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Glazier AK, Dafflisio G, Rajab TK, Kalfa D, Jaggers J, Emani S, Greenwald MA. Why partial heart transplantation could be regulated as organ transplantation. Am J Transplant 2024:S1600-6135(24)00372-1. [PMID: 38876367 DOI: 10.1016/j.ajt.2024.06.003] [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: 03/20/2024] [Revised: 05/30/2024] [Accepted: 06/06/2024] [Indexed: 06/16/2024]
Abstract
Partial heart transplant (PHT) is a recent clinical innovation involving the transplantation of a segment of the heart (valves) directly from the deceased donor into the recipient patient. This procedure holds out the possibility of significant benefit, especially for pediatric patients because these grafts show growth potential after transplant, reducing or eliminating the current need for repeat procedures. The clinical process for donation and transplant of partial heart (PH) grafts generally follows an organ clinical pathway; however, the Food and Drug Administration has recently stated its intent to regulate PH as tissues, raising a host of regulatory considerations. PHT requires donor testing and eligibility determinations within a short, clinically viable timeframe and, similar to organ transplant, involves donor-recipient matching. Waitlist allocation policies that are a regulatory focus of the Organ Procurement and Transplantation Network including equity and efficiency may become relevant. Oversight of PHT by the Organ Procurement and Transplantation Network could be accomplished through interpretation of the vascular composite allograft definition or through designation by the US Department of Health and Human Services of PH grafts as organs. While some clinical questions remain unanswered, it is important to carefully address these regulatory considerations to support the emergence of this innovation and ensure the continued trust of the donating public and the patients who may benefit from PHT.
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Affiliation(s)
- Alexandra K Glazier
- New England Donor Services, Waltham, Massachusetts, USA; Brown University School of Public Health, Providence, Rhode Island, USA.
| | - Gianna Dafflisio
- Department of Cardiac Surgery, Boston Children's Hospital, Boston, Massachusetts, USA
| | - Taufiek Konrad Rajab
- Cardiothoracic Surgery, Arkansas Children's Hospital, Little Rock, Arkansas, USA
| | - David Kalfa
- Section of Pediatric and Congenital Cardiac Surgery, Columbia University Medical Center/NewYork-Presbyterian, New York, New York, USA; Pediatric and Congenital Cardiac Surgery, Weill-Cornell Medical Center/NewYork-Presbyterian, New York, New York, USA
| | - James Jaggers
- Pediatric Cardiac Surgery, Childrens Hospital Colorado, Aurora, Colorado, USA
| | - Sitaram Emani
- Department of Cardiac Surgery, Boston Children's Hospital, Boston, Massachusetts, USA
| | - Melissa A Greenwald
- Donor Alliance, Colorado, USA; Uniformed Services University, Bethesda, Maryland, USA
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2
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Rajab TK, Vogel AD, Alexander VS, Brockbank KGM, Turek JW. The future of partial heart transplantation. J Heart Lung Transplant 2024; 43:863-865. [PMID: 38368912 DOI: 10.1016/j.healun.2024.02.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Revised: 02/12/2024] [Accepted: 02/14/2024] [Indexed: 02/20/2024] Open
Abstract
Heart valve replacement in children is an unsolved problem in congenital cardiac surgery because state-of-the-art heart valve implants do not grow. This leads to serial repeat operations to replace outgrown heart valve implants. Partial heart transplantation is a new transplant that helps alleviate this problem by delivering growing heart valve implants. In the future, partial heart transplantation has the potential to complement conventional heart transplantation for treating children with congenital cardiac disease primarily affecting the heart valves.
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Affiliation(s)
- Taufiek K Rajab
- Department of Cardiovascular Surgery, Arkansas Children's Hospital, Little Rock, Arkansas; Department of Cardiovascular Surgery, Arkansas Children's Hospital, Little Rock, Arkansas.
| | - Andrew D Vogel
- Department of Cardiovascular Surgery, Arkansas Children's Hospital, Little Rock, Arkansas; Division of Research, Alabama College of Osteopathic Medicine, Dothan, Alabama
| | - Vincent S Alexander
- Department of Cardiovascular Surgery, Arkansas Children's Hospital, Little Rock, Arkansas; Division of Research, Alabama College of Osteopathic Medicine, Dothan, Alabama
| | | | - Joseph W Turek
- Division of Cardiovascular and Thoracic Surgery, Department of Surgery, Duke University Medical Center, Durham, North Carolina
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3
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Kalfa D, Rajab TK, Cordoves E, Emani S, Bacha E, Jaggers J, Goldstone A, Eghtesady P, Turek J. Living allogenic heart valve transplantation: Relative advantages and unanswered questions. J Thorac Cardiovasc Surg 2024; 167:1543-1546. [PMID: 37743011 DOI: 10.1016/j.jtcvs.2023.09.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Accepted: 09/11/2023] [Indexed: 09/26/2023]
Affiliation(s)
- David Kalfa
- Section of Pediatric and Congenital Cardiac Surgery, Division of Cardiac, Thoracic, and Vascular Surgery, Columbia University Medical Center, New York-Presbyterian Morgan Stanley Children's Hospital, New York, NY.
| | - Taufiek K Rajab
- Section of Pediatric Cardiothoracic Surgery, Medical University of South Carolina Shawn Jenkin's Children's Hospital, Charleston, SC
| | - Elizabeth Cordoves
- Vagelos College of Physicians and Surgeons, Columbia University, New York, NY
| | - Sitaram Emani
- Department of Cardiovascular Surgery, Boston Children's Hospital, Boston, Mass
| | - Emile Bacha
- Section of Pediatric and Congenital Cardiac Surgery, Division of Cardiac, Thoracic, and Vascular Surgery, Columbia University Medical Center, New York-Presbyterian Morgan Stanley Children's Hospital, New York, NY
| | - James Jaggers
- Section of Congenital Heart Surgery, Children's Hospital Colorado, University of Colorado, Aurora, Colo
| | - Andrew Goldstone
- Section of Pediatric and Congenital Cardiac Surgery, Division of Cardiac, Thoracic, and Vascular Surgery, Columbia University Medical Center, New York-Presbyterian Morgan Stanley Children's Hospital, New York, NY
| | - Pirooz Eghtesady
- Section of Pediatric Cardiothoracic Surgery, Washington University School of Medicine, St Louis, Mo
| | - Joseph Turek
- Division of Thoracic and Cardiovascular Surgery, Duke Children's Pediatric and Congenital Heart Center, Duke University, Duke Children's Hospital, Durham, NC
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Rajab TK. Partial heart transplantation: Growing heart valve implants for children. Artif Organs 2024; 48:326-335. [PMID: 37849378 PMCID: PMC10960715 DOI: 10.1111/aor.14664] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Revised: 09/11/2023] [Accepted: 10/02/2023] [Indexed: 10/19/2023]
Abstract
Heart valves serve a vital hemodynamic function to ensure unidirectional blood flow. Additionally, native heart valves serve biological functions such as growth and self-repair. Heart valve implants mimic the hemodynamic function of native heart valves, but are unable to fulfill their biological functions. We developed partial heart transplantation to deliver heart valve implants that fulfill all functions of native heart valves. This is particularly advantageous for children, who require growing heart valve implants. This invited review outlines the past, present and future of partial heart transplantation.
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Affiliation(s)
- Taufiek Konrad Rajab
- Division of Pediatric Cardiovascular Surgery, Arkansas Children's Hospital, Little Rock, Arkansas, USA
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5
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Overbey DM, Rajab TK, Turek JW. Partial Heart Transplantation - How to Change the System. Semin Thorac Cardiovasc Surg Pediatr Card Surg Annu 2024; 27:100-105. [PMID: 38522865 DOI: 10.1053/j.pcsu.2024.01.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 01/03/2024] [Accepted: 01/12/2024] [Indexed: 03/26/2024]
Abstract
Partial heart transplantation is the first clinically successful approach to deliver growing heart valve implants. To date, 13 clinical partial heart transplants have been performed. However, turning partial heart transplantation into a routine procedure that is available to all children who would benefit from growing heart valve implants poses formidable logistical challenges. Firstly, a supply for partial heart transplant donor grafts needs to be developed. This challenge is complicated by the scarcity of donor organs. Importantly, the donor pools for orthotopic heart transplants, partial heart transplants and cadaver homografts overlap. Secondly, partial heart transplants need to be allocated. Factors relevant for equitable allocation include the indication, anatomical fit, recipient clinical status and time on the wait list. Finally, partial heart transplantation will require regulation and oversight, which only recently has been undertaken by the Food and Drug Administration, which regulates human cellular and tissue-based products. Overcoming these challenges will require a change in the system. Once this is achieved, partial heart transplantation could open new horizons for children who require growing tissue implants.
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Affiliation(s)
- Douglas M Overbey
- Congenital Heart Surgery Research and Training Laboratory, Duke University, Durham, North Carolina.; Division of Cardiovascular and Thoracic Surgery, Department of Surgery, Duke University Medical Center, Durham, North Carolina
| | - Taufiek K Rajab
- Medical University of South Carolina, Charleston, South Carolina.; Division of Cardiovascular and Thoracic Surgery, Department of Surgery, Duke University Medical Center, Durham, North Carolina
| | - Joseph W Turek
- Congenital Heart Surgery Research and Training Laboratory, Duke University, Durham, North Carolina.; Division of Cardiovascular and Thoracic Surgery, Department of Surgery, Duke University Medical Center, Durham, North Carolina..
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Kwon JH, Atteya M, Mitta A, Vogel AD, Norris RA, Rajab TK. Ischemia-Reperfusion Injury in Porcine Aortic Valvular Endothelial and Interstitial Cells. J Cardiovasc Dev Dis 2023; 10:436. [PMID: 37887883 PMCID: PMC10607149 DOI: 10.3390/jcdd10100436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 10/11/2023] [Accepted: 10/18/2023] [Indexed: 10/28/2023] Open
Abstract
Ischemia-reperfusion injury (IRI) in the myocardium has been thoroughly researched, especially in acute coronary syndrome and heart transplantation. However, our understanding of IRI implications on cardiac valves is still developing. This knowledge gap becomes even more pronounced given the advent of partial heart transplantation, a procedure designed to implant isolated human heart valves in young patients. This study aims to investigate the effects of IRI on aortic valvular endothelial cells (VECs), valvular interstitial cells (VICs), and whole leaflet cultures (no separation of VECs and VICs). We employed two conditions: hypoxic cold storage reperfusion (HCSR) and normothermia (NT). Key markers, secreted protein acidic and cysteine rich (SPARC) (osteonectin), and inducible nitric oxide synthase (iNOS2) were evaluated. In the isolated cells under HCSR, VICs manifested a significant 15-fold elevation in SPARC expression compared to NT (p = 0.0016). Conversely, whole leaflet cultures exhibited a 1-fold increment in SPARC expression in NT over HCSR (p = 0.0011). iNOS2 expression in VECs presented a marginal rise in HCSR, whereas, in whole leaflet settings, there was a 1-fold ascent in NT compared to HCSR (p = 0.0003). Minor escalations in the adhesion molecules intercellular adhesion molecule (ICAM), vascular cell adhesion molecule (VCAM), E-selection, and P-selection were detected in HCSR for whole leaflet cultures, albeit without statistical significance. Additionally, under HCSR, VICs released a markedly higher quantity of IL-6 and IL-8, with respective p-values of 0.0033 and <0.0001. Interestingly, the IL-6 levels in VECs remained consistent across both HCSR and NT conditions. These insights lay the groundwork for understanding graft IRI following partial heart transplantation and hint at the interdependent dynamic of VECs and VICs in valvular tissue.
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Affiliation(s)
- Jennie H. Kwon
- Department of Surgery, Medical University of South Carolina, Charleston, SC 29425, USA; (J.H.K.); (M.A.)
- Department of Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA;
| | - Miriam Atteya
- Department of Surgery, Medical University of South Carolina, Charleston, SC 29425, USA; (J.H.K.); (M.A.)
| | - Alekhya Mitta
- School of Medicine, University of South Carolina, Columbia, SC 29208, USA;
| | - Andrew D. Vogel
- Division of Research, Alabama College of Osteopathic Medicine, Dothan, AL 36303, USA;
| | - Russell A. Norris
- Department of Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA;
| | - Taufiek Konrad Rajab
- Division of Pediatric Cardiovascular Surgery, Arkansas Children’s Hospital, Little Rock, AR 72202, USA
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Quintao R, Kwon JH, Bishara K, Rajab TK. Donor supply for partial heart transplantation in the United States. Clin Transplant 2023; 37:e15060. [PMID: 37354124 DOI: 10.1111/ctr.15060] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 05/24/2023] [Accepted: 06/13/2023] [Indexed: 06/26/2023]
Abstract
BACKGROUND Congenital heart disease (CHD) is the most common cause of birth defects worldwide. Valvular defects are a common form of CHDs, and, at this time, treatment options for children with unrepairable valve disease are limited. Issues with anticoagulation, sizing, and lack of growth in valve replacement options can lead to high mortality rates and incidence of reoperations. Partial heart transplantation, or transplantation of fresh valve allografts, has recently been described as a strategy to provide a durable and non-thrombogenic alternative to conventional prostheses and provide growth potential in pediatric patients. METHODS The United Network for Organ Sharing (UNOS) database was queried to analyze the number of pediatric donor hearts that were not recovered but had viable valves (n = 3565) between January 2010 and September 2021. Recoverable valves were grouped by donor age: infants (age < 1 year), toddlers (age ≥1 and <3 years), and children (age ≥3 and <18 years). Demographic characteristics of donors were analyzed between age groups. RESULTS Infants, toddlers, and children had a total of 344, 465, and 2756 hearts with recoverable valves, respectively, over the study period, representing an average of 29, 39, and 230 hearts with recoverable valves per year. CONCLUSION The results of our study identify the minimum donor supply for partial heart transplantation. The actual number is likely higher because it includes hearts not entered in the UNOS database and domino transplants from orthotopic heart transplant recipients. Partial heart transplantation is logistically feasible as there are recoverable valves available for all age groups, fulfilling a clinical need in pediatric patients with unrepairable valve disease.
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Affiliation(s)
- Ritchelli Quintao
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Jennie H Kwon
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Katherine Bishara
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Taufiek Konrad Rajab
- Department of Surgery, Medical University of South Carolina, Charleston, South Carolina, USA
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Nguyen SN, Schiazza A, Richmond ME, Zuckerman WA, Bacha EA, Goldstone AB. Trends in pediatric donor heart discard rates and the potential use of unallocated hearts for allogeneic valve transplantation. JTCVS OPEN 2023; 15:374-381. [PMID: 37808067 PMCID: PMC10556831 DOI: 10.1016/j.xjon.2023.06.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 05/30/2023] [Accepted: 05/31/2023] [Indexed: 10/10/2023]
Abstract
Objectives Allogeneic valve transplantation is an emerging therapy that delivers a living valve from a donor heart. We reviewed the national discard rate of pediatric and young adult (aged 25 years or younger) donor grafts to estimate the number of hearts potentially available to source valve allotransplantation. Methods We queried the United Network for Organ Sharing database to identify pediatric and young adult heart donors from 1987 to 2022. Donor heart discard was defined as nontransplantation of the allograft. Results Of 72,460 pediatric/young adult heart donations, 41,065 (56.7%) were transplanted and 31,395 (43.3%) were unutilized. The average annual number of discarded hearts in era 1 (1987-2000), era 2 (2000-2010), and era 3 (2010-2022) was 791 (42.8%), 1035 (46.3%), and 843 (41.2%), respectively. From 2017 to 2021, the average annual number of discards by age was: 39 (31.8%) neonates/infants, 78 (38.0%) toddlers, 41 (49.4%) young children, 240 (38.0%) adolescents, and 498 (40.1%) young adults. High-volume procurement regions had the greatest proportion of nonutilization, with the national average discard rate ranging from 39% to 49%. The most frequently documented reasons for nonallocation were distribution to the heart valve industry (26.5%), presumably due to suboptimal graft function, poor organ function (22.7%), and logistical challenges (10.8%). Conclusions With ∼900 pediatric/young adult donor hearts discarded annually, unutilized grafts represent a potential source of valves for allogeneic valve transplant to supplement current conduit and valve replacement surgery. The limited availability of neonatal and infant hearts may limit this technique in the youngest patients, for whom cryopreserved homografts or xenografts will likely remain the primary valve substitute.
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Affiliation(s)
- Stephanie N. Nguyen
- Section of Pediatric and Congenital Cardiac Surgery, Columbia University Irving Medical Center, New York Presbyterian-Morgan Stanley Children's Hospital, New York, NY
| | - Alexis Schiazza
- Section of Pediatric and Congenital Cardiac Surgery, Columbia University Irving Medical Center, New York Presbyterian-Morgan Stanley Children's Hospital, New York, NY
| | - Marc E. Richmond
- Department of Pediatric Cardiology, Columbia University Irving Medical Center, New York Presbyterian-Morgan Stanley Children's Hospital, New York, NY
| | - Warren A. Zuckerman
- Department of Pediatric Cardiology, Columbia University Irving Medical Center, New York Presbyterian-Morgan Stanley Children's Hospital, New York, NY
| | - Emile A. Bacha
- Section of Pediatric and Congenital Cardiac Surgery, Columbia University Irving Medical Center, New York Presbyterian-Morgan Stanley Children's Hospital, New York, NY
| | - Andrew B. Goldstone
- Section of Pediatric and Congenital Cardiac Surgery, Columbia University Irving Medical Center, New York Presbyterian-Morgan Stanley Children's Hospital, New York, NY
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Konsek H, Sherard C, Bisbee C, Kang L, Turek JW, Rajab TK. Growing Heart Valve Implants for Children. J Cardiovasc Dev Dis 2023; 10:jcdd10040148. [PMID: 37103027 PMCID: PMC10143004 DOI: 10.3390/jcdd10040148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 03/28/2023] [Accepted: 03/29/2023] [Indexed: 04/03/2023] Open
Abstract
The current standard of care for pediatric patients with unrepairable congenital valvular disease is a heart valve implant. However, current heart valve implants are unable to accommodate the somatic growth of the recipient, preventing long-term clinical success in these patients. Therefore, there is an urgent need for a growing heart valve implant for children. This article reviews recent studies investigating tissue-engineered heart valves and partial heart transplantation as potential growing heart valve implants in large animal and clinical translational research. In vitro and in situ designs of tissue engineered heart valves are discussed, as well as the barriers to clinical translation.
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Sherard C, Bisbee C, Konsek H, Kang L, Turek JW, Rajab TK. Partial Heart Transplantation in Adult Cardiac Surgery. INNOVATIONS-TECHNOLOGY AND TECHNIQUES IN CARDIOTHORACIC AND VASCULAR SURGERY 2023; 18:126-131. [PMID: 36872577 DOI: 10.1177/15569845231156921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
Abstract
Many young adults require heart valve replacements. Current options for valve replacement in adults include mechanical valves, bioprosthetic valves, or the Ross procedure. Of these, mechanical and bioprosthetic valves are the most common options, although mechanical valve usage predominates in younger adults due to durability, while bioprosthetic valve usage predominates in older adults. Partial heart transplantation is a new method of valvular replacement that can deliver durable and self-repairing valves and allow adult patients freedom from anticoagulation therapy. This procedure involves transplantation of donor heart valves only, permitting expanded utilization of donor hearts as compared with orthotopic heart transplantation. In this review, we discuss the potential benefits of this procedure in adults who elect against the anticoagulation regimen required of mechanical valve replacements, although it has not yet been clinically established. Partial heart transplantation is a promising new therapy for the treatment of pediatric valvular dysfunction. This is a novel technique in the adult population with potential utility for valve replacement in young patients for whom anticoagulation therapy is problematic, such as women who wish to become pregnant, patients with bleeding disorders, and patients with active lifestyles.
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Affiliation(s)
- Curry Sherard
- College of Medicine, Medical University of South Carolina, Charleston, SC, USA
| | - Cora Bisbee
- College of Medicine, Medical University of South Carolina, Charleston, SC, USA
| | - Haley Konsek
- College of Medicine, Medical University of South Carolina, Charleston, SC, USA
| | - Lillian Kang
- Department of Surgery, Duke University Medical Center, Durham, NC, USA
| | - Joseph W Turek
- Division of Cardiovascular and Thoracic Surgery, Department of Surgery, Duke University Medical Center, Durham, NC, USA
| | - Taufiek K Rajab
- Section of Pediatric Cardiothoracic Surgery, Department of Surgery, Medical University of South Carolina, Charleston, SC, USA
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Sherard C, Atteya M, Vogel AD, Bisbee C, Kang L, Turek JW, Rajab TK. Partial heart transplantation can ameliorate donor organ utilization. J Card Surg 2022; 37:5307-5312. [PMID: 36259737 DOI: 10.1111/jocs.17050] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 09/23/2022] [Accepted: 10/05/2022] [Indexed: 01/06/2023]
Abstract
BACKGROUND The treatment of babies with unrepairable heart valve dysfunction remains an unsolved problem because there are no growing heart valve implants. However, orthotopic heart transplants are known to grow with recipients. AIM Partial heart transplantation is a new approach to delivering growing heart valve implants, which involves transplantation of the part of the heart containing the valves only. In this review, we discuss the benefits of this procedure in children with unrepairable valve dysfunction. CONCLUSION Partial heart transplantation can be performed using donor hearts with poor ventricular function and slow progression to donation after cardiac death. This should ameliorate donor heart utilization and avoid both primary orthotopic heart transplantation in children with unrepairable heart valve dysfunction and progression of these children to end-stage heart failure.
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Affiliation(s)
- Curry Sherard
- Department of Surgery, College of Medicine, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Miriam Atteya
- Department of Surgery, College of Medicine, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Andrew D Vogel
- Department of Surgery, Alabama College of Osteopathic Medicine, Dothan, Alabama, USA
| | - Cora Bisbee
- Department of Surgery, College of Medicine, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Lillian Kang
- Department of Surgery, Duke University Medical Center, Durham, North Carolina, USA
| | - Joseph W Turek
- Division of Cardiovascular and Thoracic Surgery, Department of Surgery, Duke University Medical Center, Durham, North Carolina, USA
| | - Taufiek K Rajab
- Section of Pediatric Cardiothoracic Surgery, Department of Surgery, Medical University of South Carolina, Charleston, South Carolina, USA
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12
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Kwon JH, Hill M, Gerry B, Kubalak SW, Mohiuddin M, Kavarana MN, Rajab TK. Surgical techniques for aortic valve xenotransplantation. J Cardiothorac Surg 2021; 16:358. [PMID: 34961532 PMCID: PMC8714421 DOI: 10.1186/s13019-021-01743-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 10/31/2021] [Indexed: 12/02/2022] Open
Abstract
Background Heart valve replacement in neonates and infants is one of the remaining unsolved problems in cardiac surgery because conventional valve prostheses do not grow with the children. Similarly, heart valve replacement in children and young adults with contraindications to anticoagulation remains an unsolved problem because mechanical valves are thrombogenic and bioprosthetic valves are prone to early degeneration. Therefore, there is an urgent clinical need for growing heart valve replacements that are durable without the need for anticoagulation. Methods A human cadaver model was used to develop surgical techniques for aortic valve xenotransplantation. Results Aortic valve xenotransplantation is technically feasible. Subcoronary implantation of the valve avoids the need for a root replacement. Conclusion Aortic valve xenotransplantation is promising because the development of GTKO.hCD46.hTBM transgenic pigs has brought xenotransplantation within clinical reach.
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Affiliation(s)
- Jennie H Kwon
- Division of Cardiothoracic Surgery, Department of Surgery, Medical University of South Carolina, Charleston, USA.
| | - Morgan Hill
- Division of Cardiothoracic Surgery, Department of Surgery, Medical University of South Carolina, Charleston, USA
| | - Brielle Gerry
- Division of Cardiothoracic Surgery, Department of Surgery, Medical University of South Carolina, Charleston, USA
| | - Steven W Kubalak
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC, USA
| | - Muhammad Mohiuddin
- Xenotransplantation Program, University of Maryland School of Medicine, Washington, DC, USA
| | - Minoo N Kavarana
- Division of Cardiothoracic Surgery, Department of Surgery, Medical University of South Carolina, Charleston, USA
| | - T Konrad Rajab
- Division of Cardiothoracic Surgery, Department of Surgery, Medical University of South Carolina, Charleston, USA
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