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Nguyen SN, Bouhout I, Singh S, Vinogradsky AV, Chung MM, Sevensky R, Kalfa DM, Bacha EA, Goldstone AB. Long-term autograft dilation and durability after the Ross procedure are similar in infants, children, and adolescents with primary aortic stenosis. J Thorac Cardiovasc Surg 2024; 168:1182-1191.e3. [PMID: 38266984 DOI: 10.1016/j.jtcvs.2024.01.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Revised: 11/24/2023] [Accepted: 01/16/2024] [Indexed: 01/26/2024]
Abstract
BACKGROUND Autograft durability and remodeling are thought to be superior in younger pediatric patients after the Ross operation. We sought to delineate the fate of autografts across the pediatric age spectrum in patients with primary aortic stenosis (AS). METHODS We retrospectively reviewed patients age ≤18 years with primary AS who underwent the Ross operation between 1993 and 2020. Patients were categorized by age. The primary endpoint was autograft dimensional change, and secondary endpoints were severe neo-aortic insufficiency (AI) and autograft reintervention. RESULTS A total of 119 patients underwent the Ross operation, including 37 (31.1%) in group I (age <18 months), 24 (20.2%) in group II (age 18 months-8 years), and 58 (48.7%) in group III (age 8-18 years). All groups exhibited similar annular growth rates within the first 5 postoperative years, followed by a collective decrease in annulus growth rates from year 5 to year 10. Group III experienced rapid sinus dilation in the first 5 years, followed by stabilization of the sinus z-score from year 5 to year 10, whereas groups I and II demonstrated stable sinus z-scores over 10 years. There were 4 early deaths (3.4%) and 2 late deaths (1.7%) at a median follow-up of 8.1 years (range, 0.01-26.3 years). At 15 years, the incidences of severe neo-AI (0.0 ± 0.0% vs 0.0 ± 0.0% vs 3.9 ± 3.9%; P = .52) and autograft reintervention (8.4 ± 6.0% vs 0.0 ± 0.0% vs 2.4 ± 2.4%; P = .47) were similar in the 3 groups. CONCLUSIONS Age at the time of Ross operation for primary AS does not influence long-term autograft remodeling or durability. Other physiologic or technical factors are likely greater determinants of autograft fate.
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Affiliation(s)
- Stephanie N Nguyen
- Section of Pediatric and Congenital Cardiac Surgery, Division of Cardiac, Thoracic, and Vascular Surgery, New York Presbyterian-Morgan Stanley Children's Hospital, Columbia University Irving Medical Center, New York, NY
| | - Ismail Bouhout
- Section of Pediatric and Congenital Cardiac Surgery, Division of Cardiac, Thoracic, and Vascular Surgery, New York Presbyterian-Morgan Stanley Children's Hospital, Columbia University Irving Medical Center, New York, NY
| | - Sameer Singh
- Section of Pediatric and Congenital Cardiac Surgery, Division of Cardiac, Thoracic, and Vascular Surgery, New York Presbyterian-Morgan Stanley Children's Hospital, Columbia University Irving Medical Center, New York, NY
| | - Alice V Vinogradsky
- Section of Pediatric and Congenital Cardiac Surgery, Division of Cardiac, Thoracic, and Vascular Surgery, New York Presbyterian-Morgan Stanley Children's Hospital, Columbia University Irving Medical Center, New York, NY
| | - Megan M Chung
- Section of Pediatric and Congenital Cardiac Surgery, Division of Cardiac, Thoracic, and Vascular Surgery, New York Presbyterian-Morgan Stanley Children's Hospital, Columbia University Irving Medical Center, New York, NY
| | - Riley Sevensky
- Section of Pediatric and Congenital Cardiac Surgery, Division of Cardiac, Thoracic, and Vascular Surgery, New York Presbyterian-Morgan Stanley Children's Hospital, Columbia University Irving Medical Center, New York, NY
| | - David M Kalfa
- Section of Pediatric and Congenital Cardiac Surgery, Division of Cardiac, Thoracic, and Vascular Surgery, New York Presbyterian-Morgan Stanley Children's Hospital, Columbia University Irving Medical Center, New York, NY
| | - Emile A Bacha
- Section of Pediatric and Congenital Cardiac Surgery, Division of Cardiac, Thoracic, and Vascular Surgery, New York Presbyterian-Morgan Stanley Children's Hospital, Columbia University Irving Medical Center, New York, NY
| | - Andrew B Goldstone
- Section of Pediatric and Congenital Cardiac Surgery, Division of Cardiac, Thoracic, and Vascular Surgery, New York Presbyterian-Morgan Stanley Children's Hospital, Columbia University Irving Medical Center, New York, NY.
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2
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Middendorp E, Braeu F, Baaijens FPT, Humphrey JD, Cyron CJ, Loerakker S. Computational analysis of heart valve growth and remodeling after the Ross procedure. Biomech Model Mechanobiol 2024:10.1007/s10237-024-01874-y. [PMID: 39269523 DOI: 10.1007/s10237-024-01874-y] [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: 02/27/2024] [Accepted: 07/02/2024] [Indexed: 09/15/2024]
Abstract
During the Ross procedure, an aortic heart valve is replaced by a patient's own pulmonary valve. The pulmonary autograft subsequently undergoes substantial growth and remodeling (G&R) due to its exposure to increased hemodynamic loads. In this study, we developed a homogenized constrained mixture model to understand the observed adaptation of the autograft leaflets in response to the changed hemodynamic environment. This model was based on the hypothesis that tissue G&R aims to preserve mechanical homeostasis for each tissue constituent. To model the Ross procedure, we simulated the exposure of a pulmonary valve to aortic pressure conditions and the subsequent G&R of the valve. Specifically, we investigated the effects of assuming either stress- or stretch-based mechanical homeostasis, the use of blood pressure control, and the effect of root dilation. With this model, we could explain different observations from published clinical studies, such as the increase in thickness, change in collagen organization, and change in tissue composition. In addition, we found that G&R based on stress-based homeostasis could better capture the observed changes in tissue composition than G&R based on stretch-based homeostasis, and that root dilation or blood pressure control can result in more leaflet elongation. Finally, our model demonstrated that successful adaptation can only occur when the mechanically induced tissue deposition is sufficiently larger than tissue degradation, such that leaflet thickening overrules leaflet dilation. In conclusion, our findings demonstrated that G&R based on mechanical homeostasis can capture the observed heart valve adaptation after the Ross procedure. Finally, this study presents a novel homogenized mixture model that can be used to investigate other cases of heart valve G&R as well.
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Affiliation(s)
- Elmer Middendorp
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands
- Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Fabian Braeu
- Singapore Eye Research Institute, Singapore National Eye Center, Singapore, Singapore
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Singapore-MIT Alliance for Research and Technology, Singapore, Singapore
| | - Frank P T Baaijens
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands
- Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Jay D Humphrey
- Department of Biomedical Engineering, Yale University, New Haven, USA
| | - Christian J Cyron
- Institute for Continuum and Material Mechanics, Hamburg University of Technology, Hamburg, Germany
- Helmholtz-Zentrum, Institute for Material Systems Modeling, Geesthacht, Germany
| | - Sandra Loerakker
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands.
- Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, The Netherlands.
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3
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Maes L, Vervenne T, Hendrickx A, Estrada AC, Van Hoof L, Verbrugghe P, Rega F, Jones EAV, Humphrey JD, Famaey N. Cell signaling and tissue remodeling in the pulmonary autograft after the Ross procedure: A computational study. J Biomech 2024; 171:112180. [PMID: 38906711 DOI: 10.1016/j.jbiomech.2024.112180] [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: 01/02/2024] [Revised: 03/20/2024] [Accepted: 05/31/2024] [Indexed: 06/23/2024]
Abstract
In the Ross procedure, a patient's pulmonary valve is transplanted in the aortic position. Despite advantages of this surgery, reoperation is still needed in many cases due to excessive dilatation of the pulmonary autograft. To further understand the failure mechanisms, we propose a multiscale model predicting adaptive processes in the autograft at the cell and tissue scale. The cell-scale model consists of a network model, that includes important signaling pathways and relations between relevant transcription factors and their target genes. The resulting gene activity leads to changes in the mechanical properties of the tissue, modeled as a constrained mixture of collagen, elastin and smooth muscle. The multiscale model is calibrated with findings from experiments in which seven sheep underwent the Ross procedure. The model is then validated against a different set of sheep experiments, for which a qualitative agreement between model and experiment is found. Model outcomes at the cell scale, including the activity of genes and transcription factors, also match experimentally obtained transcriptomics data.
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Affiliation(s)
- Lauranne Maes
- BioMechanics, Department of Mechanical Engineering, KU Leuven, Leuven, Belgium.
| | - Thibault Vervenne
- BioMechanics, Department of Mechanical Engineering, KU Leuven, Leuven, Belgium
| | - Amber Hendrickx
- Cardiac Surgery, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Ana C Estrada
- Department of Biomedical Engineering, Yale University, New Haven CT, USA
| | - Lucas Van Hoof
- Cardiac Surgery, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Peter Verbrugghe
- Cardiac Surgery, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Filip Rega
- Cardiac Surgery, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Elizabeth A V Jones
- Centre for Molecular and Vascular Biology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium; CARIM School for Cardiovascular Diseases, Department of Cardiology, Maastricht University, Maastricht, Netherlands
| | - Jay D Humphrey
- Department of Biomedical Engineering, Yale University, New Haven CT, USA
| | - Nele Famaey
- BioMechanics, Department of Mechanical Engineering, KU Leuven, Leuven, Belgium
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4
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Peters MC, Kruithof BPT, Bouten CVC, Voets IK, van den Bogaerdt A, Goumans MJ, van Wijk A. Preservation of human heart valves for replacement in children with heart valve disease: past, present and future. Cell Tissue Bank 2024; 25:67-85. [PMID: 36725733 PMCID: PMC10902036 DOI: 10.1007/s10561-023-10076-2] [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: 01/12/2023] [Accepted: 01/29/2023] [Indexed: 02/03/2023]
Abstract
Valvular heart disease affects 30% of the new-borns with congenital heart disease. Valve replacement of semilunar valves by mechanical, bioprosthetic or donor allograft valves is the main treatment approach. However, none of the replacements provides a viable valve that can grow and/or adapt with the growth of the child leading to re-operation throughout life. In this study, we review the impact of donor valve preservation on moving towards a more viable valve alternative for valve replacements in children or young adults.
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Affiliation(s)
- M C Peters
- Department of Pediatric Cardiothoracic Surgery, Wilhelmina Children's Hospital, University Medical Center Utrecht, 3584 EA, Utrecht, The Netherlands.
- Department of Cardiovascular Cell Biology, Leiden University Medical Center, 2300 RC, Leiden, The Netherlands.
- Department of Biomedical Engineering, Eindhoven University of Technology, 5600 MB, Eindhoven, The Netherlands.
| | - B P T Kruithof
- Department of Cardiovascular Cell Biology, Leiden University Medical Center, 2300 RC, Leiden, The Netherlands
- Department of Cardiology, Leiden University Medical Center, 2333 ZA, Leiden, The Netherlands
| | - C V C Bouten
- Department of Biomedical Engineering, Eindhoven University of Technology, 5600 MB, Eindhoven, The Netherlands
- Institute for Complex Molecular Systems, Eindhoven University of Technology, 5600 MB, Eindhoven, The Netherlands
| | - I K Voets
- Institute for Complex Molecular Systems, Eindhoven University of Technology, 5600 MB, Eindhoven, The Netherlands
- Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, 5600 MB, Eindhoven, The Netherlands
| | - A van den Bogaerdt
- Heart Valve Department, ETB-BISLIFE Multi Tissue Center, 2333 BD, Beverwijk, The Netherlands
| | - M J Goumans
- Department of Cardiovascular Cell Biology, Leiden University Medical Center, 2300 RC, Leiden, The Netherlands
| | - A van Wijk
- Department of Pediatric Cardiothoracic Surgery, Wilhelmina Children's Hospital, University Medical Center Utrecht, 3584 EA, Utrecht, The Netherlands
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Notenboom ML, Van Hoof L, Schuermans A, Takkenberg JJM, Rega FR, Taverne YJHJ. Aortic Valve Embryology, Mechanobiology, and Second Messenger Pathways: Implications for Clinical Practice. J Cardiovasc Dev Dis 2024; 11:49. [PMID: 38392263 PMCID: PMC10888685 DOI: 10.3390/jcdd11020049] [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: 12/24/2023] [Revised: 01/22/2024] [Accepted: 01/29/2024] [Indexed: 02/24/2024] Open
Abstract
During the Renaissance, Leonardo Da Vinci was the first person to successfully detail the anatomy of the aortic root and its adjacent structures. Ever since, novel insights into morphology, function, and their interplay have accumulated, resulting in advanced knowledge on the complex functional characteristics of the aortic valve (AV) and root. This has shifted our vision from the AV as being a static structure towards that of a dynamic interconnected apparatus within the aortic root as a functional unit, exhibiting a complex interplay with adjacent structures via both humoral and mechanical stimuli. This paradigm shift has stimulated surgical treatment strategies of valvular disease that seek to recapitulate healthy AV function, whereby AV disease can no longer be seen as an isolated morphological pathology which needs to be replaced. As prostheses still cannot reproduce the complexity of human nature, treatment of diseased AVs, whether stenotic or insufficient, has tremendously evolved, with a similar shift towards treatments options that are more hemodynamically centered, such as the Ross procedure and valve-conserving surgery. Native AV and root components allow for an efficient Venturi effect over the valve to allow for optimal opening during the cardiac cycle, while also alleviating the left ventricle. Next to that, several receptors are present on native AV leaflets, enabling messenger pathways based on their interaction with blood and other shear-stress-related stimuli. Many of these physiological and hemodynamical processes are under-acknowledged but may hold important clues for innovative treatment strategies, or as potential novel targets for therapeutic agents that halt or reverse the process of valve degeneration. A structured overview of these pathways and their implications for cardiothoracic surgeons and cardiologists is lacking. As such, we provide an overview on embryology, hemodynamics, and messenger pathways of the healthy and diseased AV and its implications for clinical practice, by relating this knowledge to current treatment alternatives and clinical decision making.
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Affiliation(s)
- Maximiliaan L Notenboom
- Department of Cardiothoracic Surgery, Erasmus University Medical Center, 3000 CA Rotterdam, The Netherlands
| | - Lucas Van Hoof
- Department of Cardiac Surgery, University Hospitals Leuven, 3000 Leuven, Belgium
| | - Art Schuermans
- Department of Cardiac Surgery, University Hospitals Leuven, 3000 Leuven, Belgium
| | - Johanna J M Takkenberg
- Department of Cardiothoracic Surgery, Erasmus University Medical Center, 3000 CA Rotterdam, The Netherlands
| | - Filip R Rega
- Department of Cardiac Surgery, University Hospitals Leuven, 3000 Leuven, Belgium
| | - Yannick J H J Taverne
- Department of Cardiothoracic Surgery, Erasmus University Medical Center, 3000 CA Rotterdam, The Netherlands
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6
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Bilodeau KS, Mauchley DC, DeRoo S, Burke CR. Dissemination and implementation analysis of the Ross procedure in adults: time to update the guidelines? THE CARDIOTHORACIC SURGEON 2023; 31:28. [PMID: 38152292 PMCID: PMC10752239 DOI: 10.1186/s43057-023-00119-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 12/09/2023] [Indexed: 12/29/2023] Open
Abstract
Background The science of dissemination and implementation (D&I) aims to improve the quality and effectiveness of care by addressing the challenges of incorporating research and evidence-based practice into routine clinical practice. This lens of D&I has challenged the interpretation and incorporation of data, noting that failure of a given therapy may not reflect lack of efficacy, but instead reflect an imperfect implementation. The aim of this manuscript is to review the influence of the Ross procedure's historical context on its D&I. Methods A contextual baseline of the Ross procedure was defined from the procedure's original description in the literature to major publications since the 2017 valvular heart disease guidelines. D&I evaluation was conducted using the Consolidated Framework for Implementation Research (CFIR), using constructs from each of the five respective domains to define the main determinants. Results Each of the five CFIR domains appears to be correlated with a factor influencing the Ross procedure's varied history of enthusiasm and acceptance. The complex nature of Ross required adaptation for optimization, with a strong correlation of center volume on outcomes that were not considered in non-contemporary studies. Outcomes later published from those studies influenced social and cultural contexts within the aortic surgery community, and led to further organizational uncertainty, resulting in slow guideline incorporation. Conclusions The D&I of the Ross procedure was a result of inadequate appreciation of technical complexity, effect of patient selection, and complex aortic surgery experience, resulting in dismissal of an efficacious procedure due to a misunderstanding of effectiveness.
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Affiliation(s)
- Kyle S. Bilodeau
- Department of Surgery, Division of Cardiothoracic Surgery, University of Washington, Seattle, WA USA
| | - David C. Mauchley
- Department of Surgery, Division of Cardiac Surgery, Seattle Children’s Hospital, Seattle, WA USA
| | - Scott DeRoo
- Department of Surgery, Division of Cardiothoracic Surgery, University of Washington, Seattle, WA USA
| | - Christopher R. Burke
- Department of Surgery, Division of Cardiothoracic Surgery, University of Washington, Seattle, WA USA
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7
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Vervenne T, Maes L, Van Hoof L, Rega F, Famaey N. Drivers of vascular growth and remodeling: A computational framework to promote benign adaptation in the Ross procedure. J Mech Behav Biomed Mater 2023; 148:106170. [PMID: 37852088 DOI: 10.1016/j.jmbbm.2023.106170] [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: 08/17/2023] [Revised: 10/04/2023] [Accepted: 10/09/2023] [Indexed: 10/20/2023]
Abstract
In the sixties, Dr Donald Ross designed a surgical solution for young patients with aortic valve disease by using the patients' own pulmonary valve. The Ross procedure is the only aortic valve replacement technique that can restore long-term survival and preserve quality of life. The main failure mode of the Ross procedure is wall dilatation, potentially leading to valve regurgitation and leakage. Dilatation occurs due to the inability of the pulmonary autograft to adapt to the sudden increase in loading when exposing to aortic pressures. Previous experimental data has shown that a permanent external support wrapped around the artery can prevent the acute dilatation of the arterial wall. However, the textile support leads to stress-shielding phenomena due to the loss of mechanical wall compliance. We present a pragmatic and modular computational framework of arterial growth and remodeling predicting the long-term outcomes of cardiovascular tissue adaptation, with and without textile wrapping. The model integrates mean, systolic and diastolic pressures and assumes the resulting wall stresses to drive the biological remodeling rules. Rather than a single mean pressure or stress deviation from the homeostatic state, we demonstrate that only pulsatile stresses can predict available experimental results. Therefore, we suggest that a biodegradable external support could induce benign remodeling in the Ross procedure. Indeed, a biodegradable textile wrapped around the autograft fulfills the trade-off between prevention of acute dilatation on the one hand and recovery of arterial wall compliance on the other hand. After further validation, the computational framework can set the basis for the development of an actual biodegradable external support for the Ross procedure with optimized polymer mechanical properties and degradation behavior.
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Affiliation(s)
- Thibault Vervenne
- Biomechanics Section, Mechanical Engineering Department, KU Leuven, Celestijnenlaan 300, Leuven, 3001, Belgium.
| | - Lauranne Maes
- Biomechanics Section, Mechanical Engineering Department, KU Leuven, Celestijnenlaan 300, Leuven, 3001, Belgium
| | - Lucas Van Hoof
- Cardiac Surgery, Department of Cardiovascular Sciences, KU Leuven, UZ Herestraat 49, Leuven, 3000, Belgium
| | - Filip Rega
- Cardiac Surgery, Department of Cardiovascular Sciences, KU Leuven, UZ Herestraat 49, Leuven, 3000, Belgium
| | - Nele Famaey
- Biomechanics Section, Mechanical Engineering Department, KU Leuven, Celestijnenlaan 300, Leuven, 3001, Belgium
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8
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Maes L, Vervenne T, Van Hoof L, Jones EAV, Rega F, Famaey N. Computational modeling reveals inflammation-driven dilatation of the pulmonary autograft in aortic position. Biomech Model Mechanobiol 2023; 22:1555-1568. [PMID: 36764979 DOI: 10.1007/s10237-023-01694-6] [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: 05/16/2022] [Accepted: 01/17/2023] [Indexed: 02/12/2023]
Abstract
The pulmonary autograft in the Ross procedure, where the aortic valve is replaced by the patient's own pulmonary valve, is prone to failure due to dilatation. This is likely caused by tissue degradation and maladaptation, triggered by the higher experienced mechanical loads in aortic position. In order to further grasp the causes of dilatation, this study presents a model for tissue growth and remodeling of the pulmonary autograft, using the homogenized constrained mixture theory and equations for immuno- and mechano-mediated mass turnover. The model outcomes, compared to experimental data from an animal model of the pulmonary autograft in aortic position, show that inflammation likely plays an important role in the mass turnover of the tissue constituents and therefore in the autograft dilatation over time. We show a better match and prediction of long-term outcomes assuming immuno-mediated mass turnover, and show that there is no linear correlation between the stress-state of the material and mass production. Therefore, not only mechanobiological homeostatic adaption should be taken into account in the development of growth and remodeling models for arterial tissue in similar applications, but also inflammatory processes.
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Affiliation(s)
- Lauranne Maes
- Biomechanics Section, Mechanical Engineering Department, KU Leuven, Celestijnenlaan 300 box 2419, 3001, Leuven, Belgium.
| | - Thibault Vervenne
- Biomechanics Section, Mechanical Engineering Department, KU Leuven, Celestijnenlaan 300 box 2419, 3001, Leuven, Belgium
| | - Lucas Van Hoof
- Cardiac Surgery, Department of Cardiovascular Sciences, KU Leuven, UZ Herestraat 49 box 276, 3000, Leuven, Belgium
| | - Elizabeth A V Jones
- Centre for Molecular and Vascular Biology, KU Leuven, UZ Herestraat 49 box 911, 3000, Leuven, Belgium
| | - Filip Rega
- Cardiac Surgery, Department of Cardiovascular Sciences, KU Leuven, UZ Herestraat 49 box 276, 3000, Leuven, Belgium
| | - Nele Famaey
- Biomechanics Section, Mechanical Engineering Department, KU Leuven, Celestijnenlaan 300 box 2419, 3001, Leuven, Belgium
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Cleveland JD, Bansal N, Wells WJ, Wiggins LM, Kumar SR, Starnes VA. Ross procedure in neonates and infants: A valuable operation with defined limits. J Thorac Cardiovasc Surg 2023; 165:262-272.e3. [PMID: 35599209 DOI: 10.1016/j.jtcvs.2022.04.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 02/07/2022] [Accepted: 04/06/2022] [Indexed: 12/16/2022]
Abstract
OBJECTIVE The Ross procedure is an important tool that offers autologous tissue repair for severe left ventricular outflow tract (LVOT) pathology. Previous reports show that risk of mortality is highest among neonates and infants. We analyzed our institutional experience within this patient cohort to identify factors that most affect clinical outcome. METHODS A retrospective chart review identified all Ross operations in neonates and infants at our institution over 27 years. The entire study population was analyzed to determine risk factors for mortality and define outcomes for survival and reintervention. RESULTS Fifty-eight patients underwent a Ross operation at a median age of 63 (range, 9-156) days. Eighteen (31%) were neonates. Eleven (19%) patients died before hospital discharge. Multiple regression analysis of the entire cohort identified young age (hazard ratio [HR], 1.037; P = .0045), Shone complex (HR, 17.637; P = .009), and interrupted aortic arch with ventricular septal defect (HR, 16.01; P = .031) as independent predictors of in-hospital mortality. Receiver operating characteristic analysis (area under the curve, 0.752) indicated age younger than 84 days to be the inflection point at which mortality risk increases. Of the 47 survivors, there were 2 late deaths with a mean follow-up of 6.7 (range, 2.1-13.1) years. Three patients (6%) required LVOT reintervention at 3, 8, and 17.5 years, respectively, and 26 (55%) underwent right ventricular outflow tract reintervention at a median of 6 (range, 2.5-10.3) years. CONCLUSIONS Ross procedure is effective in children less than one year of age with left sided obstructive disease isolated to the aortic valve and/or aortic arch. Patients less than 3 months of age with Shone or IAA/VSD are at higher risk for morbidity and mortality. Survivors experience excellent intermediate-term freedom from LVOT reintervention.
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Affiliation(s)
- John D Cleveland
- Division of Cardiac Surgery, Department of Surgery, Keck School of Medicine of the University of Southern California, Los Angeles, Calif; Heart Institute, Children's Hospital Los Angeles, Los Angeles, Calif.
| | - Neeraj Bansal
- Division of Cardiac Surgery, Department of Surgery, Keck School of Medicine of the University of Southern California, Los Angeles, Calif
| | - Winfield J Wells
- Division of Cardiac Surgery, Department of Surgery, Keck School of Medicine of the University of Southern California, Los Angeles, Calif; Heart Institute, Children's Hospital Los Angeles, Los Angeles, Calif
| | - Luke M Wiggins
- Division of Cardiac Surgery, Department of Surgery, Keck School of Medicine of the University of Southern California, Los Angeles, Calif; Heart Institute, Children's Hospital Los Angeles, Los Angeles, Calif
| | - S Ram Kumar
- Division of Cardiac Surgery, Department of Surgery, Keck School of Medicine of the University of Southern California, Los Angeles, Calif; Heart Institute, Children's Hospital Los Angeles, Los Angeles, Calif
| | - Vaughn A Starnes
- Division of Cardiac Surgery, Department of Surgery, Keck School of Medicine of the University of Southern California, Los Angeles, Calif; Heart Institute, Children's Hospital Los Angeles, Los Angeles, Calif
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10
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Turner ME, Bartoli‐Leonard F, Aikawa E. Small particles with large impact: Insights into the unresolved roles of innate immunity in extracellular vesicle‐mediated cardiovascular calcification. Immunol Rev 2022; 312:20-37. [DOI: 10.1111/imr.13134] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Mandy E Turner
- Division of Cardiovascular Medicine Department of Medicine Center for Interdisciplinary Cardiovascular Sciences Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA
| | - Francesca Bartoli‐Leonard
- Division of Cardiovascular Medicine Department of Medicine Center for Interdisciplinary Cardiovascular Sciences Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA
| | - Elena Aikawa
- Division of Cardiovascular Medicine Department of Medicine Center for Interdisciplinary Cardiovascular Sciences Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA
- Division of Cardiovascular Medicine Department of Medicine Center for Excellence in Vascular Biology Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA
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11
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Biomechanics of Pulmonary Autograft as Living Tissue: A Systematic Review. Bioengineering (Basel) 2022; 9:bioengineering9090456. [PMID: 36135002 PMCID: PMC9495771 DOI: 10.3390/bioengineering9090456] [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] [Received: 07/27/2022] [Revised: 09/01/2022] [Accepted: 09/04/2022] [Indexed: 11/17/2022] Open
Abstract
Introduction: The choice of valve substitute for aortic valve surgery is tailored to the patient with specific indications and contraindications to consider. The use of an autologous pulmonary artery (PA) with a simultaneous homograft in the pulmonary position is called a Ross procedure. It permits somatic growth and the avoidance of lifelong anticoagulation. Concerns remain on the functionality of a pulmonary autograft in the aortic position when exposed to systemic pressure. Methods: A literature review was performed incorporating the following databases: Pub Med (1996 to present), Ovid Medline (1958 to present), and Ovid Embase (1982 to present), which was run on 1 January 2022 with the following targeted words: biomechanics of pulmonary autograft, biomechanics of Ross operation, aortic valve replacement and pulmonary autograph, aortic valve replacement and Ross procedure. To address the issues with heterogeneity, studies involving the pediatric cohort were also analyzed separately. The outcomes measured were early- and late-graft failure alongside mortality. Results: a total of 8468 patients were included based on 40 studies (7796 in pediatric cohort and young adult series and 672 in pediatric series). There was considerable experience accumulated by various institutions around the world. Late rates of biomechanical failure and mortality were low and comparable to the general population. The biomechanical properties of the PA were superior to other valve substitutes. Mathematical and finite element analysis studies have shown the potential stress-shielding effects of the PA root. Conclusion: The Ross procedure has excellent durability and longevity in clinical and biomechanical studies. The use of external reinforcements such as semi-resorbable scaffolds may further extend their longevity.
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12
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Oeser C, Uyanik-Uenal K, Kocher A, Laufer G, Andreas M. The Ross procedure in adult patients: a single-Centre analysis of long-term results up to 28 years. Eur J Cardiothorac Surg 2022; 62:6631263. [PMID: 35789266 DOI: 10.1093/ejcts/ezac379] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 05/26/2022] [Accepted: 07/01/2022] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES This study aimed to provide an in-depth insight into our single-centre experience with the Ross procedure. METHODS All adults who underwent the Ross procedure between 1991 and 2014 were included. Based on the total number of Ross procedures performed by each surgeon at our centre during this 24-year period, surgeon volume was classified as low (<25 procedures), intermediate (25-44 procedures), and high (≥45 procedures). Survival, complications and reinterventions were evaluated. A single cardiologist assessed the pulmonary autograft's function and the neoaortic root diameter by echocardiography. RESULTS The outcomes of 224 patients [176 men, 48 women; mean age 37.2 (standard deviation 10.0) years] were analysed. Patients operated on by a low-volume surgeon had 7.22 times higher odds (P < 0.001) for a serious adverse event during the intraoperative or early postoperative course than patients operated on by a high-volume surgeon. Early mortality was 1.8%. Overall survival was 87.3% at 20 years. Compared with the demographically matched general population, the patients' survival was significantly lower (P = 0.002). The cumulative incidence of autograft and right ventricular outflow tract conduit reintervention was 21.5% and 5.9% at 20 years, respectively. Patients with preoperative aortic regurgitation had 6.25 times the subdistribution hazard of autograft reintervention (Bonferroni-adjusted P = 0.042) and a higher neoaortic root z-score [1.37 (standard deviation 2.04) versus 0.17 (standard deviation 1.81), P = 0.004] than patients with aortic stenosis. In patients with preoperative aortic regurgitation, autograft wrapping (remnant aortic wall and/or Vicryl® mesh) was associated with a 74% reduction in the subdistribution hazard of autograft reintervention (Bonferroni-adjusted P = 0.002) and with a reduced incidence of neoaortic root dilatation (P = 0.037). CONCLUSIONS The Ross procedure performed by a specialized surgeon provides very satisfying long-term results. The higher risk of autograft reintervention in preoperative aortic regurgitation may be counteracted by supporting the autograft.
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Affiliation(s)
- Claudia Oeser
- Department of Cardiac Surgery, Medical University of Vienna, Vienna, Austria
| | | | - Alfred Kocher
- Department of Cardiac Surgery, Medical University of Vienna, Vienna, Austria
| | - Guenther Laufer
- Department of Cardiac Surgery, Medical University of Vienna, Vienna, Austria
| | - Martin Andreas
- Department of Cardiac Surgery, Medical University of Vienna, Vienna, Austria
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13
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Nappi F. The role of the extracellular matrix in the development of heart valve disease: Underestimation or undercomprehension? J Card Surg 2022; 37:1623-1626. [PMID: 35352851 DOI: 10.1111/jocs.16445] [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: 03/14/2022] [Accepted: 03/15/2022] [Indexed: 11/26/2022]
Abstract
The function of metalloproteinases of the extracellular matrix and their inhibitors has emerged with a crucial role in valve diseases. Both the expression of matrix metalloproteinases and their inhibitors are susceptible to modification in patients with severe mitral insufficiency. This process is due to substantial changes in the collagen structure during mechanical stress on the mitral valve leaflets. Several studies have measured the level of deformation of the mitral leaflets with the use of the finite element analysis method by establishing the stiffness of the cellular and extracellular elements of the mitral valve leaflets. Evidence suggested the possible underestimation of the stiffness of the leaflets. This implies greater stress on the components of the extracellular matrix in the circumferential and radial strains that involve the mitral leaflets during chronic regurgitation. The remodeling process during mechanical stress phenomena involves both the cellular compartment and the extracellular matrix and can be adaptive or maladaptive as showed in patients who receive a pulmonary autograft to replace the diseased aortic valve. However, adaptive remodeling can be driven using resorbable polymers that interfere with the extracellular matrix. Further investigation is required for the understanding of the mechanisms that determine the structural changes of the extracellular matrix and to prevent them.
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Affiliation(s)
- Francesco Nappi
- Department of Cardiac Surgery, Centre Cardiologique du Nord, Saint-Denis, France
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14
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Mazine A, David TE, Stoklosa K, Chung J, Lafreniere-Roula M, Ouzounian M. Improved Outcomes Following the Ross Procedure Compared With Bioprosthetic Aortic Valve Replacement. J Am Coll Cardiol 2022; 79:993-1005. [PMID: 35272805 DOI: 10.1016/j.jacc.2021.12.026] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 11/15/2021] [Accepted: 12/08/2021] [Indexed: 12/29/2022]
Abstract
BACKGROUND The ideal aortic valve substitute for young and middle-aged adults remains elusive. OBJECTIVES This study sought to compare the long-term outcomes of patients undergoing the Ross procedure and those receiving bioprosthetic aortic valve replacements (AVRs). METHODS Consecutive patients aged 16-60 years who underwent a Ross procedure or surgical bioprosthetic AVR at the Toronto General Hospital between 1990 and 2014 were identified. Propensity score matching was used to account for differences in baseline characteristics. The primary outcome was all-cause mortality. Secondary outcomes included valve reintervention, valve deterioration, endocarditis, thromboembolic events, and permanent pacemaker implantation. RESULTS Propensity score matching yielded 108 pairs of patients. The median age was 41 years (IQR: 34-47 years). Baseline characteristics were similar between the matched groups. There was no operative mortality in either group. Mean follow-up was 14.5 ± 7.2 years. All-cause mortality was lower following the Ross procedure (HR: 0.35; 95% CI: 0.14-0.90; P = 0.028). Using death as a competing risk, the Ross procedure was associated with lower rates of reintervention (HR: 0.21; 95% CI: 0.10-0.41; P < 0.001), valve deterioration (HR: 0.25; 95% CI: 0.14-0.45; P < 0.001), thromboembolic events (HR: 0.15; 95% CI: 0.05-0.50; P = 0.002), and permanent pacemaker implantation (HR: 0.22; 95% CI: 0.07-0.64; P = 0.006). CONCLUSIONS In this propensity-matched study, the Ross procedure was associated with better long-term survival and freedom from adverse valve-related events compared with bioprosthetic AVR. In specialized centers with sufficient expertise, the Ross procedure should be considered the primary option for young and middle-aged adults undergoing AVR.
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Affiliation(s)
- Amine Mazine
- Division of Cardiovascular Surgery, Peter Munk Cardiac Centre, Toronto General Hospital and the University of Toronto, Toronto, Ontario, Canada
| | - Tirone E David
- Division of Cardiovascular Surgery, Peter Munk Cardiac Centre, Toronto General Hospital and the University of Toronto, Toronto, Ontario, Canada
| | - Klaudiusz Stoklosa
- Division of Cardiovascular Surgery, Peter Munk Cardiac Centre, Toronto General Hospital and the University of Toronto, Toronto, Ontario, Canada
| | - Jennifer Chung
- Division of Cardiovascular Surgery, Peter Munk Cardiac Centre, Toronto General Hospital and the University of Toronto, Toronto, Ontario, Canada
| | - Myriam Lafreniere-Roula
- Division of Cardiovascular Surgery, Peter Munk Cardiac Centre, Toronto General Hospital and the University of Toronto, Toronto, Ontario, Canada
| | - Maral Ouzounian
- Division of Cardiovascular Surgery, Peter Munk Cardiac Centre, Toronto General Hospital and the University of Toronto, Toronto, Ontario, Canada.
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15
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Fernández-Doblas J, Pamies-Catalán A, Abella RF. Cirugía de Ross y Ross-Konno en edad pediátrica: ¿es la edad un factor de riesgo? CIRUGIA CARDIOVASCULAR 2022. [DOI: 10.1016/j.circv.2022.02.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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16
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Bryan AY, Strong EB, Kidambi S, Gilligan-Steinberg S, Bennett-Kennett R, Lee JY, Imbrie-Moore A, Moye SC, Hendrickx-Rodriguez S, Wang H, Dauskardt RH, Woo YJ, Ma MR. Biomechanical Analysis of the Ross Procedure in an Ex Vivo Left Heart Simulator. World J Pediatr Congenit Heart Surg 2022; 13:166-174. [PMID: 35238706 PMCID: PMC11460983 DOI: 10.1177/21501351211070288] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Neo-aortic pulmonary autografts often experience root dilation and valve regurgitation over time. This study seeks to understand the biomechanical differences between aortic and neo-aortic pulmonary roots using a heart simulator. METHODS Porcine aortic, neo-aortic pulmonary, and pulmonary roots (n = 6) were mounted in a heart simulator (parameters: 100 mm Hg, 37 °C, 70 cycles per minute, 5.0 L/min cardiac output). Echocardiography was used to study root distensibility (percentage change in luminal diameter between systole and diastole) and valve function. Leaflet motion was tracked with high-speed videography. After 30 min in the simulator, leaflet thickness (via cryosectioning), and multiaxial modulus (via lenticular hydrostatic deformation testing) were obtained. RESULTS There were no significant differences between aortic and neo-aortic pulmonary leaflet motion, including mean opening velocity (218 vs 248 mm/s, P = .27) or mean closing velocity (116 vs 157 mm/s, P = .12). Distensibility was similar between aortic (8.5%, 1.56 mm) and neo-aortic pulmonary (7.8%, 1.12 mm) roots (P = .59). Compared to virgin controls, native pulmonic roots exposed to systemic pressure for 30 min had reduced leaflet thickness (630 vs 385 µm, P = .049) and a reduced Young's modulus (3,125 vs 1,089 kPa, P = .077). In contrast, the aortic roots exposed to pressure displayed no significant difference in aortic leaflet thickness (1,317 vs 1,256 µm, P = .27) or modulus (5,931 vs 3,631 kPa, P = .56). CONCLUSIONS Neo-aortic pulmonary roots demonstrated equivalence in valve function and distensibility but did experience changes in biomechanical properties and morphology. These changes may contribute to long-term complications associated with the Ross procedure.
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Affiliation(s)
| | | | | | | | | | - James Y. Lee
- Department of Cardiothoracic Surgery, Stanford University
| | - Annabel Imbrie-Moore
- Department of Cardiothoracic Surgery, Stanford University
- Department of Mechanical Engineering, Stanford University
| | | | | | - Hanjay Wang
- Department of Cardiothoracic Surgery, Stanford University
| | | | - Y. Joseph Woo
- Department of Cardiothoracic Surgery, Stanford University
- Department of Bioengineering, Stanford University
| | - Michael R. Ma
- Department of Cardiothoracic Surgery, Stanford University
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Van Hoof L, Verbrugghe P, Jones EAV, Humphrey JD, Janssens S, Famaey N, Rega F. Understanding Pulmonary Autograft Remodeling After the Ross Procedure: Stick to the Facts. Front Cardiovasc Med 2022; 9:829120. [PMID: 35224059 PMCID: PMC8865563 DOI: 10.3389/fcvm.2022.829120] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Accepted: 01/17/2022] [Indexed: 12/12/2022] Open
Abstract
The Ross, or pulmonary autograft, procedure presents a fascinating mechanobiological scenario. Due to the common embryological origin of the aortic and pulmonary root, the conotruncus, several authors have hypothesized that a pulmonary autograft has the innate potential to remodel into an aortic phenotype once exposed to systemic conditions. Most of our understanding of pulmonary autograft mechanobiology stems from the remodeling observed in the arterial wall, rather than the valve, simply because there have been many opportunities to study the walls of dilated autografts explanted at reoperation. While previous histological studies provided important clues on autograft adaptation, a comprehensive understanding of its determinants and underlying mechanisms is needed so that the Ross procedure can become a widely accepted aortic valve substitute in select patients. It is clear that protecting the autograft during the early adaptation phase is crucial to avoid initiating a sequence of pathological remodeling. External support in the freestanding Ross procedure should aim to prevent dilatation while simultaneously promoting remodeling, rather than preventing dilatation at the cost of vascular atrophy. To define the optimal mechanical properties and geometry for external support, the ideal conditions for autograft remodeling and the timeline of mechanical adaptation must be determined. We aimed to rigorously review pulmonary autograft remodeling after the Ross procedure. Starting from the developmental, microstructural and biomechanical differences between the pulmonary artery and aorta, we review autograft mechanobiology in relation to distinct clinical failure mechanisms while aiming to identify unmet clinical needs, gaps in current knowledge and areas for further research. By correlating clinical and experimental observations of autograft remodeling with established principles in cardiovascular mechanobiology, we aim to present an up-to-date overview of all factors involved in extracellular matrix remodeling, their interactions and potential underlying molecular mechanisms.
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Affiliation(s)
- Lucas Van Hoof
- Department of Cardiac Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Peter Verbrugghe
- Department of Cardiac Surgery, University Hospitals Leuven, Leuven, Belgium
| | | | - Jay D. Humphrey
- Department of Biomedical Engineering, Yale University, New Haven, CT, United States
| | - Stefan Janssens
- Department of Cardiology, University Hospitals Leuven, Leuven, Belgium
| | - Nele Famaey
- Biomechanics Section, KU Leuven, Leuven, Belgium
| | - Filip Rega
- Department of Cardiac Surgery, University Hospitals Leuven, Leuven, Belgium
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18
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Nappi F, Iervolino A, Avtaar Singh SS. The effectiveness and safety of pulmonary autograft as living tissue in Ross procedure: a systematic review. Transl Pediatr 2022; 11:280-297. [PMID: 35282027 PMCID: PMC8905099 DOI: 10.21037/tp-21-351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 01/14/2022] [Indexed: 11/06/2022] Open
Abstract
Background Reports on effectiveness and safety after the implant of pulmonary autograft (PA) living tissue in Ross procedure, to treat both congenital and acquired disease of the aortic valve and left ventricular outflow tract (LVOT), show variable durability results. We undertake a quantitative systematic review of evidence on outcome after the Ross procedure with the aim to improve insight into outcome and potential determinants. Methods A systematic search of reports published from October 1979 to January 2021 was conducted (PubMed, Ovid Medline, Ovid Embase and Cochrane library) reporting outcomes after the Ross procedure in patients with diseased aortic valve with or without LVOT. Inclusion criteria were observational studies reporting on mortality and/or morbidity after autograft aortic valve or root replacement, completeness of follow-up >90%, and study size n≥30. Forty articles meeting the inclusion criteria were allocated to two categories: pediatric patient series and young adult patient series. Results were tabulated for a clearer presentation. Results A total of 342 studies were evaluated of which forty studies were included in the final analysis as per the eligibility criteria. A total of 8,468 patients were included (7,796 in pediatric cohort and young adult series and 672 in pediatric series). Late mortality rates were remarkably low alongside similar age-matched mortality with the general population in young adults. There were differences in implantation techniques as regard the variability in stress and the somatic growth that recorded conflicting outcomes regarding the miniroot vs the subcoronary approach. Discussion The adaptability of lung autograft to allow for both stress variability and somatic growth make it an ideal conduit for Ross's operation. The use of the miniroot technique over subcoronary implantation for better adaptability to withstand varying degrees of stress is perhaps more applicable to different patient subgroups.
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Affiliation(s)
- Francesco Nappi
- Department of Cardiac Surgery, Centre Cardiologique du Nord, 93200 Saint-Denis, France
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19
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Human P, Bezuidenhout D, Aikawa E, Zilla P. Residual Bioprosthetic Valve Immunogenicity: Forgotten, Not Lost. Front Cardiovasc Med 2022; 8:760635. [PMID: 35059444 PMCID: PMC8764456 DOI: 10.3389/fcvm.2021.760635] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 12/13/2021] [Indexed: 12/02/2022] Open
Abstract
Despite early realization of the need to control inherent immunogenicity of bioprosthetic replacement heart valves and thereby mitigate the ensuing host response and its associated pathology, including dystrophic calcification, the problem remains unresolved to this day. Concerns over mechanical stiffness associated with prerequisite high cross-link density to effect abrogation of this response, together with the insinuated role of leaching glutaraldehyde monomer in subsequent dystrophic mineralization, have understandably introduced compromises. These have become so entrenched as a benchmark standard that residual immunogenicity of the extracellular matrix has seemingly been relegated to a very subordinate role. Instead, focus has shifted toward the removal of cellular compartment antigens renowned for their implication in the failure of vascularized organ xenotransplants. While decellularization certainly offers advantages, this review aims to refocus attention on the unresolved matter of the host response to the extracellular matrix. Furthermore, by implicating remnant immune and inflammatory processes to bioprosthetic valve pathology, including pannus overgrowth and mineralization, the validity of a preeminent focus on decellularization, in the context of inefficient antigen and possible residual microbial remnant removal, is questioned.
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Affiliation(s)
- Paul Human
- Chris Barnard Division of Cardiothoracic Surgery, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa.,Cardiovascular Research Unit, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Deon Bezuidenhout
- Chris Barnard Division of Cardiothoracic Surgery, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa.,Cardiovascular Research Unit, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Elena Aikawa
- Division of Cardiovascular Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, United States
| | - Peter Zilla
- Chris Barnard Division of Cardiothoracic Surgery, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa.,Cardiovascular Research Unit, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa.,Faculty of Health Sciences, Cape Heart Institute, University of Cape Town, Cape Town, South Africa
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20
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Butany J, Schoen FJ. Cardiac valve replacement and related interventions. Cardiovasc Pathol 2022. [DOI: 10.1016/b978-0-12-822224-9.00010-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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21
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Inflammatory and regenerative processes in bioresorbable synthetic pulmonary valves up to two years in sheep-Spatiotemporal insights augmented by Raman microspectroscopy. Acta Biomater 2021; 135:243-259. [PMID: 34509697 DOI: 10.1016/j.actbio.2021.09.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 08/18/2021] [Accepted: 09/06/2021] [Indexed: 12/14/2022]
Abstract
In situ heart valve tissue engineering is an emerging approach in which resorbable, off-the-shelf available scaffolds are used to induce endogenous heart valve restoration. Such scaffolds are designed to recruit endogenous cells in vivo, which subsequently resorb polymer and produce and remodel new valvular tissue in situ. Recently, preclinical studies using electrospun supramolecular elastomeric valvular grafts have shown that this approach enables in situ regeneration of pulmonary valves with long-term functionality in vivo. However, the evolution and mechanisms of inflammation, polymer absorption and tissue regeneration are largely unknown, and adverse valve remodeling and intra- and inter-valvular variability have been reported. Therefore, the goal of the present study was to gain a mechanistic understanding of the in vivo regenerative processes by combining routine histology and immunohistochemistry, using a comprehensive sheep-specific antibody panel, with Raman microspectroscopy for the spatiotemporal analysis of in situ tissue-engineered pulmonary valves with follow-up to 24 months from a previous preclinical study in sheep. The analyses revealed a strong spatial heterogeneity in the influx of inflammatory cells, graft resorption, and foreign body giant cells. Collagen maturation occurred predominantly between 6 and 12 months after implantation, which was accompanied by a progressive switch to a more quiescent phenotype of infiltrating cells with properties of valvular interstitial cells. Variability among specimens in the extent of tissue remodeling was observed for follow-up times after 6 months. Taken together, these findings advance the understanding of key events and mechanisms in material-driven in situ heart valve tissue engineering. STATEMENT OF SIGNIFICANCE: This study describes for the first time the long-term in vivo inflammatory and regenerative processes that underly in situ heart valve tissue engineering using resorbable synthetic scaffolds. Using a unique combinatorial analysis of immunohistochemistry and Raman microspectroscopy, important spatiotemporal variability in graft resorption and tissue formation was pinpointed in in situ tissue-engineered heart valves, with a follow-up time of up to 24 months in sheep. This variability was correlated to heterogenous regional cellular repopulation, most likely instigated by region-specific differences in surrounding tissue and hemodynamics. The findings of this research contribute to the mechanistic understanding of in situ tissue engineering using resorbable synthetics, which is necessary to enable rational design of improved grafts, and ensure safe and robust clinical translation.
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22
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Knight JH, Sarvestani AL, Ibezim C, Turk E, McCracken CE, Alsoufi B, St Louis J, Moller JH, Raghuveer G, Kochilas LK. Multicentre comparative analysis of long-term outcomes after aortic valve replacement in children. Heart 2021; 108:940-947. [PMID: 34611043 DOI: 10.1136/heartjnl-2021-319597] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 09/09/2021] [Indexed: 01/10/2023] Open
Abstract
OBJECTIVE The ideal valve substitute for surgical intervention of congenital aortic valve disease in children remains unclear. Data on outcomes beyond 10-15 years after valve replacement are limited but important for evaluating substitute longevity. We aimed to describe up to 25-year death/cardiac transplant by type of valve substitute and assess the potential impact of treatment centre. Our hypothesis was that patients with pulmonic valve autograft would have better survival than mechanical prosthetic. METHODS This is a retrospective cohort study from the Pediatric Cardiac Care Consortium, a multi-institutional US-based registry of paediatric cardiac interventions, linked with the National Death Index and United Network for Organ Sharing through 2019. Children (0-20 years old) receiving aortic valve replacement (AVR) from 1982 to 2003 were identified. Kaplan-Meier transplant-free survival was calculated, and Cox proportional hazard models estimated hazard ratios for mechanical AVR (M-AVR) versus pulmonic valve autograft. RESULTS Among 911 children, the median age at AVR was 13.4 years (IQR=8.4-16.5) and 73% were male. There were 10 cardiac transplants and 153 deaths, 5 after transplant. The 25-year transplant-free survival post AVR was 87.1% for autograft vs 76.2% for M-AVR and 72.0% for tissue (bioprosthetic or homograft). After adjustment, M-AVR remained related to increased mortality/transplant versus autograft (HR=1.9, 95% CI=1.1 to 3.4). Surprisingly, survival for patients with M-AVR, but not autograft, was lower for those treated in centres with higher in-hospital mortality. CONCLUSION Pulmonic valve autograft provides the best long-term outcomes for children with aortic valve disease, but AVR results may depend on a centre's experience or patient selection.
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Affiliation(s)
- Jessica H Knight
- Department of Epidemiology and Biostatistics, University of Georgia, Athens, Georgia, USA
| | - Amber Leila Sarvestani
- Department of Pediatrics, University of Missouri-Kansas City School of Medicine, Kansas City, Missouri, USA
| | - Chizitam Ibezim
- Department of Pediatrics, University of Missouri-Kansas City School of Medicine, Kansas City, Missouri, USA
| | - Elizabeth Turk
- Department of Pediatrics, University of Missouri-Kansas City School of Medicine, Kansas City, Missouri, USA
| | - Courtney E McCracken
- Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Bahaaldin Alsoufi
- Department of Surgery, University of Louisville, Louisville, Kentucky, USA
| | - James St Louis
- Department of Surgery, Augusta University Medical College of Georgia, Augusta, Georgia, USA
| | - James H Moller
- School of Medicine, University of Minnesota, Minneapolis, Minnesota, USA
| | - Geetha Raghuveer
- Department of Pediatrics, University of Missouri-Kansas City School of Medicine, Kansas City, Missouri, USA
| | - Lazaros K Kochilas
- Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia, USA.,Sibley Heart Center, Children's Healthcare of Atlanta, Atlanta, Georgia, USA
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Hage A, Hage F, Valdis M, Guo L, Chu MWA. The Ross procedure is the optimal solution for young adults with unrepairable aortic valve disease. Ann Cardiothorac Surg 2021; 10:454-462. [PMID: 34422557 DOI: 10.21037/acs-2021-rp-26] [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: 01/30/2021] [Accepted: 05/05/2021] [Indexed: 11/06/2022]
Abstract
While aortic valve repair remains the ideal intervention to restore normal valvular function, the optimal aortic valve substitute for patients with a non-repairable aortic valve remains an ongoing subject for debate. In particular, younger patients with a non-repairable valve represent a unique challenge because of their active lifestyle and long life expectancy, which carries a higher cumulative risk of prosthesis-related complications. The Ross procedure, unlike prosthetic or homograft aortic valve replacement (AVR), provides an expected survival equivalent to that of the age and gender-matched general population. Contemporary data has shown that the Ross procedure can be performed safely in centers with expertise, and is associated with improved valvular durability, hemodynamics and quality of life.
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Affiliation(s)
- Ali Hage
- Division of Cardiac Surgery, Department of Surgery, Western University, London Health Sciences Centre, London, ON, Canada
| | - Fadi Hage
- Division of Cardiac Surgery, Department of Surgery, Western University, London Health Sciences Centre, London, ON, Canada
| | - Matthew Valdis
- Division of Cardiac Surgery, Department of Surgery, Western University, London Health Sciences Centre, London, ON, Canada
| | - Linrui Guo
- Division of Cardiac Surgery, Department of Surgery, Western University, London Health Sciences Centre, London, ON, Canada
| | - Michael W A Chu
- Division of Cardiac Surgery, Department of Surgery, Western University, London Health Sciences Centre, London, ON, Canada
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Yacoub MH, Hosny H, Afifi A, Nagy M, Mahgoub A, Simry W, AbouZeina MG, Doss R, El Sawy A, Shehata N, Elafifi A, Abdullah H, Romeih S. Novel concepts and early results of repairing common arterial trunk. Eur J Cardiothorac Surg 2021; 61:562-571. [PMID: 34347066 PMCID: PMC8922708 DOI: 10.1093/ejcts/ezab336] [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] [Received: 03/15/2021] [Revised: 06/14/2021] [Accepted: 06/21/2021] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES Common Arterial Trunk (CAT) continues to have a very poor prognosis globally. To address that, we have developed a novel technique targeting key concepts for the correction of all components of the anomaly, using autologous arterial tissue. This aims to enhance results, availability worldwide, and importantly to avoid the need for repeated reoperations. METHODS From January 2019 to 4 January 2021, all patients with isolated CAT had repair of the defect using autologous arterial trunk tissue with direct right ventricle (RV) to pulmonary artery (PA) connection. Clinical outcomes, follow-up which included multi-slice computed tomography 3D segmentation and 4D cardiovascular magnetic resonance flow, are presented. RESULTS Twenty patients were included in the study (median age 4.5 months). There were 2 hospital deaths due to systemic infection and pulmonary hypertensive crisis, respectively. Following discharge all patients remained asymptomatic with no signs of heart failure and improved pattern of growth (median follow-up: 8 months). Early postoperative 3D segmentation showed a conical shaped neo-right ventricular outflow chamber connecting the body of the RV to the main PA through a valveless ostium, and normal crossing of PA and neo-aorta. 4D cardiovascular magnetic resonance pattern of flow showed normal rapid laminar flow through the atrioventricular valves followed by a vortex towards the outflow tracts. There was laminar flow through the neo-aorta and neo-PA with velocity not exceeding 2.5 m/s. The PA regurgitant fraction was 25 ± 5% and was limited to early diastole. CONCLUSIONS The initial results of utilizing the key concepts, using autologous arterial tissue for the repair of CAT, are encouraging, both clinically and by multimodality imaging.
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Affiliation(s)
- Magdi H Yacoub
- Cardiac Surgery Department, Aswan Heart Centre, Aswan, Egypt.,National Heart and Lung Institute, Imperial College London, London, UK
| | - Hatem Hosny
- Cardiac Surgery Department, Aswan Heart Centre, Aswan, Egypt
| | - Ahmed Afifi
- Cardiac Surgery Department, Aswan Heart Centre, Aswan, Egypt.,Cardiac Surgery Department, National Heart Institute, Giza, Egypt
| | - Mohamed Nagy
- Biomedical Engineering and Innovation Laboratory, Aswan Heart Centre, Aswan, Egypt
| | - Ahmed Mahgoub
- Cardiac Surgery Department, Aswan Heart Centre, Aswan, Egypt
| | - Walid Simry
- Cardiac Surgery Department, Aswan Heart Centre, Aswan, Egypt.,Cardiac Surgery Department, National Heart Institute, Giza, Egypt
| | | | - Ramy Doss
- Internal Medicine Department, Baylor University Medical Center, Dallas, TX, USA
| | - Amr El Sawy
- Biomedical Engineering and Innovation Laboratory, Aswan Heart Centre, Aswan, Egypt
| | - Nairouz Shehata
- Biomedical Engineering and Innovation Laboratory, Aswan Heart Centre, Aswan, Egypt
| | | | - Hedaia Abdullah
- Pediatric Intensive Care unit, Aswan Heart Centre, Aswan, Egypt
| | - Soha Romeih
- Radiology Department, Aswan Heart Centre, Aswan, Egypt.,Cardiology Department, Tanta University, Tanta, Egypt
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Latif N, Mahgoub A, Nagy M, Sarathchandra P, Yacoub MH. Severe degeneration of a sub-coronary pulmonary autograft in a young adult. Glob Cardiol Sci Pract 2021; 2021:e202114. [PMID: 34285905 PMCID: PMC8272409 DOI: 10.21542/gcsp.2021.14] [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] [Received: 03/02/2021] [Accepted: 05/31/2021] [Indexed: 11/19/2022] Open
Abstract
Background. The pulmonary autograft is currently the best valve substitute in terms of longevity and performance. However, there is no agreement about the optimal method of insertion (sub-coronary position or freestanding root). Objectives. We sought to examine the clinical status, detailed imaging and morphometric changes in an explanted pulmonary autograft 22 years after sub-coronary implantation. Methods. A 30-year-old female underwent pulmonary autograft replacement of a severely stenotic valve at the age of 7 years, after presenting to us with signs of moderate to severe heart failure. She underwent clinical examination, detailed imaging including echocardiographic and CT examination with computerised image analysis. The explanted valve was examined by morphometry. Results. Clinical examination showed signs of heart failure (NYHA III). Trans-thoracic and trans-oesophageal 2D echo showed severe malfunction of both the aortic and pulmonary valves associated with dilatation and hypertrophy of both the right and left ventricles. Surgical correction was performed by replacing both the pulmonary and aortic valves with Medtronic 27mm Freestyle valves. The pulmonary autograft showed degeneration of the trilamellar layering of the leaflets, loss and disorganisation of GAGs, increased collagen with fibrotic overgrowth, and markers of fibrosis, inflammation, and calcification. Post-operative imaging showed good correction of the haemodynamic lesions. Conclusion. The pulmonary autograft implanted into the sub-coronary position presented with adverse remodelling, which was detrimental to the functionality and longevity of the valve. Authorship. NL, AM, MN all contributed equally to this paper.
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Affiliation(s)
- Najma Latif
- Magdi Yacoub Institute, Heart Science Centre, Harefield Hospital, Harefield, Middx UB9 6JH, UK
- National Heart and Lung Institute, Imperial College London, ICTEM Building, London, UK
| | | | | | - Padmini Sarathchandra
- Magdi Yacoub Institute, Heart Science Centre, Harefield Hospital, Harefield, Middx UB9 6JH, UK
| | - Magdi H. Yacoub
- Magdi Yacoub Institute, Heart Science Centre, Harefield Hospital, Harefield, Middx UB9 6JH, UK
- National Heart and Lung Institute, Imperial College London, ICTEM Building, London, UK
- Aswan Heart Centre, Aswan, Egypt
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26
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Yacoub MH, Tsang V, Sarathchandra P, Jensen H, Hughes S, Latif N. Long-term adaptive versus maladaptive remodelling of the pulmonary autograft after the Ross operation. Eur J Cardiothorac Surg 2021; 57:977-985. [PMID: 32129834 DOI: 10.1093/ejcts/ezaa019] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 11/26/2019] [Accepted: 11/29/2019] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES Following the Ross operation, the pulmonary autograft undergoes structural changes (remodelling). We sought to determine the extent, nature and possible determinants of long-term remodelling in the different components of the pulmonary autograft. METHODS Ten pulmonary autografts and 12 normal control valves (6 pulmonary and 6 aortic) were examined by conventional histology, immunocytochemistry and electron microscopy. The structural changes were quantified by morphometry. RESULTS The leaflets from free-standing root replacement valves demonstrated thickening to levels comparable to the normal aortic leaflets, largely due to the addition of a thin layer of 'neointima' formed of radial elastic fibres, collagen bundles and glycoaminoglycans, on the ventricular aspect of the leaflets. The leaflets of valves from sub-coronary implantation demonstrated a significantly thicker fibroelastic layer on the ventricularis and calcium deposition in the fibrosa. The media of the explanted valves showed increased number of lamellar units to levels comparable to normal aortic roots. Electron microscopy of valves inserted as free-standing roots showed increased organization into continuous layers. However, intralamellar components showed varying degrees of 'disorganization' in comparison to those in the normal aortic media. In addition, there was a marked increase in the number of vasa vasorum with thickened arteriolar wall in the outer media and adventitia. CONCLUSIONS Following the Ross operation, in the very long term, all components of the autograft showed varying degrees of remodelling, which was judged to be largely adaptive. Defining the type, determinants and possible functional effects of remodelling could help in understanding and optimizing the results of the Ross operation.
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Affiliation(s)
- Magdi H Yacoub
- Department of Tissue Engineering, Imperial College London and Heart Science Centre, Harefield, Middlesex, UK
| | - Victor Tsang
- Department of Cardiothoracic Surgery, Great Ormond Street Hospital for Children NHS Trust, London, UK
| | - Padmini Sarathchandra
- Department of Tissue Engineering, Imperial College London and Heart Science Centre, Harefield, Middlesex, UK
| | - Hanna Jensen
- Department of Pathology, University College London, London, UK
| | - Sian Hughes
- Department of Pathology, University College London, London, UK
| | - Najma Latif
- Department of Tissue Engineering, Imperial College London and Heart Science Centre, Harefield, Middlesex, UK
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27
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The Choice of Pulmonary Autograft in Aortic Valve Surgery: A State-of-the-Art Primer. BIOMED RESEARCH INTERNATIONAL 2021; 2021:5547342. [PMID: 33937396 PMCID: PMC8060091 DOI: 10.1155/2021/5547342] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 03/31/2021] [Accepted: 04/05/2021] [Indexed: 11/18/2022]
Abstract
The Ross procedure has long been seen as an optimal operation for a select few. The detractors of it highlight the issue of an additional harvesting of the pulmonary artery, subjecting the native PA to systemic pressures and the need for reintervention as reasons to avoid it. However, the PA is a living tissue and capable of adapting and remodeling to growth. We therefore review the current evidence available to discuss the indications, contraindications, harvesting techniques, and modifications in a state-of-the-art narrative review of the PA as an aortic conduit. Due to the lack of substantial well-designed randomized controlled trials (RCTs), we also highlight the areas of need to reiterate the importance of the Ross procedure as part of the surgical armamentarium.
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von Stumm M, Sequeira-Gross T, Petersen J, Naito S, Müller L, Sinning C, Girdauskas E. Narrative review of the contemporary surgical treatment of unicuspid aortic valve disease. Cardiovasc Diagn Ther 2021; 11:503-517. [PMID: 33968629 DOI: 10.21037/cdt-20-814] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Unicuspid aortic valve disease (UAVD) is a frequent and long-lasting challenge for adult congenital heart disease centers. UAVD patients become usually symptomatic in their twenties or thirties and require a surgical treatment plan which should respect their complete lifespan combined with an adequate quality of life. Unfortunately, all current surgical strategies of congenital aortic valve disease bear some important limitations: (I) Aortic valve replacement using bioprosthetic valves is associated with early structural degeneration and leads frequently to re-operations. (II) Mechanical valves are commonly associated with lifelong risk of severe bleeding due to oral anticoagulation. (III) Using a pulmonary autograft (i.e., Ross procedure) for aortic valve replacement is associated with excellent long-term results in non-elderly patients. However, failure of pulmonary autograft or pulmonary homograft may require re-operations. (IV) Aortic valve repair or Ozaki procedure is only performed in a few heart centers worldwide and is associated with a limited reproducibility and early patch degeneration, suture dehiscence or increased risk of endocarditis. In contrast to degenerative tricuspid aortic valve disease, UAVD remains relatively understudied and reports on UAVD treatment are rare and usually limited to retrospective single-center observations. For this review, we searched PubMed for papers in the English language by using the search words unicuspid aortic valve, congenital aortic valve, Ross procedure, Ozaki procedure, aortic valve repair, mechanical/bioprosthetic aortic replacement, homograft. We read the abstracts of relevant titles to confirm their relevance, and the full papers were then extracted. References from extracted papers were checked for additional relevant reports. This review summarizes current surgical treatment strategies for UAVD including aortic valve replacement using bioprosthetic or mechanical valves, homografts, pulmonary autografts (i.e., Ross procedure) and aortic valve repair techniques for UAV. Furthermore, Ozaki procedure will be discussed.
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Affiliation(s)
- Maria von Stumm
- Department of Cardiovascular Surgery, University Heart & Vascular Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Tatjana Sequeira-Gross
- Department of Cardiovascular Surgery, University Heart & Vascular Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Johannes Petersen
- Department of Cardiovascular Surgery, University Heart & Vascular Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Shiho Naito
- Department of Cardiovascular Surgery, University Heart & Vascular Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Lisa Müller
- Department of Cardiovascular Surgery, University Heart & Vascular Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Christoph Sinning
- Department of Cardiology, University Heart & Vascular Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Evaldas Girdauskas
- Department of Cardiovascular Surgery, University Heart & Vascular Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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29
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Vricella LA, El-Zein C, Hibino N, Rausa J, Roberson D, Ilbawi MN. Technical Modifications that Might Improve Long-Term Outcome of the Ross Procedure in Children. Ann Thorac Surg 2021; 112:1997-2004. [PMID: 33794157 DOI: 10.1016/j.athoracsur.2021.03.047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Revised: 03/11/2021] [Accepted: 03/19/2021] [Indexed: 11/29/2022]
Abstract
BACKGROUND Failure of the pulmonary autograft (PVA) following the Ross procedure (RP) has discouraged its widespread use and led to modifications or alternatives to the procedure. We sought to analyze whether certain technical modifications could improve results of the RP in children. METHODS Sixty-nine patients (median age 12 years, range 0.25 to 17.9) underwent the RP between 01/1996 and 12/2018. Concomitant Konno procedure was performed on 20/69 (29%). Prior interventions included balloon valvuloplasty in 30/69 (44%), and/or surgical valvuloplasty in 39/69 (57%). Technical modifications included utilizing the native aortic root for external annuloplasty, implanting the autograft using uniplanar horizontal sutures through the aortic wall, normalizing the sinotubular junction and wrapping the native root remnant around the PVA. RESULTS Operative mortality was 1/69 (1.5%), with no late death. No patient had neoaortic valvar stenosis and 7/68 (10%) had mild regurgitation on discharge echocardiogram. At latest follow-up (median 9.4 years, range 0.4 - 21.3) there was no significant change in the latest follow up Z scores of annulus, sinus or sinotubular junction diameters when compared to those at discharge. Three patients (4.4%) required late autograft replacement, two PVA repair, and two resection of pseudoaneurysm. Actuarial freedom from PVA replacement was 87% at 20 yrs. Freedom from right ventricular outflow tract catheter reintervention or reoperation was 83% and 80% respectively. CONCLUSIONS Technical modifications of the RP used in this cohort might successfully prolong the life of the PVA without compromising its growth, an important advantage in pediatric patients.
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Affiliation(s)
- Luca A Vricella
- The Heart Institute for Children, Advocate Children's Hospital, Oak Lawn, IL; Department of Surgery, University of Chicago Medicine, Oak Lawn, IL.
| | - Chawki El-Zein
- The Heart Institute for Children, Advocate Children's Hospital, Oak Lawn, IL
| | - Narutushi Hibino
- The Heart Institute for Children, Advocate Children's Hospital, Oak Lawn, IL; Department of Surgery, University of Chicago Medicine, Oak Lawn, IL
| | - Jacqueline Rausa
- The Heart Institute for Children, Advocate Children's Hospital, Oak Lawn, IL
| | - David Roberson
- The Heart Institute for Children, Advocate Children's Hospital, Oak Lawn, IL
| | - Michel N Ilbawi
- The Heart Institute for Children, Advocate Children's Hospital, Oak Lawn, IL
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30
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Zilla P, Deutsch M, Bezuidenhout D, Davies NH, Pennel T. Progressive Reinvention or Destination Lost? Half a Century of Cardiovascular Tissue Engineering. Front Cardiovasc Med 2020; 7:159. [PMID: 33033720 PMCID: PMC7509093 DOI: 10.3389/fcvm.2020.00159] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 07/28/2020] [Indexed: 12/19/2022] Open
Abstract
The concept of tissue engineering evolved long before the phrase was forged, driven by the thromboembolic complications associated with the early total artificial heart programs of the 1960s. Yet more than half a century of dedicated research has not fulfilled the promise of successful broad clinical implementation. A historical account outlines reasons for this scientific impasse. For one, there was a disconnect between distinct eras each characterized by different clinical needs and different advocates. Initiated by the pioneers of cardiac surgery attempting to create neointimas on total artificial hearts, tissue engineering became fashionable when vascular surgeons pursued the endothelialisation of vascular grafts in the late 1970s. A decade later, it were cardiac surgeons again who strived to improve the longevity of tissue heart valves, and lastly, cardiologists entered the fray pursuing myocardial regeneration. Each of these disciplines and eras started with immense enthusiasm but were only remotely aware of the preceding efforts. Over the decades, the growing complexity of cellular and molecular biology as well as polymer sciences have led to surgeons gradually being replaced by scientists as the champions of tissue engineering. Together with a widening chasm between clinical purpose, human pathobiology and laboratory-based solutions, clinical implementation increasingly faded away as the singular endpoint of all strategies. Moreover, a loss of insight into the healing of cardiovascular prostheses in humans resulted in the acceptance of misleading animal models compromising the translation from laboratory to clinical reality. This was most evident in vascular graft healing, where the two main impediments to the in-situ generation of functional tissue in humans remained unheeded–the trans-anastomotic outgrowth stoppage of endothelium and the build-up of an impenetrable surface thrombus. To overcome this dead-lock, research focus needs to shift from a biologically possible tissue regeneration response to one that is feasible at the intended site and in the intended host environment of patients. Equipped with an impressive toolbox of modern biomaterials and deep insight into cues for facilitated healing, reconnecting to the “user needs” of patients would bring one of the most exciting concepts of cardiovascular medicine closer to clinical reality.
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Affiliation(s)
- Peter Zilla
- Christiaan Barnard Division for Cardiothoracic Surgery, University of Cape Town, Cape Town, South Africa.,Cardiovascular Research Unit, University of Cape Town, Cape Town, South Africa
| | - Manfred Deutsch
- Karl Landsteiner Institute for Cardiovascular Surgical Research, Vienna, Austria
| | - Deon Bezuidenhout
- Cardiovascular Research Unit, University of Cape Town, Cape Town, South Africa
| | - Neil H Davies
- Cardiovascular Research Unit, University of Cape Town, Cape Town, South Africa
| | - Tim Pennel
- Christiaan Barnard Division for Cardiothoracic Surgery, University of Cape Town, Cape Town, South Africa
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31
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Nappi F, Spadaccio C, Acar C, El-Hamamsy I. Lights and Shadows on the Ross Procedure: Biological Solutions for Biological Problems. Semin Thorac Cardiovasc Surg 2020; 32:815-822. [PMID: 32439545 DOI: 10.1053/j.semtcvs.2020.04.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Accepted: 04/20/2020] [Indexed: 11/11/2022]
Abstract
The Ross procedure represents a valid option for aortic valve replacement in young adults and was repeatedly shown to restore survival to that of the age- and sex-matched general population. However, its major drawback relies in the risk of pulmonary autograft (PA) dilation, negative histological remodeling and need for reoperation. Several techniques and materials to reinforce the PA have been proposed. They mainly include Dacron, personalized external aortic root support with a polyethylene terephthalate mesh system, autologous aortic tissue and bioresorbable materials. Synthetic materials, despite widely used in cardiac surgery, have significant biocompatibility issues with the PA and their interaction with this living structure translates into negative remodeling phenomena and disadvantageous biomechanical behaviors. Conversely, biomaterials with tailored degradable profiles might be able to reinforce while integrating with the PA and enhance its remodeling capabilities. The recent advancement in this field are here discussed.
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Affiliation(s)
- Francesco Nappi
- Department of Cardiac Surgery Center, Cardiologique du Nord de Saint-Denis, Paris, France.
| | - Cristiano Spadaccio
- Department of Cardiothoracic Surgery, Golden Jubilee National Hospital, Glasgow, United Kingdom; Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, United Kingdom
| | - Christophe Acar
- Department of Cardiovascular Surgery, Hopital de la Salpetriere, Paris, France
| | - Ismail El-Hamamsy
- Department of Cardiac Surgery, Montreal Heart Institute, Montreal, Canada
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33
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Chiarini A, Dal Prà I, Faggian G, Armato U, Luciani GB. Maladaptive remodeling of pulmonary artery root autografts after Ross procedure: A proteomic study. J Thorac Cardiovasc Surg 2020; 159:621-632.e3. [DOI: 10.1016/j.jtcvs.2019.07.083] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 06/26/2019] [Accepted: 07/02/2019] [Indexed: 12/15/2022]
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34
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Von Stumm M, Petersen J, Westermann D, Reichenspurner H, Girdauskas E. Treatment strategies for mixed aortic valve disease in nonelderly patients. Expert Rev Cardiovasc Ther 2019; 17:873-882. [DOI: 10.1080/14779072.2019.1702520] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Maria Von Stumm
- Department of Cardiovascular Surgery, University Heart Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - J. Petersen
- Department of Cardiovascular Surgery, University Heart Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - D. Westermann
- Department of Cardiology, University Heart Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Hermann Reichenspurner
- Department of Cardiovascular Surgery, University Heart Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Evaldas Girdauskas
- Department of Cardiovascular Surgery, University Heart Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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35
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Li RL, Russ J, Paschalides C, Ferrari G, Waisman H, Kysar JW, Kalfa D. Mechanical considerations for polymeric heart valve development: Biomechanics, materials, design and manufacturing. Biomaterials 2019; 225:119493. [PMID: 31569017 PMCID: PMC6948849 DOI: 10.1016/j.biomaterials.2019.119493] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 08/21/2019] [Accepted: 09/11/2019] [Indexed: 01/12/2023]
Abstract
The native human heart valve leaflet contains a layered microstructure comprising a hierarchical arrangement of collagen, elastin, proteoglycans and various cell types. Here, we review the various experimental methods that have been employed to probe this intricate microstructure and which attempt to elucidate the mechanisms that govern the leaflet's mechanical properties. These methods include uniaxial, biaxial, and flexural tests, coupled with microstructural characterization techniques such as small angle X-ray scattering (SAXS), small angle light scattering (SALS), and polarized light microscopy. These experiments have revealed complex elastic and viscoelastic mechanisms that are highly directional and dependent upon loading conditions and biochemistry. Of all engineering materials, polymers and polymer-based composites are best able to mimic the tissue-level mechanical behavior of the native leaflet. This similarity to native tissue permits the fabrication of polymeric valves with physiological flow patterns, reducing the risk of thrombosis compared to mechanical valves and in some cases surpassing the in vivo durability of bioprosthetic valves. Earlier work on polymeric valves simply assumed the mechanical properties of the polymer material to be linear elastic, while more recent studies have considered the full hyperelastic stress-strain response. These material models have been incorporated into computational models for the optimization of valve geometry, with the goal of minimizing internal stresses and improving durability. The latter portion of this review recounts these developments in polymeric heart valves, with a focus on mechanical testing of polymers, valve geometry, and manufacturing methods.
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Affiliation(s)
- Richard L Li
- Department of Mechanical Engineering, Fu Foundation School of Engineering and Applied Science, Columbia University, New York, NY, USA; Division of Cardiac, Thoracic and Vascular Surgery, Section of Pediatric and Congenital Cardiac Surgery, New-York Presbyterian - Morgan Stanley Children's Hospital, Columbia University Medical Center, New York, NY, USA
| | - Jonathan Russ
- Department of Civil Engineering and Engineering Mechanics, Fu Foundation School of Engineering and Applied Science, Columbia University, New York, NY, USA
| | - Costas Paschalides
- Department of Mechanical Engineering, Fu Foundation School of Engineering and Applied Science, Columbia University, New York, NY, USA
| | - Giovanni Ferrari
- Department of Surgery and Biomedical Engineering, Columbia University Medical Center, New York, NY, USA
| | - Haim Waisman
- Department of Civil Engineering and Engineering Mechanics, Fu Foundation School of Engineering and Applied Science, Columbia University, New York, NY, USA
| | - Jeffrey W Kysar
- Department of Mechanical Engineering, Fu Foundation School of Engineering and Applied Science, Columbia University, New York, NY, USA; Department of Otolaryngology - Head and Neck Surgery, Columbia University Medical Center, New York, NY, USA.
| | - David Kalfa
- Division of Cardiac, Thoracic and Vascular Surgery, Section of Pediatric and Congenital Cardiac Surgery, New-York Presbyterian - Morgan Stanley Children's Hospital, Columbia University Medical Center, New York, NY, USA.
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Chauvette V, Chamberland MÈ, El-Hamamsy I. A review of pulmonary autograft external support in the Ross procedure. Expert Rev Med Devices 2019; 16:981-988. [PMID: 31663385 DOI: 10.1080/17434440.2019.1685380] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Introduction: Although the Ross procedure offers several advantages over standard prosthetic AVR, its use remains limited. The risk of pulmonary autograft dilatation requiring reintervention remains one of the main concerns. Consequently, multiple techniques have been developed in attempt to mitigate this complication.Areas covered: This article reviews the incidence of pulmonary autograft dilatation, its risk factors and pathophysiology. The techniques of external pulmonary autograft support are discussed along with their respective advantages and limitations. Finally, future areas of research and developments are examined.Expert opinion: The risk of autograft dilatation is mainly prevalent in patients with aortic regurgitation and a dilated aortic annulus. In these selected patients, an external support may prevent dilatation of the autograft. However, any permanent support potentially restricts autograft root motion, mitigating some of the advantages associated with the Ross procedure. A bioresorbable matrix that could support the root during its initial adaptative phase could alleviate this problem. In our opinion, aggressive blood pressure control during the first postoperative year along with annular and sino-tubular junction support in selected patients provides optimal stability of autograft root dimensions while preserving root dynamics. Serial imaging and clinical follow-up are necessary to define the role of these various strategies.
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Affiliation(s)
- Vincent Chauvette
- Department of Cardiac Surgery, Montreal Heart Institute, Montreal, Canada
| | | | - Ismail El-Hamamsy
- Department of Cardiac Surgery, Montreal Heart Institute, Montreal, Canada
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37
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Mazine A, Rocha RV, El-Hamamsy I, Ouzounian M, Yanagawa B, Bhatt DL, Verma S, Friedrich JO. Ross Procedure vs Mechanical Aortic Valve Replacement in Adults: A Systematic Review and Meta-analysis. JAMA Cardiol 2019; 3:978-987. [PMID: 30326489 DOI: 10.1001/jamacardio.2018.2946] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Importance The ideal aortic valve substitute in young and middle-aged adults remains unknown. Objective To compare long-term outcomes between the Ross procedure and mechanical aortic valve replacement in adults. Data Sources The Ovid versions of MEDLINE and EMBASE classic (January 1, 1967, to April 26, 2018; search performed on April 27, 2018) were screened for relevant studies using the following text word search in the title or abstract: ("Ross" OR "autograft") AND ("aortic" OR "mechanical"). Study Selection All randomized clinical trials and observational studies comparing the Ross procedure to the use of mechanical prostheses in adults undergoing aortic valve replacement were included. Studies were included if they reported any of the prespecified primary or secondary outcomes. Studies were excluded if no clinical outcomes were reported or if data were published only as an abstract. Citations were screened in duplicate by 2 of the authors, and disagreements regarding inclusion were reconciled via consensus. Data Extraction and Synthesis This meta-analysis was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses and Meta-analysis of Observational Studies in Epidemiology guidelines. Data were independently abstracted by 3 reviewers and pooled using a random-effects model. Main Outcomes and Measures The prespecified primary outcome was all-cause mortality. Results The search identified 2919 reports, of which 18 studies (3516 patients) met inclusion criteria, including 1 randomized clinical trial and 17 observational studies, with a median average follow-up of 5.8 (interquartile range, 3.4-9.2) years. Analysis of the primary outcome showed a 46% lower all-cause mortality in patients undergoing the Ross procedure compared with mechanical aortic valve replacement (incidence rate ratio [IRR], 0.54; 95% CI, 0.35-0.82; P = .004; I2 = 28%). The Ross procedure was also associated with lower rates of stroke (IRR, 0.26; 95% CI, 0.09-0.80; P = .02; I2 = 8%) and major bleeding (IRR, 0.17; 95% CI, 0.07-0.40; P < .001; I2 = 0%) but higher rates of reintervention (IRR, 1.76; 95% CI, 1.16-2.65; P = .007; I2 = 0%). Conclusions and Relevance Data from primarily observational studies suggest that the Ross procedure is associated with lower all-cause mortality compared with mechanical aortic valve replacement. These findings highlight the need for a large, prospective randomized clinical trial comparing long-term outcomes between these 2 interventions.
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Affiliation(s)
- Amine Mazine
- Division of Cardiac Surgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Rodolfo V Rocha
- Division of Cardiac Surgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Ismail El-Hamamsy
- Department of Cardiac Surgery, Montreal Heart Institute, Montreal, Quebec, Canada
| | - Maral Ouzounian
- Department of Cardiac Surgery, Toronto General Hospital, Toronto, Ontario, Canada
| | - Bobby Yanagawa
- Department of Cardiac Surgery, St Michael's Hospital, Toronto, Ontario, Canada
| | - Deepak L Bhatt
- Brigham and Women's Hospital Heart & Vascular Center, Harvard Medical School, Boston, Massachusetts
| | - Subodh Verma
- Department of Cardiac Surgery, St Michael's Hospital, Toronto, Ontario, Canada
| | - Jan O Friedrich
- Department of Critical Care Medicine, St Michael's Hospital, Toronto, Ontario, Canada
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Pradegan N, Castaldi B, Azzolina D, Stellin G, Vida VL. Long-Term Fate of the Neoaortic Root After Neonatal Ross Operation: A Case Series. World J Pediatr Congenit Heart Surg 2019; 10:364-366. [PMID: 31084313 DOI: 10.1177/2150135119840023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The aim of this study is to analyze the adaptation properties of the pulmonary autograft in four infants who underwent the Ross operation before one year of life. The patients underwent serial echocardiographic assessments of the autograft diameters at short- and long-term follow-up and values were reported as the Z scores for normal aortic and pulmonary diameters. At a median follow-up time of 18.5 years (range: 18.2-19.4 years), all the patients are alive, none requiring autograft reinterventions. This series shows excellent adaptation potential of the "infant pulmonary autograph" in the long-term, during somatic growth of the patient.
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Affiliation(s)
- Nicola Pradegan
- 1 Pediatric and Congenital Cardiac Surgery Unit, Department of Cardiac, Thoracic, Vascular Sciences and Public Health, University of Padua, Padua, Italy
| | - Biagio Castaldi
- 2 Pediatric Cardiology Unit, Department of Women's and Children's Health, University of Padua, Padua, Italy
| | - Danila Azzolina
- 3 Biostatistics Unit, Department of Cardiac, Thoracic, Vascular Sciences and Public Health, University of Padua, Padua, Italy
| | - Giovanni Stellin
- 1 Pediatric and Congenital Cardiac Surgery Unit, Department of Cardiac, Thoracic, Vascular Sciences and Public Health, University of Padua, Padua, Italy
| | - Vladimiro L Vida
- 1 Pediatric and Congenital Cardiac Surgery Unit, Department of Cardiac, Thoracic, Vascular Sciences and Public Health, University of Padua, Padua, Italy
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Bouhout I, El-Hamamsy I. The Prospective Randomized On-X Valve Anticoagulation Clinical Trial (PROACT): Lower is better, but is it good enough? Glob Cardiol Sci Pract 2019; 2019:2. [PMID: 31024944 PMCID: PMC6472691 DOI: 10.21542/gcsp.2019.2] [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] [Indexed: 11/24/2022] Open
Abstract
Due to their durability, mechanical prostheses are frequently used for aortic valve replacement (AVR) in young adults. However, these valves are thrombogenic and require lifelong anticoagulation. Over the last few decades, efforts have been made towards the lowering of INR targets in an effort to reduce bleeding events without influencing the thromboembolic risk. The Prospective Randomized On-X Valve Anticoagulation Clinical Trial (PROACT) was designed to compare standard versus low anticoagulation targets in high-risk patients undergoing mechanical AVR with the ON-X prosthesis.
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Affiliation(s)
- Ismail Bouhout
- Department of Cardiac Surgery, Montreal Heart Institute, Université de Montreal, Quebec, Canada
| | - Ismail El-Hamamsy
- Department of Cardiac Surgery, Montreal Heart Institute, Université de Montreal, Quebec, Canada
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Mazine A, El-Hamamsy I, Verma S, Peterson MD, Bonow RO, Yacoub MH, David TE, Bhatt DL. Ross Procedure in Adults for Cardiologists and Cardiac Surgeons. J Am Coll Cardiol 2018; 72:2761-2777. [DOI: 10.1016/j.jacc.2018.08.2200] [Citation(s) in RCA: 92] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Accepted: 08/19/2018] [Indexed: 01/07/2023]
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Dekker S, van Geemen D, van den Bogaerdt AJ, Driessen-Mol A, Aikawa E, Smits AIPM. Sheep-Specific Immunohistochemical Panel for the Evaluation of Regenerative and Inflammatory Processes in Tissue-Engineered Heart Valves. Front Cardiovasc Med 2018; 5:105. [PMID: 30159315 PMCID: PMC6104173 DOI: 10.3389/fcvm.2018.00105] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2018] [Accepted: 07/13/2018] [Indexed: 12/27/2022] Open
Abstract
The creation of living heart valve replacements via tissue engineering is actively being pursued by many research groups. Numerous strategies have been described, aimed either at culturing autologous living valves in a bioreactor (in vitro) or inducing endogenous regeneration by the host via resorbable scaffolds (in situ). Whereas a lot of effort is being invested in the optimization of heart valve scaffold parameters and culturing conditions, the pathophysiological in vivo remodeling processes to which tissue-engineered heart valves are subjected upon implantation have been largely under-investigated. This is partly due to the unavailability of suitable immunohistochemical tools specific to sheep, which serves as the gold standard animal model in translational research on heart valve replacements. Therefore, the goal of this study was to comprise and validate a comprehensive sheep-specific panel of antibodies for the immunohistochemical analysis of tissue-engineered heart valve explants. For the selection of our panel we took inspiration from previous histopathological studies describing the morphology, extracellular matrix composition and cellular composition of native human heart valves throughout development and adult stages. Moreover, we included a range of immunological markers, which are particularly relevant to assess the host inflammatory response evoked by the implanted heart valve. The markers specifically identifying extracellular matrix components and cell phenotypes were tested on formalin-fixed paraffin-embedded sections of native sheep aortic valves. Markers for inflammation and apoptosis were tested on ovine spleen and kidney tissues. Taken together, this panel of antibodies could serve as a tool to study the spatiotemporal expression of proteins in remodeling tissue-engineered heart valves after implantation in a sheep model, thereby contributing to our understanding of the in vivo processes which ultimately determine long-term success or failure of tissue-engineered heart valves.
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Affiliation(s)
- Sylvia Dekker
- Soft Tissue Engineering & Mechanobiology Division, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands
| | - Daphne van Geemen
- Soft Tissue Engineering & Mechanobiology Division, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands
| | | | - Anita Driessen-Mol
- Soft Tissue Engineering & Mechanobiology Division, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands
- Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, Netherlands
| | - Elena Aikawa
- Division of Cardiovascular Medicine, Department of Medicine, Center for Excellence in Cardiovascular Medicine, Brigham and Women's Hospital, Boston, MA, United States
| | - Anthal I. P. M. Smits
- Soft Tissue Engineering & Mechanobiology Division, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands
- Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, Netherlands
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Plazyo O, Liu R, Moazzem Hossain M, Jin JP. Deletion of calponin 2 attenuates the development of calcific aortic valve disease in ApoE -/- mice. J Mol Cell Cardiol 2018; 121:233-241. [PMID: 30053524 DOI: 10.1016/j.yjmcc.2018.07.249] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 07/21/2018] [Accepted: 07/23/2018] [Indexed: 12/13/2022]
Abstract
Calcific aortic valve disease (CAVD) is a leading cause of cardiovascular mortality and lacks non-surgical treatment. The pathogenesis of CAVD involves perturbation of valvular cells by mechanical stimuli, including shear stress, pressure load and leaflet stretch, of which the molecular mechanism requires further elucidation. We recently demonstrated that knockout (KO) of Cnn2 gene that encodes calponin isoform 2, a mechanoregulated cytoskeleton protein, attenuates atherosclerosis in ApoE KO mice. Here we report that Cnn2 KO also decreased calcification of the aortic valve in ApoE KO mice, an established model of CAVD. Although myeloid cell-specific Cnn2 KO highly effectively attenuated vascular atherosclerosis that shares many pathogenic processes with CAVD, it did not reduce aortic valve calcification in ApoE KO mice. Indicating a function in the pathogenesis of CAVD, calponin 2 participates in myofibroblast differentiation that is a leading step in the development of CAVD. The aortic valves of ApoE KO mice exhibited increased expression of calponin 2 and smooth muscle actin (SMA), a hallmark of myofibroblasts. The expression of calponin 2 increased during myofibroblast-like differentiation of primary sheep aortic valve interstitial cells and during the osteogenic differentiation of mouse myofibroblasts. Cnn2 KO attenuated TGFβ1-induced differentiation of myofibroblasts in culture as shown by the lower expression of SMA and less calcification than that of wild type (WT) cells. These findings present calponin 2 as a novel molecular target for the treatment and prevention of CAVD.
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Affiliation(s)
- Olesya Plazyo
- Department of Physiology, Wayne State University School of Medicine, 540 E. Canfield, Detroit, MI 48201, USA
| | - Rong Liu
- Department of Physiology, Wayne State University School of Medicine, 540 E. Canfield, Detroit, MI 48201, USA
| | - M Moazzem Hossain
- Department of Physiology, Wayne State University School of Medicine, 540 E. Canfield, Detroit, MI 48201, USA
| | - J-P Jin
- Department of Physiology, Wayne State University School of Medicine, 540 E. Canfield, Detroit, MI 48201, USA.
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Mayer JE. Invited Commentary. Ann Thorac Surg 2017; 105:1213-1214. [PMID: 29277673 DOI: 10.1016/j.athoracsur.2017.12.002] [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: 11/30/2017] [Accepted: 12/06/2017] [Indexed: 10/18/2022]
Affiliation(s)
- John E Mayer
- Boston Children's Hospital, Department of Cardiovascular Surgery, Children's Hospital-Bader 273, 300 Longwood Ave, Boston, MA 02115.
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Stephens EH, Han J, Trawick EA, Di Martino ES, Akkiraju H, Brown LM, Connell JP, Grande-Allen KJ, Vunjak-Novakovic G, Takayama H. Left-Ventricular Assist Device Impact on Aortic Valve Mechanics, Proteomics and Ultrastructure. Ann Thorac Surg 2017; 105:572-580. [PMID: 29223417 DOI: 10.1016/j.athoracsur.2017.08.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Revised: 06/24/2017] [Accepted: 08/07/2017] [Indexed: 12/23/2022]
Abstract
BACKGROUND Aortic regurgitation is a prevalent, detrimental complication of left ventricular assist devices (LVADs). The altered hemodynamics of LVADs results in aortic valves (AVs) having distinct mechanical stimulation. Our hypothesis was that the altered AV hemodynamics modulates the valve cells and matrix, resulting in changes in valvular mechanical properties that then can lead to regurgitation. METHODS AVs were collected from 16 LVAD and 6 non-LVAD patients at time of heart transplant. Standard demographic and preoperative data were collected and comparisons between the two groups were calculated using standard statistical methods. Samples were analyzed using biaxial mechanical tensile testing, mass spectrometry-based proteomics, and transmission electron microscopy to assess ultrastructure. RESULTS The maximum circumferential leaflet strain in LVAD patients was less than in non-LVAD patients (0.35 ± 0.10MPa versus 0.52 ± 0.18 MPa, p = 0.03) with a trend of reduced radial strain (p = 0.06) and a tendency for the radial strain to decrease with increasing LVAD duration (p = 0.063). Numerous proteins associated with actin and myosin, immune signaling and oxidative stress, and transforming growth factor β were increased in LVAD patients. Ultrastructural analysis showed a trend of increased fiber diameter in LVAD patients (46.2 ± 7.2 nm versus 45.1 ± 6.9 nm, p = 0.10), but no difference in fiber density. CONCLUSIONS AVs in LVAD patients showed decreased compliance and increased expression of numerous proteins related to valve activation and injury compared to non-LVAD patients. Further knowledge of AV changes leading to regurgitation in LVAD patients and the pathways by which they occur may provide an opportunity for interventions to prevent and/or reverse this detrimental complication.
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Affiliation(s)
- Elizabeth H Stephens
- Division of Cardiac, Thoracic and Vascular Surgery, Columbia University Medical Center, New York, New York.
| | - Jiho Han
- Division of Cardiac, Thoracic and Vascular Surgery, Columbia University Medical Center, New York, New York
| | - Emma A Trawick
- Department of Biomedical Engineering, Columbia University, New York, New York
| | - Elena S Di Martino
- Schulich School of Engineering and Libin Cardiovascular Institute, University of Calgary, Calgary, Alberta, Canada
| | - Hemanth Akkiraju
- Quantitative Proteomics and Metabolomics Center and Department of Biological Sciences, Columbia University, New York, New York
| | - Lewis M Brown
- Quantitative Proteomics and Metabolomics Center and Department of Biological Sciences, Columbia University, New York, New York
| | | | | | - Gordana Vunjak-Novakovic
- Department of Biomedical Engineering, Columbia University, New York, New York; Department of Medicine, Columbia University Medical Center, New York, New York
| | - Hiroo Takayama
- Division of Cardiac, Thoracic and Vascular Surgery, Columbia University Medical Center, New York, New York
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Mookhoek A, Krishnan K, Chitsaz S, Kuang H, Ge L, Schoof PH, Bogers AJ, Takkenberg JJ, Tseng EE. Biomechanics of Failed Pulmonary Autografts Compared to Native Aortic Roots. Ann Thorac Surg 2017; 103:1482-1488. [DOI: 10.1016/j.athoracsur.2016.08.061] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2015] [Revised: 08/08/2016] [Accepted: 08/15/2016] [Indexed: 11/29/2022]
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Tran PK, Tsang VT, Cornejo PR, Torii R, Dominguez T, Tran-Lundmark K, Hsia TY, Hughes M, Muthialu N, Kostolny M. Midterm results of the Ross procedure in children: an appraisal of the subannular implantation with interrupted sutures technique†. Eur J Cardiothorac Surg 2017; 52:798-804. [DOI: 10.1093/ejcts/ezx113] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Accepted: 02/26/2017] [Indexed: 12/30/2022] Open
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Cirka HA, Uribe J, Liang V, Schoen FJ, Billiar KL. Reproducible in vitro model for dystrophic calcification of cardiac valvular interstitial cells: insights into the mechanisms of calcific aortic valvular disease. LAB ON A CHIP 2017; 17:814-829. [PMID: 28128382 DOI: 10.1039/c6lc01226d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Calcific aortic valvular disease (CAVD) is the most prevalent valvular pathology in the United States. Development of a pharmacologic agent to slow, halt, or reverse calcification has proven to be unsuccessful as still much remains unknown about the mechanisms of disease initiation. Although in vitro models of some features of CAVD exist, their utility is limited by the inconsistency of the size and time course of the calcified cell aggregates. In this study, we introduce and verify a highly reproducible in vitro method for studying dystrophic calcification of cardiac valvular interstitial cells, considered to be a key mechanism of clinical CAVD. By utilizing micro-contact printing, we were able to consistently reproduce cell aggregation, myofibroblastic markers, programmed cell death, and calcium accumulation within aggregates of 50-400 μm in diameter on substrates with moduli from 9.6 to 76.8 kPa. This method is highly repeatable, with 70% of aggregates staining positive for Alizarin Red S after one week in culture. Dense mineralized calcium-positive nanoparticles were found within the valvular interstitial cell aggregates as shown by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The area of micro-contact printed aggregates staining positive for caspase 3/7 activity increased from 5.9 ± 0.9% to 12.6 ± 4.5% over one week in culture. Z-VAD-FMK reduced aggregates staining positive for Alizarin Red S by 60%. The state of cell stress is hypothesized to play a role in the disease progression; traction force microscopy indicates high substrate stresses along the aggregate periphery which can be modulated by altering the size of the aggregates and the modulus of the substrate. Micro-contact printing is advantageous over the currently used in vitro model as it allows the independent study of how cytokines, substrate modulus, and pharmacologic agents affect calcification. This controlled method for aggregate creation has the potential to be used as an in vitro assay for the screening of promising therapeutics to mitigate CAVD.
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Affiliation(s)
- Heather A Cirka
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA 01609, USA.
| | - Johana Uribe
- Department of Bioengineering, University of Massachusetts at Dartmouth, Dartmouth, MA 02714, USA
| | - Vivian Liang
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA 01609, USA.
| | - Frederick J Schoen
- Department of Pathology, Brigham and Women's Hospital, Boston, MA 02115, USA
| | - Kristen L Billiar
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA 01609, USA.
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Mazine A, Ouzounian M. Aortic valve replacement in young and middle-aged adults: looking beyond the tree that hides the forest. ANNALS OF TRANSLATIONAL MEDICINE 2017; 5:92. [PMID: 28275637 DOI: 10.21037/atm.2017.02.06] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Amine Mazine
- Division of Cardiovascular Surgery, Peter Munk Cardiac Centre, Toronto General Hospital and University of Toronto, Toronto, ON, Canada
| | - Maral Ouzounian
- Division of Cardiovascular Surgery, Peter Munk Cardiac Centre, Toronto General Hospital and University of Toronto, Toronto, ON, Canada
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Abstract
The Ross operation provides several advantages compared to other valve substitutes to manage aortic valve disease, such as growth potential, excellent hemodynamics, freedom from oral anticoagulation and hemolysis, and better durability. However, progressive dilatation of the pulmonary autografts after Ross operation reflects the inadequate remodeling of the native pulmonary root in the systemic circulation, which results in impaired adaptability to systemic pressure and risk of reoperation after the first decade. A recently published article showed that remodeling increased wall thickness and decreased stiffness in the failed specimens after Ross operation, and the increased compliance might play a key role in determining the progressive long-term autograft root dilatation. Late dilatation can be counteracted by an external barrier which prevents failure. Therefore, an inclusion cylinder technique with a native aorta or a synthetic external support, such as Dacron, might stabilize the autograft root and improve long-term outcomes. In this article, we offer a prospective about the importance of biomechanical features in future developments of the Ross operation. Pre-clinical and clinical evaluations of the biomechanical properties of these reinforced pulmonary autografts might shed new light on the current debate about the long-term fate of the pulmonary autograft after Ross procedure.
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Affiliation(s)
- Francesco Nappi
- Department of Cardiac Surgery, Centre Cardiologique du Nord de Saint-Denis, Paris, France
| | - Antonio Nenna
- Department of Cardiovascular Surgery, Università Campus Bio-Medico di Roma, Rome, Italy
| | - Cristiano Spadaccio
- Department of Cardiothoracic Surgery, Golden Jubilee National Hospital, Glasgow, UK
| | - Massimo Chello
- Department of Cardiovascular Surgery, Università Campus Bio-Medico di Roma, Rome, Italy
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