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Márquez-González H, Hernández-Vásquez JG, Del Valle-Lom M, Yáñez-Gutiérrez L, Klünder-Klünder M, Almeida-Gutiérrez E, Koretzky SG. Failures of the Fontan System in Univentricular Hearts and Mortality Risk in Heart Transplantation: A Systematic Review and Meta-Analysis. Life (Basel) 2021; 11:1363. [PMID: 34947894 PMCID: PMC8709145 DOI: 10.3390/life11121363] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Revised: 11/12/2021] [Accepted: 11/13/2021] [Indexed: 02/07/2023] Open
Abstract
The Fontan procedure (FP) is the standard surgical treatment for Univentricular heart diseases. Over time, the Fontan system fails, leading to pathologies such as protein-losing enteropathy (PLE), plastic bronchitis (PB), and heart failure (HF). FP should be considered as a transitional step to the final treatment: heart transplantation (HT). This systematic review and meta-analysis aims to establish the risk of death following HT according to the presence of FP complications. There was a total of 691 transplanted patients in the 18 articles, immediate survival 88% (n = 448), survival from 1 to 5 years of 78% (n = 427) and survival from 5.1 to 10 years of 69% (n = 208), >10 years 61% (n = 109). The relative risk (RR) was 1.12 for PLE (95% confidence interval [CI] = 0.89-1.40, p = 0.34), 1.03 for HF (0.7-1.51, p = 0.88), 0.70 for Arrhythmias (0.39-1.24, p = 0.22), 0.46 for PB (0.08-2.72, p = 0.39), and 5.81 for CKD (1.70-19.88, p = 0.005). In patients with two or more failures, the RR was 1.94 (0.99-3.81, p = 0.05). After FP, the risk of death after HT is associated with CKD and with the presence of two or more failures.
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Affiliation(s)
- Horacio Márquez-González
- Department of Clinical Research, Federico Gómez Children’s Hospital, Mexico City 06720, Mexico; (H.M.-G.); (J.G.H.-V.); (M.D.V.-L.); (M.K.-K.)
- Centro Médico Nacional Siglo XXI, IMSS, Department Congenital Heart Diseases, Mexico City 06720, Mexico; (L.Y.-G.); (E.A.-G.)
| | - Jose Gustavo Hernández-Vásquez
- Department of Clinical Research, Federico Gómez Children’s Hospital, Mexico City 06720, Mexico; (H.M.-G.); (J.G.H.-V.); (M.D.V.-L.); (M.K.-K.)
| | - Montserrat Del Valle-Lom
- Department of Clinical Research, Federico Gómez Children’s Hospital, Mexico City 06720, Mexico; (H.M.-G.); (J.G.H.-V.); (M.D.V.-L.); (M.K.-K.)
| | - Lucelli Yáñez-Gutiérrez
- Centro Médico Nacional Siglo XXI, IMSS, Department Congenital Heart Diseases, Mexico City 06720, Mexico; (L.Y.-G.); (E.A.-G.)
| | - Miguel Klünder-Klünder
- Department of Clinical Research, Federico Gómez Children’s Hospital, Mexico City 06720, Mexico; (H.M.-G.); (J.G.H.-V.); (M.D.V.-L.); (M.K.-K.)
| | - Eduardo Almeida-Gutiérrez
- Centro Médico Nacional Siglo XXI, IMSS, Department Congenital Heart Diseases, Mexico City 06720, Mexico; (L.Y.-G.); (E.A.-G.)
| | - Solange Gabriela Koretzky
- Department of Clinical Research, Nacional de Cardiología “Ignacio Chávez”, Mexico City 14080, Mexico
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2
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Quail MA, Chan I, Sarna S, Hughes M, Muthurangu V. A preoperative estimate of central venous pressure is associated with early Fontan failure. J Thorac Cardiovasc Surg 2021; 161:1426-1434. [PMID: 32747130 DOI: 10.1016/j.jtcvs.2020.06.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Revised: 06/05/2020] [Accepted: 06/07/2020] [Indexed: 10/24/2022]
Abstract
OBJECTIVE Early Fontan failure is a serious complication after total cavopulmonary connection, characterized by high central venous pressure, low cardiac output, and resistance to medical therapy. This study aimed to estimate postoperative central venous pressure in patients with total cavopulmonary connection using data routinely collected during preoperative assessment. We sought to determine if this metric correlated with measured postoperative central venous pressure and if it was associated with early Fontan failure. METHODS In this retrospective study, central venous pressure in total cavopulmonary connection was estimated in 131 patients undergoing pre-total cavopulmonary connection assessment by cardiac magnetic resonance imaging and central venous pressure measurement under general anesthesia. Postoperative central venous pressure during the first 24 hours in the intensive care unit was collected from electronic patient records in a subset of patients. Early Fontan failure was defined as death, transplantation, total cavopulmonary connection takedown, or emergency fenestration within the first 30 days. RESULTS Estimated central venous pressure in total cavopulmonary connection correlated significantly with central venous pressure during the first 24 hours in the intensive care unit (r = 0.26, P = .03), particularly in patients without a fenestration (r = 0.45, P = .01). Central venous pressure in total cavopulmonary connection was significantly associated with early Fontan failure (odds ratio, 1.1; 95% confidence interval, 1.01-1.21; P = .03). A threshold of central venous pressure in total cavopulmonary connection 33 mm Hg or greater was found to have the highest specificity (90%) and sensitivity (58%) for identifying early Fontan failure (area under receiver operating curve = 0.73; odds ratio, 12.4; 95% confidence interval, 2.5-62.3; P = .002). This association was stronger in patients with single superior vena cava. CONCLUSIONS Estimated central venous pressure in total cavopulmonary connection is an easily calculated metric combining preoperative pressure and flow data. Higher central venous pressure in total cavopulmonary connection is associated with an increased risk of early Fontan failure and is correlated with directly measured post-total cavopulmonary connection pressure. Identification of patients at risk of early Fontan failure has the potential to guide risk-mitigation strategies.
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Affiliation(s)
- Michael A Quail
- Centre for Cardiovascular Imaging, UCL Institute of Cardiovascular Science & Great Ormond Street Hospital for Children, London, United Kingdom.
| | - Ignatius Chan
- Centre for Cardiovascular Imaging, UCL Institute of Cardiovascular Science & Great Ormond Street Hospital for Children, London, United Kingdom
| | - Shiv Sarna
- Centre for Cardiovascular Imaging, UCL Institute of Cardiovascular Science & Great Ormond Street Hospital for Children, London, United Kingdom
| | - Marina Hughes
- Adult Congenital Heart Disease Unit, Royal Papworth Hospital NHS Foundation Trust, Cambridge, United Kingdom
| | - Vivek Muthurangu
- Centre for Cardiovascular Imaging, UCL Institute of Cardiovascular Science & Great Ormond Street Hospital for Children, London, United Kingdom
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3
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Marathe SP, Iyengar AJ, Betts KS, du Plessis K, Salve GG, Justo RN, Venugopal P, Winlaw DS, d'Udekem Y, Alphonso N. Long-term outcomes following Fontan takedown in Australia and New Zealand. J Thorac Cardiovasc Surg 2021; 161:1126-1135. [DOI: 10.1016/j.jtcvs.2020.09.074] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 08/28/2020] [Accepted: 09/19/2020] [Indexed: 11/26/2022]
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Hassan W, Kotak S, Khatri M, Ahmed A, Ahmed J, Ali SS, Khan TM. Efficacy of heart transplantation in patients with a failing Fontan: a systematic review and meta-analysis. THE CARDIOTHORACIC SURGEON 2021. [DOI: 10.1186/s43057-021-00043-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Abstract
Background
As the population of patients with Fontan palliation grows, so does the number of patients with Fontan failure, necessitating heart transplantation. However, due to mainly small-sized studies, outcomes after heart transplantation in these patients remain unclear. The objective of this study was to review the available literature and conduct a meta-analysis to provide well-powered and generalizable estimates of outcomes after heart transplantation in patients with a failing Fontan.
Main text
PubMed, Embase, and MEDLINE databases were searched for original studies of patients with a failing Fontan who underwent heart transplantation. The outcomes included were 1-year and 5-year survival, acute rejection, renal dysfunction, sepsis, and multi-organ failure. Proportions were pooled using random effects models to derive pooled proportions (PPs) and corresponding 95% confidence intervals (CIs). Meta-regression analysis was done to study the effects of age and gender on key outcomes. Sixteen retrospective single-center cohort studies with 426 Fontan patients undergoing heart transplantation were included in this meta-analysis. Pooled analysis of this study further revealed that 1-year survival after heart transplantation was 79.9% ([75.8%, 83.7%]; I2 = 1.92%), and 5-year survival rate was 72.5% ([62.1%, 81.9%]; I2 = 72.12%). Secondary outcomes after heart transplantation of failed Fontan procedure were acute rejection (PP 20% [7.4%, 36.8%]; I2 = 72.48%), renal dysfunction (PP 31.3% [10.5%, 57.2%]; I2 = 75.42%), multi-organ failure (PP 18.6% [2.8 to 43.9%]; I2= 69.60%), and sepsis (PP 21.1% [9%, 36.8%]; I2 = 61.19%).
Conclusion
Cardiac transplantation in patients with a failing Fontan is associated with acceptable interventional success and improved survival rates.
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5
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Trezzi M. Commentary: Fontan takedown: The journey off the beaten path. J Thorac Cardiovasc Surg 2020; 161:1137-1138. [PMID: 33127085 DOI: 10.1016/j.jtcvs.2020.09.128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 09/30/2020] [Accepted: 09/30/2020] [Indexed: 11/27/2022]
Affiliation(s)
- Matteo Trezzi
- Department of Pediatric Cardiology and Cardiac Surgery, Bambino Gesù Children's Hospital IRCCS, Rome, Italy.
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6
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Mizrahi M, Beckerman Z. Commentary: How to avoid early Fontan failure? J Thorac Cardiovasc Surg 2020; 161:1435-1436. [PMID: 32778462 DOI: 10.1016/j.jtcvs.2020.07.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 06/25/2020] [Accepted: 07/01/2020] [Indexed: 11/15/2022]
Affiliation(s)
- Michelle Mizrahi
- Texas Center for Pediatric and Congenital Heart Disease, UT Health Austin/Dell Children's Medical Center, Austin, Tex; Department of Surgery and Perioperative Care, University of Texas at Austin Dell Medical School, Austin, Tex
| | - Ziv Beckerman
- Texas Center for Pediatric and Congenital Heart Disease, UT Health Austin/Dell Children's Medical Center, Austin, Tex; Department of Surgery and Perioperative Care, University of Texas at Austin Dell Medical School, Austin, Tex.
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Choi RS, DiNardo JA, Brown ML. Superior Cavopulmonary Connection: Its Physiology, Limitations, and Anesthetic Implications. Semin Cardiothorac Vasc Anesth 2020; 24:337-348. [PMID: 32646291 DOI: 10.1177/1089253220939361] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The superior cavopulmonary connection (SCPC) or "bidirectional Glenn" is an integral, intermediate stage in palliation of single ventricle patients to the Fontan procedure. The procedure, normally performed at 3 to 6 months of life, increases effective pulmonary blood flow and reduces the ventricular volume load in patients with single ventricle (parallel circulation) physiology. While the SCPC, with or without additional sources of pulmonary blood flow, cannot be considered a long-term palliation strategy, there are a subset of patients who require SCPC palliation for a longer interval than the typical patient. In this article, we will review the physiology of SCPC, the consequences of prolonged SCPC palliation, and modes of failure. We will also discuss strategies to augment pulmonary blood flow in the presence of an SCPC. The anesthetic considerations in SCPC patients will also be discussed, as these patients may present for noncardiac surgery from infancy to adulthood.
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Affiliation(s)
- Ray S Choi
- Children's Hospital Colorado, Denver, CO, USA.,Boston Children's Hospital, Boston, MA, USA
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Trezzi M, Cetrano E, Giannico S, Iorio FS, Albanese SB, Carotti A. Long-Term Outcomes After Extracardiac Fontan Takedown to an Intermediate Palliative Circulation. Ann Thorac Surg 2018; 105:599-605. [DOI: 10.1016/j.athoracsur.2017.05.068] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Revised: 05/16/2017] [Accepted: 05/16/2017] [Indexed: 11/29/2022]
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9
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Kenny LA, DeRita F, Nassar M, Dark J, Coats L, Hasan A. Transplantation in the single ventricle population. Ann Cardiothorac Surg 2018; 7:152-159. [PMID: 29492393 DOI: 10.21037/acs.2018.01.16] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The single ventricle patient population comprises the most complex cohort presenting to the cardiac transplant team, in terms of demographics, anatomic substrate, and unique physiology. It is also the most rapidly growing diagnostic group presenting for heart transplantation. In this manuscript, we aim to describe the changing landscape of transplantation in single ventricle conditions through reflection on our own institution's practice and experience, alongside contemporary literature review. Single ventricle patients are heterogeneous in terms of age, anatomic diagnosis and physiology according to surgical stage of repair. Progress in surgical palliative strategies has impacted upon the present composition of the population, with growing numbers of hypoplastic left heart syndrome patients and those with late physiology failure following Fontan completion. Multiple prior surgeries, immunological sensitivity and multi-organ involvement impart high peri-operative risk but can be mitigated in part by careful pre-operative planning by a dedicated multi-disciplinary team addressing issues such as planning of concurrent reconstructive surgery, minimizing the post-operative effect of collaterals, timely harvesting, oversizing of donor organs to minimize graft failure, and strategies to address anticipated post-operative elevation in pulmonary vascular resistance. Determining optimal timing for transplant in these patients remains unclear, but understanding the risk of alternative surgical options can help guide decision making with regards to listing.
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Affiliation(s)
- Louise A Kenny
- Adult Congenital and Paediatric Heart Unit, Freeman Hospital, Newcastle upon Tyne NHS Foundation Trust, Newcastle Upon Tyne, UK
| | - Fabrizio DeRita
- Adult Congenital and Paediatric Heart Unit, Freeman Hospital, Newcastle upon Tyne NHS Foundation Trust, Newcastle Upon Tyne, UK
| | - Mohamed Nassar
- Adult Congenital and Paediatric Heart Unit, Freeman Hospital, Newcastle upon Tyne NHS Foundation Trust, Newcastle Upon Tyne, UK.,Cardiothoracic Surgery Department, Alexandria University, Alexandria, Egypt
| | - John Dark
- Adult Congenital and Paediatric Heart Unit, Freeman Hospital, Newcastle upon Tyne NHS Foundation Trust, Newcastle Upon Tyne, UK.,Institute of Cellular Medicine, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK
| | - Louise Coats
- Adult Congenital and Paediatric Heart Unit, Freeman Hospital, Newcastle upon Tyne NHS Foundation Trust, Newcastle Upon Tyne, UK.,Cardiovascular Research Centre, Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK
| | - Asif Hasan
- Adult Congenital and Paediatric Heart Unit, Freeman Hospital, Newcastle upon Tyne NHS Foundation Trust, Newcastle Upon Tyne, UK
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10
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Meta-Analysis of the Effectiveness of Heart Transplantation in Patients With a Failing Fontan. Am J Cardiol 2017; 119:1269-1274. [PMID: 28233535 DOI: 10.1016/j.amjcard.2017.01.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Revised: 01/03/2017] [Accepted: 01/03/2017] [Indexed: 12/20/2022]
Abstract
The Fontan procedure is increasingly being used to palliate univentricular physiology. It is a complex anatomic and physiologic repair that can fail at any age, often leaving heart transplantation as the only remaining solution. A meta-analysis was performed to achieve the aim of systematically evaluating the existing evidence for survival after heart transplantation in patients who have undergone a Fontan palliation. MEDLINE, Embase, PubMed, and Web of Science were searched for original research studies. The primary outcome was mortality at 1 and 5 years after transplantation. Five hundred eighty-two records were screened, after the removal of duplicates, 12 retrospective observational studies were selected for inclusion in our meta-analysis. This encompassed a total of 351 Fontan patients undergoing heart transplantation. Mean age was 14 years (range 7 to 24 years) and 65% were men. One- and 5-year survival rates after heart transplantation were found to be 80.3% (95% CI 75.9% to 84.2%) and 71.2% (95% CI 66.3% to 75.7%), respectively. No significant association was found between age, gender, and pulmonary pressures and 1-year mortality. In conclusion, in the largest analysis to date, we found that heart transplantation in younger patients after Fontan procedure has an acceptable early and mid-term mortality. It is comparable to published mortality data of heart transplantation for other forms of congenital heart disease. Heart transplantation in the younger failing Fontan population appears to be a reasonable option when all other avenues have been exhausted and appropriate screening has taken place.
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11
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The Long-Term Management of Children and Adults with a Fontan Circulation: A Systematic Review and Survey of Current Practice in Australia and New Zealand. Pediatr Cardiol 2017; 38:56-69. [PMID: 27787594 DOI: 10.1007/s00246-016-1484-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Accepted: 10/15/2016] [Indexed: 01/28/2023]
Abstract
Although long-term survival is now the norm, Fontan patients face significant morbidity and premature mortality. Wide variation exists in long-term Fontan management. With an aim of improving their long-term management, we conducted a systematic review to identify best available evidence and gaps in knowledge for future research focus. We also surveyed cardiologists in Australia and New Zealand managing Fontan patients, to determine the alignment of current local practice with best available evidence. A systematic review was conducted using strict search criteria (PRISMA guidelines), pertaining to long-term Fontan management. All adult congenital and paediatric cardiologists registered with The Australia and New Zealand Fontan Registry were invited to respond to an online survey. Reasonable quality evidence exists for non-inferiority of aspirin over warfarin for thromboprophylaxis in standard-risk Fontan patients. No strong evidence is currently available for the routine use of ACE inhibitors, beta blockers or pulmonary vasodilators. Little evidence exists regarding optimal arrhythmia treatment, exercise restriction/prescription, routine fenestration closure, elective Fontan conversion and screening/management of liver abnormalities. Although pregnancy is generally well tolerated, there are high rates of miscarriage and premature delivery. Thirty-nine out of 78 (50 %) cardiologists responded to the survey. Heterogeneity in response was demonstrated with regard to long-term anti-coagulation, other medication use, fenestration closure and pregnancy and contraception counselling. Substantial gaps in our knowledge remain with regard to the long-term management of Fontan patients. This is reflected in the survey of cardiologists managing these patients. We have identified a number of key areas for future research.
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12
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Lin SN, Huang SC, Chen YS, Chih NH, Wang CH, Chou NK, Yu HY, Wu IH, Shun CT, Wang SS. Case Series: Heart Transplantation After Fontan Operation-Single-Center Experience. Transplant Proc 2016; 48:959-64. [PMID: 27234779 DOI: 10.1016/j.transproceed.2016.01.037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Accepted: 01/14/2016] [Indexed: 11/30/2022]
Abstract
BACKGROUND Fontan failure (FF) occurs rarely. In patients with Fontan failure, heart transplantation is believed to be the most effective therapy. We review our experience in heart transplantations after the Fontan operation. METHODS From July 1987 to December 2014, 4 of 513 patients underwent orthotopic heart transplantation (OHT). Among them, 4 were due to FF. We reviewed these 4 cases via retrospective chart review. Clinical history, laboratory data, surgical technique, perioperative variables, and outcomes of long-term follow-up are presented herein. The primary outcomes were hospital mortality, 1-year-survival rate, and 4-year-survival rate. The secondary outcome is the improvement in patients with protein-losing enteropathy. RESULTS The hospital mortality rate was 0% in the 4 FF patients receiving OHT. No surgically related hemorrhage or infection was observed. The 1-year-survival rate was 100% (n = 4) and the 4-year-survival rate 50% (n = 2). One patient died of posttransplantation lymphoproliferative disorder. Hypoalbuminemia improved in 1 of 3 patients 4 months after OHT. CONCLUSIONS Despite technical challenges, heart transplantation can be performed successfully in patients with Fontan operation. However, protein-losing enteropathy might not be resolved quickly after heart transplantation.
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Affiliation(s)
- S-N Lin
- Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan
| | - S-C Huang
- Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan
| | - Y-S Chen
- Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan
| | - N-H Chih
- Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan
| | - C-H Wang
- Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan
| | - N-K Chou
- Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan
| | - H-Y Yu
- Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan
| | - I-H Wu
- Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan
| | - C-T Shun
- Department of Pathology, National Taiwan University Hospital, Taipei, Taiwan
| | - S-S Wang
- Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan; Department of Surgery, Fu Jen Catholic University Hospital, and Fu Jen Catholic University College of Medicine, New Taipei City, Taiwan.
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13
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Ross HJ, Law Y, Book WM, Broberg CS, Burchill L, Cecchin F, Chen JM, Delgado D, Dimopoulos K, Everitt MD, Gatzoulis M, Harris L, Hsu DT, Kuvin JT, Martin CM, Murphy AM, Singh G, Spray TL, Stout KK. Transplantation and Mechanical Circulatory Support in Congenital Heart Disease. Circulation 2016; 133:802-20. [DOI: 10.1161/cir.0000000000000353] [Citation(s) in RCA: 102] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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14
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De Rita F, Crossland D, Griselli M, Hasan A. Management of the failing Fontan. Semin Thorac Cardiovasc Surg Pediatr Card Surg Annu 2016; 18:2-6. [PMID: 25939836 DOI: 10.1053/j.pcsu.2015.01.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 12/11/2014] [Accepted: 01/11/2015] [Indexed: 11/11/2022]
Abstract
With and increasing number of early survivors after the palliation of the single ventricle physiology there is a burgeoning Fontan population worldwide that will pose unique challenges because of the inevitable sequelae related to the absence of the alleged "needless" sub-pulmonic ventricle. The increasing number and older-age single-ventricle patients highlights the results of successful contemporary surgical palliation in children, leading to the development of an adult single-ventricle population with unpredictable socio-economic and health service impacts. The wide variability in clinical status of patients with Fontan circulation reflects not only the broadened spectrum of morphological substrates involved, but also the evolving surgical techniques during the last four decades. This has come in the wake of a gradual understanding of an incredibly tricky physiology. The magnitude of the disease, the physio-pathological mechanisms, and the therapeutic options to optimize the "failing Fontan" status and to delay the irreversible deterioration of "Fontan failure" condition are discussed in this review.
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Affiliation(s)
- Fabrizio De Rita
- Department of Congenital Cardiothoracic Surgery, Freeman Hospital, Newcastle Upon Tyne, UK.
| | - David Crossland
- Department of Congenital Cardiology, Freeman Hospital, Newcastle Upon Tyne, UK
| | - Massimo Griselli
- Department of Congenital Cardiothoracic Surgery, Freeman Hospital, Newcastle Upon Tyne, UK
| | - Asif Hasan
- Department of Congenital Cardiothoracic Surgery, Freeman Hospital, Newcastle Upon Tyne, UK
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15
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Mauchley DC, Mitchell MB. Transplantation in the Fontan patient. Semin Thorac Cardiovasc Surg Pediatr Card Surg Annu 2015; 18:7-16. [PMID: 25939837 DOI: 10.1053/j.pcsu.2015.01.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Revised: 12/30/2014] [Accepted: 01/08/2015] [Indexed: 06/04/2023]
Abstract
The failing Fontan circulation presents difficult treatment challenges. When Fontan revision and or intervention for treatable arrhythmias is not feasible, heart transplantation is the only therapeutic option. Particular challenges presented by these patients include limited ability to assess hemodynamics, complex anatomy, multiple prior procedures, and unique underlying pathologic states. These issues complicate the decision-making process for further surgical intervention verses transplantation. The pre-transplant evaluation, transplant operation, and post-operative management are more problematic for these patients compared with most patients undergoing transplantation. Consequently, failing Fontan patients constitute one of the highest risk heart transplant subsets.
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Affiliation(s)
- David C Mauchley
- Instructor of Surgery, Department of Surgery, Division of Cardiothoracic Surgery, University of Colorado at Denver Health Sciences Center, Aurora, CO
| | - Max B Mitchell
- Professor of Surgery, Department of Surgery, Division of Cardiothoracic Surgery, University of Colorado at Denver Health Sciences Center and Children's Hospital Colorado Heart Institute, Aurora, CO.
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16
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Derk G, Laks H, Biniwale R, Patel S, De LaCruz K, Mazor E, Williams R, Valdovinos J, Levi DS, Reardon L, Aboulhosn J. Novel techniques of mechanical circulatory support for the right heart and Fontan circulation. Int J Cardiol 2014; 176:828-32. [DOI: 10.1016/j.ijcard.2014.08.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2014] [Accepted: 08/02/2014] [Indexed: 11/16/2022]
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A paired membrane umbrella double-lumen cannula ensures consistent cavopulmonary assistance in a Fontan sheep model. J Thorac Cardiovasc Surg 2014; 148:1041-7; discussion 1047. [PMID: 24930609 DOI: 10.1016/j.jtcvs.2014.04.051] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 03/25/2014] [Accepted: 04/02/2014] [Indexed: 01/19/2023]
Abstract
OBJECTIVES The Avalon Elite (Macquet, Rastatt, Germany) double-lumen cannula can provide effective cavopulmonary assistance in a Fontan (total cavopulmonary connection) sheep model, but it requires strict alignment. The objective was to fabricate and test a newly designed paired umbrella double-lumen cannula without alignment requirement. METHODS The paired membrane umbrellas were designed on the double-lumen cannula to bracket infusion blood flow toward the pulmonary artery. Two umbrellas were attached, one 4 cm above and one 4 cm below the infusion opening. Umbrellas were temporarily wrapped and glued to the double-lumen cannula body to facilitate insertion. A total cavopulmonary connection mock loop was used to test cavopulmonary assistance performance and reliability with double-lumen cannula rotation and displacement. The paired umbrella double-lumen cannula also was tested in a total cavopulmonary connection adult sheep model (n = 6). RESULTS The bench test showed up to 4.5 L/min pumping flow and approximately 90% pumping flow efficiency at 360° rotation and 8-cm displacement of double-lumen cannula. The total cavopulmonary connection model with compromised hemodynamics was successfully created in all 6 sheep. The cavopulmonary assistance double-lumen cannula with paired umbrellas was smoothly inserted into the superior vena cava and extracardiac conduit in all sheep. At 3.5 to 4.0 L/min pump flow, the systolic arterial blood pressure and central venous pressure returned to normal baseline and remained stable throughout the 90-minute experiment, demonstrating effective cavopulmonary assistance support. Double-lumen cannula rotation and displacement did not affect performance. Autopsy revealed well-opened and positioned paired umbrellas, and double-lumen cannulas were easily removed from the right jugular vein. CONCLUSIONS Our double-lumen cannula with paired umbrellas is easy to insert and remove. The paired umbrellas eliminated the strict alignment requirement and ensured consistent cavopulmonary assistance performance.
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Murtuza B, Fenton M, Burch M, Gupta A, Muthialu N, Elliott MJ, Hsia TY, Tsang VT, Kostolny M. Pediatric heart transplantation for congenital and restrictive cardiomyopathy. Ann Thorac Surg 2013; 95:1675-84. [PMID: 23561807 DOI: 10.1016/j.athoracsur.2013.01.014] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Revised: 01/06/2013] [Accepted: 01/08/2013] [Indexed: 01/15/2023]
Abstract
BACKGROUND Recent reports suggest worse outcomes in pediatric orthotopic heart transplantation (OHT) for congenital heart disease (CHD) and restrictive cardiomyopathy (RCM). We examined early outcomes in these diverse groups of patients in comparison with patients with dilatated cardiomyopathy (DCM). METHODS From 2000 to 2011, 209 patients were included: 50 with CHD, 23 with RCM, and 136 with DCM. Early survival was studied, as was the occurrence of acute rejection, donor-specific antibodies (DSAs) and nondonor-specific antibodies (NSDAs), incidence of pulmonary hypertension (PHT), right ventricular failure (RVF), and the need for mechanical circulatory support (MCS). RESULTS The incidence of preoperative PHT was greatest in the RCM group (χ(2)p = 0.0006); the requirement for mechanical support before OHT was greatest in patients with DCM. Thirty-day survival was 92.0%, 97.1%, and 100% for patients with CHD, DCM, and RCM respectively. The incidence of RVF was highest for patients with RCM (43.5%; versus CHD, 26.0%; versus DCM, 14.7%). One-year survival estimates for patients with CHD, DCM, and RCM were 92.0%, 97.8%, and 82.6%, respectively (log-rank p = 0.165). Multivariable analysis revealed 4 significant risk factors for mortality: age, incidence of acute rejection, preoperative PHT, and the presence of NDSAs. The occurrence of DSAs was similar, although there was a significantly higher incidence of NDSAs in the CHD and RCM groups (36.0% and 30.4%, respectively, versus 14.0% in the DCM group; χ(2)p = 0.0024). CONCLUSIONS Equivalent outcomes are achievable in pediatric OHT despite marked heterogeneity in anatomic and physiologic complexity in recipients. Physiologic factors such as PHT are likely to be more important than anatomic complexities in determining survival. The potential relevance of NDSAs warrants further investigation.
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Affiliation(s)
- Bari Murtuza
- Department of Cardiac Surgery, Great Ormond Street Hospital for Children, London, United Kingdom
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Hetzer R, Weng Y, Delmo Walter EM. State of the art in paediatric heart transplantation: the Berlin experience. Eur J Cardiothorac Surg 2012. [PMID: 23184909 DOI: 10.1093/ejcts/ezs588] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Enormous progress has been made in paediatric heart transplantation since the first unsuccessful effort by Kantrowitz in 1967. Early reports of children undergoing heart transplantation showed alarmingly high perioperative mortality rates of 25-60%, with the diagnosis of congenital heart disease (CHD) representing a particularly high-risk subset compared with cardiomyopathy. Many of these early failures were related to poor patient selection, suboptimal immunosuppression and technical problems. We learned a great deal from these earlier difficulties. Presently, with more refined techniques, better-defined patient selection criteria, excellent graft rejection monitoring and optimal immunosuppression, the ISHLT 2011 registry reported a 10-year survival rate of 60% for patients transplanted for end-stage CHD and >70% for those transplanted for cardiomyopathy. The technical dilemmas in complex CHD were overcome by surgical ingenuity and creativity, innovative solutions and careful surgical planning, adapting the complex recipient anatomy to the normal donor anatomy. The miniaturized Berlin Heart pulsatile ventricular assist devices in children as a bridge to transplantation have revolutionized treatment and become a significant contribution in heart-failure therapy. The intramyocardial electrogram and echocardiographic strain rate imaging have been employed as non-invasive techniques of rejection monitoring. Immunosuppressive drugs have a major impact on the development and progression of cardiac allograft vasculopathy, the main cause of cardiac allograft loss and a leading cause of mortality after the first year post-transplantation. The questions of whether a transplanted heart in a newborn grows to adult size along with the child and whether the dimensional cardiac growth allows adequate function over time have been largely answered in our previous investigations. As more transplanted children reach adulthood, concerns about their life expectancy when they have reached 10 years of life post-transplant are raised, particularly with respect to establishing partnerships and families, their ability to earn a living and the fulfilment of personal life perspectives. Some heart-transplanted patients require retransplantation to remain alive. The disparity between the demand for and supply of donor hearts makes retransplantation an ethical issue. We 'do not refuse' any patient who needs retransplantation. Mechanical circulatory support devices for long-term use are now largely available to accommodate such cases.
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Affiliation(s)
- Roland Hetzer
- Department of Cardiothoracic and Vascular Surgery, Deutsches Herzzentrum Berlin, Berlin, Germany
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Pauliks LB, Ündar A. Heart Transplantation for Congenital Heart Disease. World J Pediatr Congenit Heart Surg 2011; 2:603-8. [DOI: 10.1177/2150135111410078] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Congenital heart disease affects 0.8% of all live-born infants. Some of the malformed hearts can at best be palliated by conventional surgical or catheter interventions from the start. Others fail slowly from chronic overloading. Patients with congenital heart disease have been among the first transplant recipients since 1967. Primary therapy with infant heart transplant is a convincing concept from an immunological perspective but large-scale implementation is limited by donor organ shortages. Another growing area is rescue therapy for older patients with end-stage heart failure after palliative procedures, particularly those with single-ventricle hearts, systemic right ventricles, and associated arrhythmias.
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Affiliation(s)
- Linda B. Pauliks
- Pediatric Cardiology, Department of Pediatrics, Penn State Hershey Children’s Hospital, Hershey, PA, USA
- Department of Pediatrics, Penn State Hershey Pediatric Cardiovascular Research Center, Hershey, PA, USA
| | - Akif Ündar
- Pediatric Cardiology, Department of Pediatrics, Penn State Hershey Children’s Hospital, Hershey, PA, USA
- Department of Pediatrics, Penn State Hershey Pediatric Cardiovascular Research Center, Hershey, PA, USA
- Department of Surgery, Penn State Milton S. Hershey Medical Center, Penn State Hershey College of Medicine, Penn State Hershey Children’s Hospital, Hershey, PA, USA
- Department of Bioengineering, Penn State Milton S. Hershey Medical Center, Penn State Hershey College of Medicine, Penn State Hershey Children’s Hospital, Hershey, PA, USA
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Wang D, Plunkett M, Lynch J, Zhou X, Ballard-Croft C, Zwischenberger JB. Wang-Zwische double-lumen cannula leads to total cavopulmonary support in a failing Fontan sheep model. Ann Thorac Surg 2011; 91:1956-60. [PMID: 21531379 DOI: 10.1016/j.athoracsur.2011.02.031] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2010] [Revised: 02/07/2011] [Accepted: 02/11/2011] [Indexed: 10/18/2022]
Abstract
BACKGROUND We are developing a total cavopulmonary support system for failing Fontan physiology using the percutaneous Wang-Zwische double-lumen cannula (DLC). METHODS We developed a sheep model of failing Fontan physiology through a right thoracotomy in 5 sheep. An extracardiac conduit was anastomosed to the inferior vena cava and superior vena cava, and a graft was applied to connect the conduit and the right pulmonary artery (PA) to create total vena cava-to-PA diversion, excluding the right heart. The DLC (commercialized as AvalonElite, Avalon Laboratories LLC, Rancho Dominguez, CA) was coupled with a CentriMag pump (Levitronix Waltham, MA) to form a cavopulmonary support system. The DLC was inserted through the right jugular vein and the superior vena cava into the extracardiac conduit with the infusion lumen opening aligned with the right PA bridge. Blood was withdrawn from the superior vena cava and the inferior vena cava through the drainage lumen and pumped into the right PA through the infusion lumen, with flow adjusted to 4.0±0.5 L/min. RESULTS A successful Fontan model was created without cardiopulmonary bypass. After total venous blood diversion from the vena cava to the right PA artery, failing Fontan physiology developed, evidenced by elevated central venous pressure and dropping mean PA pressure and systolic arterial pressure. The DLC was successfully inserted, and hemodynamics were normalized in all 5 sheep for the duration of the 2-hour study. CONCLUSIONS We created a model of failing Fontan circulation in sheep without cardiopulmonary bypass. The DLC system achieved total cavopulmonary support for 2 hours in our failing Fontan sheep model.
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Affiliation(s)
- Dongfang Wang
- Department of Surgery, University of Kentucky College of Medicine, Lexington, Kentucky 40536-0298, USA
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Rood KL, Teele SA, Barrett CS, Salvin JW, Rycus PT, Fynn-Thompson F, Laussen PC, Thiagarajan RR. Extracorporeal membrane oxygenation support after the Fontan operation. J Thorac Cardiovasc Surg 2011; 142:504-10. [PMID: 21353253 DOI: 10.1016/j.jtcvs.2010.11.050] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2010] [Revised: 10/08/2010] [Accepted: 11/25/2010] [Indexed: 02/06/2023]
Abstract
OBJECTIVE Extracorporeal membrane oxygenation has been used to support children with cardiac failure after the Fontan operation. Mortality is high, and causes of mortality remain unclear. We evaluated the in-hospital mortality and factors associated with mortality in these patients. METHODS Extracorporeal Life Support Organization registry data on patients requiring extracorporeal membrane oxygenation after the Fontan operation from 1987 to 2009 were retrospectively analyzed. Demographics and extracorporeal membrane oxygenation data were compared for survivors and nonsurvivors. A multivariable logistic regression model was used to identify factors associated with mortality. RESULTS Of 230 patients, 81 (35%) survived to hospital discharge. Cardiopulmonary resuscitation was more frequent (34% vs 17%, P = .04), and median fraction of inspired oxygen concentration was higher (1 [confidence interval, 0.9-1.0] vs 0.9 [confidence interval, 0.8-1.0], P = .03) before extracorporeal membrane oxygenation in nonsurvivors compared with survivors. Extracorporeal membrane oxygenation duration and incidence of complications, including surgical bleeding, neurologic injury, renal failure, inotrope use on extracorporeal membrane oxygenation, and bloodstream infection, were higher in nonsurvivors compared with survivors (P < .05 for all). In a multivariable model, neurologic injury (odds ratio, 5.18; 95% confidence interval, 1.97-13.61), surgical bleeding (odds ratio, 2.36; 95% confidence interval, 1.22-4.56), and renal failure (odds ratio, 2.81; 95% confidence interval, 1.41-5.59) increased mortality. Extracorporeal membrane oxygenation duration of more than 65 hours to 119 hours (odds ratio, 0.33; 95% confidence interval, 0.14-0.76) was associated with decreased mortality. CONCLUSIONS Cardiac failure requiring extracorporeal membrane oxygenation after the Fontan operation is associated with high mortality. Complications during extracorporeal membrane oxygenation support increase mortality odds. Prompt correction of surgical bleeding when possible may improve survival.
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Affiliation(s)
- Kelly L Rood
- Department of Cardiology, Children's Hospital Boston, Mass 02115, USA.
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Davies RR, Chen JM, Mosca RS. The Fontan procedure: evolution in technique; attendant imperfections and transplantation for "failure". Semin Thorac Cardiovasc Surg Pediatr Card Surg Annu 2011; 14:55-66. [PMID: 21444050 DOI: 10.1053/j.pcsu.2011.01.014] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Application of the Fontan procedure has allowed the survival of many patients with univentricular cardiac lesions into mid adulthood. Despite its ingenious design, implementation, and thoughtful modifications, its attendant hemodynamic perturbations persist; central venous hypertension and reduced cardiac output. These aberrations in physiology have led to pernicious changes in organ function. A more thorough understanding of these derangements and attempts at Fontan revision have temporized, yet the morbidity and patient attrition persists. Mechanical assistance to normalize the circulation is being investigated and holds some promise. At present, cardiac transplantation remains the last stage of palliation for many.
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Affiliation(s)
- Ryan R Davies
- Department of Cardiothoracic Surgery, Stanford University/Lucille Packard Children's Hospital, Palo Alto, CA, USA
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Gewillig M, Brown SC, Eyskens B, Heying R, Ganame J, Budts W, La Gerche A, Gorenflo M. The Fontan circulation: who controls cardiac output? Interact Cardiovasc Thorac Surg 2009; 10:428-33. [PMID: 19995891 DOI: 10.1510/icvts.2009.218594] [Citation(s) in RCA: 193] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
In a Fontan circuit the mechanisms involved in control of cardiac output at rest and during exercise differ significantly from normal. The classical model presumes an unlimited preload which is not available in the Fontan circuit. This review critically analyses the role of contractility, heart rate, and afterload and highlights the importance of pulmonary vascular resistance (PVR) in determining adequate preload and, therefore, cardiac output in these patients. A conceptual model of the determinants of cardiac output in Fontan patients is presented.
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Affiliation(s)
- Marc Gewillig
- Paediatric and Congenital Cardiology, University Hospitals Leuven, Belgium.
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Sodian R, Weber S, Markert M, Loeff M, Lueth T, Weis FC, Daebritz S, Malec E, Schmitz C, Reichart B. Pediatric cardiac transplantation: three-dimensional printing of anatomic models for surgical planning of heart transplantation in patients with univentricular heart. J Thorac Cardiovasc Surg 2008; 136:1098-9. [PMID: 18954663 DOI: 10.1016/j.jtcvs.2008.03.055] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2007] [Revised: 02/14/2008] [Accepted: 03/23/2008] [Indexed: 11/30/2022]
Affiliation(s)
- Ralf Sodian
- Department of Cardiac Surgery, Ludwig-Maximilians-University, Munich, Germany.
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Modeling the Fontan circulation: where we are and where we need to go. Pediatr Cardiol 2008; 29:3-12. [PMID: 17917765 DOI: 10.1007/s00246-007-9104-0] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2007] [Revised: 06/30/2007] [Accepted: 07/03/2007] [Indexed: 10/22/2022]
Abstract
The Fontan procedure and its subsequent modifications over the past 30 years can be described as a class of surgical procedures for patients born with complex congenital heart disease exhibiting a single-ventricle physiology. The long-term outcome for children currently undergoing a Fontan procedure remains worrisome because of multiple late morbidities observed. Despite significant modeling efforts spanning three decades, improvements to the Fontan procedure have occurred without comprehensive validation from these modeling studies. Careful examination shows that modeling studies to date offer only a "glimpse through a keyhole" into understanding and modeling a representative range of the variations in anatomy and physiology that exist in Fontan patients. Suggestions for future investigations are provided.
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Almond CSD, Mayer JE, Thiagarajan RR, Blume ED, del Nido PJ, McElhinney DB. Outcome After Fontan Failure and Takedown to an Intermediate Palliative Circulation. Ann Thorac Surg 2007; 84:880-7. [PMID: 17720394 DOI: 10.1016/j.athoracsur.2007.02.092] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2006] [Revised: 02/26/2007] [Accepted: 02/28/2007] [Indexed: 11/27/2022]
Abstract
BACKGROUND Fontan takedown to an intermediate palliative circulation is an important treatment option for patients with acute or subacute failure of a Fontan circulation from a variety of causes. Little is known about the subsequent outcome of these patients or their potential candidacy for a second attempt at Fontan completion. METHODS Patients followed up at Children's Hospital Boston who underwent takedown of a Fontan circulation to an intermediate palliative circulation within 1 year of Fontan completion were reviewed. RESULTS Between 1979 and 2006, 53 patients underwent Fontan takedown at a median age of 2.3 years (range, 0.3 to 36.5 years). Takedown was performed during the Fontan procedure itself in 12 patients (22%), within the first postoperative month in 31(58%), and between 1 month and 1 year in 10 (18%). Overall, 29 patients (55%) survived the early period after takedown, and 19 ultimately underwent successful Fontan completion a median of 4.6 years after takedown; all but one was alive a median of 6.4 years later. Thirteen (68%) of the 19 had treatable abnormalities contributing to Fontan failure. CONCLUSIONS Fontan takedown can provide effective stabilization of the acutely or subacutely failing Fontan circulation, although a substantial number of patients die early despite Fontan takedown. Subjects surviving the perioperative period can often undergo uneventful redo Fontan. A thorough evaluation for treatable abnormalities should be performed in all patients with a failing Fontan circulation and in patients who undergo Fontan takedown.
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