, we focus on current knowledge and novel methods of donor preservation in heart transplantation. Hypothermic or normothermic machine perfusion may be a promising novel method of donor preservation based on the administration of cardioprotective agents. Machine perfusion seems to be comparable to cold cardioplegia regarding donor preservation and allows potential repair treatments to be employed and the assessment of graft function before implantation. It is also a promising platform for using marginal organs and increasing donor pool. New pharmacological cardiac repair treatments, as well as cardioprotective interventions have emerged and could allow for the optimization of this modality, making it more practical and cost-effective for the real world of transplantation. Recently, the use of triiodothyronine during normothermic perfusion has shown a favorable profile on cardiac function and microvascular dysfunction, likely by suppressing pro-apoptotic signaling and increasing the expression of cardioprotective molecules.
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Affiliation(s)
| | | | | | | | | | - Iordanis Mourouzis
- Department of Pharmacology, National and Kapodistrian University of Athens, 11527 Athens, Greece; (D.K.); (V.B.); (D.A.); (C.P.); (A.L.)
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4
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Mandoli GE, Barilli M, Soviero D, Ghionzoli N, Landra F, Maccherini M, Bernazzali S, Natali BM, Focardi M, Cavigli L, D’Ascenzi F, Pastore MC, Sciaccaluga C, Bombardini T, Valente S, Cameli M. ADONHERS (Aged DONor HEart Rescue by Stress Echo) National Protocol: Recipient's Survival after 10-Year Follow-Up. J Clin Med 2023; 12:3505. [PMID: 37240611 PMCID: PMC10218963 DOI: 10.3390/jcm12103505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Revised: 04/15/2023] [Accepted: 04/16/2023] [Indexed: 05/28/2023] Open
Abstract
Background: The gold-standard treatment for end-stage heart failure is heart transplantation, but the lack of organ donors remains an important limitation in this field. An accurate selection of marginal hearts is fundamental to increase organ availability. Purpose: In our study we analyzed if recipients receiving marginal donor (MD) hearts, selected by dipyridamole stress echocardiography according to the ADOHERS national protocol, had different outcomes compared to recipients with acceptable donor (AD) hearts. Methods: Data were collected and retrospectively analyzed from patients who received an orthotopic heart transplant at our institution between 2006 and 2014. Dipyridamole stress echo was performed on identified marginal donors and selected hearts were eventually transplanted. Clinical, laboratory and instrumental features of the recipients were evaluated and patients with homogenous baseline characteristics were selected. Results: Eleven recipients transplanted with a selected marginal heart and eleven recipients transplanted with an acceptable heart were included. Mean donor age was 41 ± 23. The median follow-up was 113 months (IQR 86-146 months). Age, cardiovascular risk and morpho-functional characteristics of the left ventricle were comparable between the two populations (p > 0.05). Left atrial size was significantly higher in patients with marginal hearts (acceptable atrial volume: 23 ± 5 mL; marginal atrial volume: 38 ± 5 mL; p = 0.003). Acceptable donor recipients showed a higher impact of Cardiac Allograph Vasculopathy (p = 0.019). No rejection differences were found between the two groups. Four patients deceased, three were standard donor recipients and one was from the marginal donor group. Conclusions: Our study shows how cardiac transplant (Htx) from selected marginal donor hearts through a non-invasive bedside technique can alleviate the shortage of organs without a difference in survival compared to acceptable donor hearts.
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Affiliation(s)
- Giulia Elena Mandoli
- Department of Medical Biotechnologies, Division of Cardiology, University of Siena, Policlinico “Le Scotte”, 53100 Siena, Italy
| | - Maria Barilli
- Department of Medical Biotechnologies, Division of Cardiology, University of Siena, Policlinico “Le Scotte”, 53100 Siena, Italy
| | - Davide Soviero
- Department of Medical Biotechnologies, Division of Cardiology, University of Siena, Policlinico “Le Scotte”, 53100 Siena, Italy
| | - Nicolò Ghionzoli
- Department of Medical Biotechnologies, Division of Cardiology, University of Siena, Policlinico “Le Scotte”, 53100 Siena, Italy
| | - Federico Landra
- Department of Medical Biotechnologies, Division of Cardiology, University of Siena, Policlinico “Le Scotte”, 53100 Siena, Italy
| | - Massimo Maccherini
- Cardio-Thoracic and Vascular Department, Cardiac Surgery Unit, University of Siena, Policlinico “Le Scotte”, 53100 Siena, Italy
| | - Sonia Bernazzali
- Cardio-Thoracic and Vascular Department, Cardiac Surgery Unit, University of Siena, Policlinico “Le Scotte”, 53100 Siena, Italy
| | - Benedetta Maria Natali
- Department of Medical Biotechnologies, Division of Cardiology, University of Siena, Policlinico “Le Scotte”, 53100 Siena, Italy
| | - Marta Focardi
- Department of Medical Biotechnologies, Division of Cardiology, University of Siena, Policlinico “Le Scotte”, 53100 Siena, Italy
| | - Luna Cavigli
- Department of Medical Biotechnologies, Division of Cardiology, University of Siena, Policlinico “Le Scotte”, 53100 Siena, Italy
| | - Flavio D’Ascenzi
- Department of Medical Biotechnologies, Division of Cardiology, University of Siena, Policlinico “Le Scotte”, 53100 Siena, Italy
| | - Maria Concetta Pastore
- Department of Medical Biotechnologies, Division of Cardiology, University of Siena, Policlinico “Le Scotte”, 53100 Siena, Italy
| | - Carlotta Sciaccaluga
- Department of Medical Biotechnologies, Division of Cardiology, University of Siena, Policlinico “Le Scotte”, 53100 Siena, Italy
| | - Tonino Bombardini
- Institute of Clinical Physiology, National Research Council, 56124 Pisa, Italy;
| | - Serafina Valente
- Department of Medical Biotechnologies, Division of Cardiology, University of Siena, Policlinico “Le Scotte”, 53100 Siena, Italy
| | - Matteo Cameli
- Department of Medical Biotechnologies, Division of Cardiology, University of Siena, Policlinico “Le Scotte”, 53100 Siena, Italy
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5
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Neto D, Guenthart B, Shudo Y, Currie ME. World's first en bloc heart-lung transplantation using the paragonix lungguard donor preservation system. J Cardiothorac Surg 2023; 18:131. [PMID: 37041582 PMCID: PMC10091844 DOI: 10.1186/s13019-023-02281-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Accepted: 04/06/2023] [Indexed: 04/13/2023] Open
Abstract
We present the first en bloc heart-lung donor transplant procurement using the Paragonix LUNGguard™ donor preservation system. This system offers reliable static hypothermic conditions designed to prevent major complications such as cold ischemic injury, uneven cooling and physical damage. While this represents a single case, the encouraging results warrant further investigation.
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Affiliation(s)
- Daniel Neto
- Department of Cardiothoracic Surgery, Center for Academic Medicine, Stanford University School of Medicine, 453 Quarry Road, Stanford, CA, 94305, USA
| | - Brandon Guenthart
- Department of Cardiothoracic Surgery, Center for Academic Medicine, Stanford University School of Medicine, 453 Quarry Road, Stanford, CA, 94305, USA
| | - Yasuhiro Shudo
- Department of Cardiothoracic Surgery, Center for Academic Medicine, Stanford University School of Medicine, 453 Quarry Road, Stanford, CA, 94305, USA
| | - Maria E Currie
- Department of Cardiothoracic Surgery, Center for Academic Medicine, Stanford University School of Medicine, 453 Quarry Road, Stanford, CA, 94305, USA.
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6
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Perazzo A, Anderl L, Lima RDC, Wiedemann D, Lorusso R. Venoarterial Extracorporeal Membrane Oxygenation in Cardiogenic Shock to Ventricular Assist Device or Heart Transplantation - Where Are We? Braz J Cardiovasc Surg 2023; 38:I-III. [PMID: 36897819 PMCID: PMC10010728 DOI: 10.21470/1678-9741-2023-0960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2023] Open
Affiliation(s)
- Alvaro Perazzo
- Department of Cardiac Surgery, Pronto-Socorro Cardiológico de Pernambuco (PROCAPE), Universidade de Pernambuco, Recife, Pernambuco, Brazil.,Cardio-Thoracic Surgery Department, Heart and Vascular Center, Maastricht University Medical Center, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands
| | - Lisa Anderl
- Department of Cardiac Surgery, Medical University of Vienna, Vienna, Austria
| | - Ricardo de Carvalho Lima
- Department of Cardiac Surgery, Pronto-Socorro Cardiológico de Pernambuco (PROCAPE), Universidade de Pernambuco, Recife, Pernambuco, Brazil
| | - Dominik Wiedemann
- Department of Cardiac Surgery, Medical University of Vienna, Vienna, Austria
| | - Roberto Lorusso
- Cardio-Thoracic Surgery Department, Heart and Vascular Center, Maastricht University Medical Center, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands
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7
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Yazji JH, Garg P, Wadiwala I, Alomari M, Alamouti-Fard E, Hussain MWA, Jacob S. Expanding Selection Criteria to Repairable Diseased Hearts to Meet the Demand of Shortage of Donors in Heart Transplantation. Cureus 2022; 14:e25485. [PMID: 35663679 PMCID: PMC9150717 DOI: 10.7759/cureus.25485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/29/2022] [Indexed: 11/05/2022] Open
Abstract
Heart transplant surgery is considered the destination therapy for end-stage heart disease. Unfortunately, many patients in the United States of America who are eligible candidates for transplants cannot undergo surgery due to donor shortage. In addition, some donors' hearts are being labeled as unacceptable for transplant surgery because of the rigorous and restricted rules placed on the approval process of using a donor's heart. Over the last few decades, the rising discrepancy between the scarcity of donor hearts and the demand for such organs has led to the discussion of expanding the donor heart selection criteria. A softer view on using marginal hearts for transplants would help those on the waitlist to receive a heart transplant. Marginal hearts that contain the hepatitis c virus (HCV), COVID-19, older age, or repairable heart defects have become viable options to use for a heart transplant. Also, the prioritization based on the new heart allocation system would help efficiently decide which recipients would be the first to get a donor's heart. Recently there has been a consensus to broaden the eligibility of donor's hearts by accepting valvular abnormalities, coronary artery disease, and congenital abnormalities. This review highlights some of those expansions in selection criteria in particular using repairable hearts, which could be fixed in the operating room on the back table before transplantation.
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8
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Donor selection for multiorgan transplantation. Curr Opin Organ Transplant 2022; 27:52-56. [PMID: 34939964 DOI: 10.1097/mot.0000000000000940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE OF REVIEW There is limited data and guidance on donor selection for multiorgan transplantation. In this article, we review the current Organ Procurement and Transplantation Network policy on multiorgan allocation and the ideal donor criteria for each specific organ, in order to provide a framework to guide donor selection for various scenarios of multiorgan transplantation, including heart-kidney, heart-lung, heart-liver and heart-kidney-liver transplant procedures. RECENT FINDINGS Combined heart-kidney transplantation is the most common multiorgan transplant procedure and requires the most stringent HLA matching to ensure optimal graft survival. Using the virtual crossmatch and desensitization therapies can shorten waitlist times without increasing posttransplant rejection or mortality rates. The ideal heart-lung donor tends to be younger than other multiorgan transplants, and more tolerant to HLA mismatch, but ideally requires donors with no prior history of smoking, a short period of time on mechanical ventilation, adequate oxygenation and absence of pulmonary infection. The ideal heart-liver donor is often driven by criteria specific to the donor heart. Finally, several observational studies suggest that livers are more tolerant to HLA mismatch than other organs, and offer some degree of immune protection in combined organ transplants. SUMMARY Multiorgan transplantation is a steadily growing field. The required short ischemic time for the donor heart is often the limiting factor, as well as the scarcity of appropriate donors available within geographical confines. In general, as with single organ transplantation, younger age, size matching, few medical comorbidities and HLA compatibility confer the best posttransplant outcomes.
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9
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Pagani FD. Heart Transplantation Using Organs From Donors Following Circulatory Death: The Journey Continues. J Am Coll Cardiol 2021; 79:163-165. [PMID: 34922743 DOI: 10.1016/j.jacc.2021.11.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 11/09/2021] [Indexed: 01/13/2023]
Affiliation(s)
- Francis D Pagani
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, Michigan, USA.
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10
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Fuery MA, Chouairi F, Natov P, Bhinder J, Rose Chiravuri M, Wilson L, Clark KA, Reinhardt SW, Mullan C, Elliott Miller P, Davis RP, Rogers JG, Patel CB, Sen S, Geirsson A, Anwer M, Desai N, Ahmad T. Trends and Outcomes of Cardiac Transplantation in the Lowest Urgency Candidates. J Am Heart Assoc 2021; 10:e023662. [PMID: 34743559 PMCID: PMC9075266 DOI: 10.1161/jaha.121.023662] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Background Due to discrepancies between donor supply and recipient demand, the cardiac transplantation process aims to prioritize the most medically urgent patients. It remains unknown how recipients with the lowest medical urgency compare to others in the allocation process. We aimed to examine differences in clinical characteristics, organ allocation patterns, and outcomes between cardiac transplantation candidates with the lowest and highest medical urgency. Methods and Results We performed a retrospective analysis of the United Network for Organ Sharing database. Patients listed for cardiac transplantation between January 2011 and May 2020 were stratified according to status at time of transplantation. Baseline recipient and donor characteristics, waitlist survival, and post-transplantation outcomes were compared in the years before and after the 2018 allocation system change. Lower urgency patients in the old system were older (58.5 vs. 56 years) and more likely female (54.4% vs. 23.8%) compared to the highest urgency patients, and these trends persisted in the new system (p<0.001, all). Donors for the lowest urgency patients were more likely older, female, or have a history of CMV, hepatitis C, or diabetes (p<0.01, all). The lowest urgency patients had longer waitlist times, and under the new allocation system received organs from shorter distances with decreased ischemic times (178 vs. 269 miles, 3.1 vs 3.5 hours, p<0,001, all). There was no difference in post-transplantation survival (p<0.01, all). Conclusions Patients transplanted as lower urgency receive hearts from donors with additional comorbidities compared to higher urgency patients, but outcomes are similar at one year.
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Affiliation(s)
- Michael A Fuery
- Department of Internal Medicine Yale School of Medicine New Haven CT
| | - Fouad Chouairi
- Department of Internal Medicine Yale School of Medicine New Haven CT
| | - Peter Natov
- Department of Internal Medicine Yale School of Medicine New Haven CT
| | - Jasjit Bhinder
- Section of Cardiovascular Medicine Yale School of Medicine New Haven CT
| | | | - Lynn Wilson
- Section of Cardiovascular Medicine Yale School of Medicine New Haven CT
| | - Katherine A Clark
- Section of Cardiovascular Medicine Yale School of Medicine New Haven CT
| | | | - Clancy Mullan
- Division of Cardiac Surgery Yale School of Medicine New Haven CT
| | - P Elliott Miller
- Section of Cardiovascular Medicine Yale School of Medicine New Haven CT
| | - Robert P Davis
- Division of Cardiac Surgery Yale School of Medicine New Haven CT
| | | | - Chetan B Patel
- Division of Cardiology Department of Medicine Duke University Durham NC
| | - Sounok Sen
- Section of Cardiovascular Medicine Yale School of Medicine New Haven CT
| | - Arnar Geirsson
- Division of Cardiac Surgery Yale School of Medicine New Haven CT
| | - Muhammad Anwer
- Division of Cardiac Surgery Yale School of Medicine New Haven CT
| | - Nihar Desai
- Section of Cardiovascular Medicine Yale School of Medicine New Haven CT
| | - Tariq Ahmad
- Section of Cardiovascular Medicine Yale School of Medicine New Haven CT
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