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Brener MI, Hamandi M, Hong E, Pizano A, Harloff MT, Garner EF, El Sabbagh A, Kaple RK, Geirsson A, Deaton DW, Islam AM, Veeregandham R, Bapat V, Khalique OK, Ning Y, Kurlansky PA, Grayburn PA, Nazif TM, Kodali SK, Leon MB, Borger MA, Lee R, Kohli K, Yoganathan AP, Colli A, Guerrero ME, Davies JE, Eudailey KW, Kaneko T, Nguyen TC, Russell H, Smith RL, George I. Early outcomes following transatrial transcatheter mitral valve replacement in patients with severe mitral annular calcification. J Thorac Cardiovasc Surg 2024; 167:1263-1275.e3. [PMID: 36153166 DOI: 10.1016/j.jtcvs.2022.07.038] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 06/29/2022] [Accepted: 07/22/2022] [Indexed: 11/19/2022]
Abstract
OBJECTIVE Implantation of a transcatheter valve-in-mitral annular calcification (ViMAC) has emerged as an alternative to traditional surgical mitral valve (MV) replacement. Previous studies evaluating ViMAC aggregated transseptal, transapical, and transatrial forms of the procedure, leaving uncertainty about each technique's advantages and disadvantages. Thus, we sought to evaluate clinical outcomes specifically for transatrial ViMAC from the largest multicenter registry to-date. METHODS Patients with symptomatic MV dysfunction and severe MAC who underwent ViMAC were enrolled from 12 centers across the United States and Europe. Clinical characteristics, procedural details, and clinical outcomes were abstracted from the electronic record. The primary end point was all-cause mortality. RESULTS We analyzed 126 patients who underwent ViMAC (median age 76 years [interquartile range {IQR}, 70-82 years], 28.6% female, median Society of Thoracic Surgeons score 6.8% [IQR, 4.0-11.4], and median follow-up 89 days [IQR, 16-383.5]). Sixty-one (48.4%) had isolated mitral stenosis, 25 (19.8%) had isolated mitral regurgitation (MR), and 40 (31.7%) had mixed MV disease. Technical success was achieved in 119 (94.4%) patients. Thirty (23.8%) patients underwent concurrent septal myectomy, and 8 (6.3%) patients experienced left ventricular outflow tract obstruction (7/8 did not undergo myectomy). Five (4.2%) patients of 118 with postprocedure echocardiograms had greater than mild paravalvular leak. Thirty-day and 1-year all-cause mortality occurred in 16 and 33 patients, respectively. In multivariable models, moderate or greater MR at baseline was associated with increased risk of 1-year mortality (hazard ratio, 2.31; 95% confidence interval, 1.07-4.99, P = .03). CONCLUSIONS Transatrial ViMAC is safe and feasible in this selected, male-predominant cohort. Patients with significant MR may derive less benefit from ViMAC than patients with mitral stenosis only.
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Affiliation(s)
- Michael I Brener
- Division of Cardiology, Columbia University Medical Center, New York, NY
| | - Mohanad Hamandi
- Division of Cardiothoracic Surgery, Baylor Scott and White Health, Plano, Tex
| | - Estee Hong
- Division of Cardiothoracic Surgery, Columbia University Medical Center, New York, NY
| | - Alejandro Pizano
- Division of Cardiothoracic Surgery, University of Texas Health Science Center, Houston, Tex
| | - Morgan T Harloff
- Division of Cardiac Surgery, Brigham and Women's Hospital, Boston, Mass
| | - Evan F Garner
- Division of Cardiothoracic Surgery, University of Alabama-Birmingham, Birmingham, Ala
| | | | - Ryan K Kaple
- Division of Cardiology, Yale University School of Medicine, New Haven, Conn
| | - Arnar Geirsson
- Division of Cardiac Surgery, Yale University School of Medicine, New Haven, Conn
| | - David W Deaton
- Baystate Heart and Vascular Program, Baystate Medical Center, Springfield, Mass
| | - Ashequl M Islam
- Baystate Heart and Vascular Program, Baystate Medical Center, Springfield, Mass
| | | | - Vinayak Bapat
- Division of Cardiothoracic Surgery, Minneapolis Heart Institute Foundation, Minneapolis, Minn
| | - Omar K Khalique
- Division of Cardiology, Columbia University Medical Center, New York, NY
| | - Yuming Ning
- Division of Cardiothoracic Surgery, Columbia University Medical Center, New York, NY
| | - Paul A Kurlansky
- Division of Cardiothoracic Surgery, Columbia University Medical Center, New York, NY
| | - Paul A Grayburn
- Division of Cardiology, Baylor Scott and White Health, Plano, Tex
| | - Tamim M Nazif
- Division of Cardiology, Columbia University Medical Center, New York, NY
| | - Susheel K Kodali
- Division of Cardiology, Columbia University Medical Center, New York, NY
| | - Martin B Leon
- Division of Cardiology, Columbia University Medical Center, New York, NY
| | - Michael A Borger
- Division of Cardiac Surgery, Leipzig Heart Center, Leipzig, Germany
| | - Raymond Lee
- Division of Cardiothoracic Surgery, Keck University of Southern California, Los Angeles, Calif
| | - Keshav Kohli
- Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Ga
| | - Ajit P Yoganathan
- Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Ga
| | - Andrea Colli
- Department of Cardio-Thoracic-Vascular Surgery, University of Pisa, Pisa, Italy
| | - Mayra E Guerrero
- Division of Cardiovascular Medicine, Mayo Clinic Hospital, Rochester, Minn
| | - James E Davies
- Division of Cardiothoracic Surgery, University of Alabama-Birmingham, Birmingham, Ala
| | - Kyle W Eudailey
- Division of Cardiothoracic Surgery, University of Alabama-Birmingham, Birmingham, Ala
| | - Tsuyoshi Kaneko
- Division of Cardiac Surgery, Brigham and Women's Hospital, Boston, Mass
| | - Tom C Nguyen
- Division of Cardiothoracic Surgery, University of California-San Francisco, San Francisco, Calif
| | - Hyde Russell
- Division of Cardiothoracic Surgery, Northshore University HealthSystem, Evanston, Ill
| | - Robert L Smith
- Division of Cardiothoracic Surgery, Baylor Scott and White Health, Plano, Tex
| | - Isaac George
- Division of Cardiothoracic Surgery, Columbia University Medical Center, New York, NY.
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Hill SJ, Young A, Prendergast B, Redwood S, Rajani R, De Vecchi A. Patient-specific fluid simulation of transcatheter mitral valve replacement in mitral annulus calcification. Front Cardiovasc Med 2022; 9:934305. [PMID: 36588546 PMCID: PMC9797989 DOI: 10.3389/fcvm.2022.934305] [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: 05/02/2022] [Accepted: 11/30/2022] [Indexed: 12/23/2022] Open
Abstract
Introduction Transcatheter mitral valve replacement is a promising alternative to open-heart surgery in elderly patients. Patients with severe mitral annulus calcification (MAC) are a particularly high-risk population, where postprocedural complications can have catastrophic effects. Amongst these, obstruction of the left ventricular outflow tract can lead to ventricular hypertrophic remodeling and subsequent heart failure, while subclinical valve thrombosis can result in early bioprosthetic valve failure. Methods To elucidate the mechanisms of left ventricular outflow tract obstruction and valve thrombosis following valve-in-MAC procedures, we used image processing and Computational Fluid Dynamics (CFD) software to generate patient- and device-specific models based on preprocedural CT data. Personalized computer simulations were performed to predict the left ventricular haemodynamics after implantation in three patients with severe MAC. Results The simulations have successfully captured the increased pressure gradient in the left ventricular outflow tract as a result of the partial obstruction due to the implanted valve. Regions of wall shear stress above the threshold value for platelet activation were also observed on the bioprosthetic frame as a result of the reduced outflow tract area, which led to increases in flow resistance and blood residence time inside the ventricle. Consistent with these findings, areas of slow recirculating flow and blood stasis formed near the valve frame, creating potential pro-thrombotic conditions. Discussion This study provides insight into the relationship between size and shape of the outflow tract post-implantation, pressure gradients and pro-thrombotic flow metrics such as wall shear stress and blood residence time. Results show the potential of CFD modeling to bring key functional metrics into preprocedural assessment for a comprehensive evaluation of post-procedural risks beyond anatomical factors. Following further validation and extension to the atrial chamber, this approach can provide an in-depth analysis of the likelihood of valvular thrombosis.
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Affiliation(s)
- Samuel Joseph Hill
- School of Biomedical Engineering and Imaging Sciences, King’s College London, London, United Kingdom
| | - Alistair Young
- School of Biomedical Engineering and Imaging Sciences, King’s College London, London, United Kingdom
| | - Bernard Prendergast
- Cardiovascular Directorate, Guy’s and St Thomas’ NHS Foundation Trust, London, United Kingdom
| | - Simon Redwood
- Cardiovascular Directorate, Guy’s and St Thomas’ NHS Foundation Trust, London, United Kingdom
| | - Ronak Rajani
- School of Biomedical Engineering and Imaging Sciences, King’s College London, London, United Kingdom
| | - Adelaide De Vecchi
- School of Biomedical Engineering and Imaging Sciences, King’s College London, London, United Kingdom
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Kohli K, Wei ZA, Sadri V, Siefert AW, Blanke P, Perdoncin E, Greenbaum AB, Khan JM, Lederman RJ, Babaliaros VC, Yoganathan AP, Oshinski JN. Assessing the Hemodynamic Impact of Anterior Leaflet Laceration in Transcatheter Mitral Valve Replacement: An in silico Study. Front Cardiovasc Med 2022; 9:869259. [PMID: 35811698 PMCID: PMC9261975 DOI: 10.3389/fcvm.2022.869259] [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: 02/04/2022] [Accepted: 04/22/2022] [Indexed: 11/20/2022] Open
Abstract
Background A clinical study comparing the hemodynamic outcomes of transcatheter mitral valve replacement (TMVR) with vs. without Laceration of the Anterior Mitral leaflet to Prevent Outflow Obstruction (LAMPOON) has never been designed nor conducted. Aims To quantify the hemodynamic impact of LAMPOON in TMVR using patient-specific computational (in silico) models. Materials Eight subjects from the LAMPOON investigational device exemption trial were included who had acceptable computed tomography (CT) data for analysis. All subjects were anticipated to be at prohibitive risk of left ventricular outflow tract (LVOT) obstruction from TMVR, and underwent successful LAMPOON immediately followed by TMVR. Using post-procedure CT scans, two 3D anatomical models were created for each subject: (1) TMVR with LAMPOON (performed procedure), and (2) TMVR without LAMPOON (virtual control). A validated computational fluid dynamics (CFD) paradigm was then used to simulate the hemodynamic outcomes for each condition. Results LAMPOON exposed on average 2 ± 0.6 transcatheter valve cells (70 ± 20 mm2 total increase in outflow area) which provided an additional pathway for flow into the LVOT. As compared to TMVR without LAMPOON, TMVR with LAMPOON resulted in lower peak LVOT velocity, lower peak LVOT gradient, and higher peak LVOT effective orifice area by 0.4 ± 0.3 m/s (14 ± 7% improvement, p = 0.006), 7.6 ± 10.9 mmHg (31 ± 17% improvement, p = 0.01), and 0.2 ± 0.1 cm2 (17 ± 9% improvement, p = 0.002), respectively. Conclusion This was the first study to permit a quantitative, patient-specific comparison of LVOT hemodynamics following TMVR with and without LAMPOON. The LAMPOON procedure achieved a critical increment in outflow area which was effective for improving LVOT hemodynamics, particularly for subjects with a small neo-left ventricular outflow tract (neo-LVOT).
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Affiliation(s)
- Keshav Kohli
- Wallace H. Coulter Department of Biomedical Engineering at the Georgia Institute of Technology and Emory University, Atlanta, GA, United States
- *Correspondence: Keshav Kohli,
| | - Zhenglun Alan Wei
- Wallace H. Coulter Department of Biomedical Engineering at the Georgia Institute of Technology and Emory University, Atlanta, GA, United States
- Department of Biomedical Engineering, University of Massachusetts Lowell, Lowell, MA, United States
| | - Vahid Sadri
- Wallace H. Coulter Department of Biomedical Engineering at the Georgia Institute of Technology and Emory University, Atlanta, GA, United States
| | - Andrew W. Siefert
- Wallace H. Coulter Department of Biomedical Engineering at the Georgia Institute of Technology and Emory University, Atlanta, GA, United States
| | - Philipp Blanke
- Department of Radiology, St. Paul’s Hospital, The University of British Columbia, Vancouver, BC, Canada
| | - Emily Perdoncin
- Structural Heart and Valve Center, Emory University Hospital, Atlanta, GA, United States
| | - Adam B. Greenbaum
- Structural Heart and Valve Center, Emory University Hospital, Atlanta, GA, United States
| | - Jaffar M. Khan
- Cardiovascular Branch, Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD, United States
| | - Robert J. Lederman
- Cardiovascular Branch, Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD, United States
| | - Vasilis C. Babaliaros
- Structural Heart and Valve Center, Emory University Hospital, Atlanta, GA, United States
| | - Ajit P. Yoganathan
- Wallace H. Coulter Department of Biomedical Engineering at the Georgia Institute of Technology and Emory University, Atlanta, GA, United States
| | - John N. Oshinski
- Wallace H. Coulter Department of Biomedical Engineering at the Georgia Institute of Technology and Emory University, Atlanta, GA, United States
- Department of Radiology and Imaging Science, Emory University School of Medicine, Atlanta, GA, United States
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Effect of catheter ablation on the hemodynamics of the left atrium. J Interv Card Electrophysiol 2022; 65:83-96. [DOI: 10.1007/s10840-022-01191-3] [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: 12/27/2021] [Accepted: 03/19/2022] [Indexed: 11/26/2022]
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Computational Methods for Fluid-Structure Interaction Simulation of Heart Valves in Patient-Specific Left Heart Anatomies. FLUIDS 2022. [DOI: 10.3390/fluids7030094] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Given the complexity of human left heart anatomy and valvular structures, the fluid–structure interaction (FSI) simulation of native and prosthetic valves poses a significant challenge for numerical methods. In this review, recent numerical advancements for both fluid and structural solvers for heart valves in patient-specific left hearts are systematically considered, emphasizing the numerical treatments of blood flow and valve surfaces, which are the most critical aspects for accurate simulations. Numerical methods for hemodynamics are considered under both the continuum and discrete (particle) approaches. The numerical treatments for the structural dynamics of aortic/mitral valves and FSI coupling methods between the solid Ωs and fluid domain Ωf are also reviewed. Future work toward more advanced patient-specific simulations is also discussed, including the fusion of high-fidelity simulation within vivo measurements and physics-based digital twining based on data analytics and machine learning techniques.
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de Oliveira DC, Espino DM, Deorsola L, Mynard JP, Rajagopal V, Buchan K, Dawson D, Shepherd DET. A toolbox for generating scalable mitral valve morphometric models. Comput Biol Med 2021; 135:104628. [PMID: 34246162 DOI: 10.1016/j.compbiomed.2021.104628] [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: 03/11/2021] [Revised: 06/25/2021] [Accepted: 07/02/2021] [Indexed: 11/26/2022]
Abstract
The mitral valve is a complex anatomical structure, whose shape is key to several traits of its function and disease, being crucial for the success of surgical repair and implantation of medical devices. The aim of this study was to develop a parametric, scalable, and clinically useful model of the mitral valve, enabling the biomechanical evaluation of mitral repair techniques through finite element simulations. MATLAB was used to parameterize the valve: the annular boundary was sampled from a porcine mitral valve mesh model and landmark points and relevant boundaries were selected for the parameterization of leaflets using polynomial fitting. Several geometric parameters describing the annulus, leaflet shape and papillary muscle position were implemented and used to scale the model according to patient dimensions. The developed model, available as a toolbox, allows for the generation of a population of models using patient-specific dimensions obtained from medical imaging or averaged dimensions evaluated from empirical equations based on the Golden Proportion. The average model developed using this framework accurately represents mitral valve shapes, associated with relative errors reaching less than 10% for annular and leaflet length dimensions, and less than 24% in comparison with clinical data. Moreover, model generation takes less than 5 min of computing time, and the toolbox can account for individual morphological variations and be employed to evaluate mitral valve biomechanics; following further development and validation, it will aid clinicians when choosing the best patient-specific clinical intervention and improve the design process of new medical devices.
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Affiliation(s)
- Diana C de Oliveira
- Department of Mechanical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
| | - Daniel M Espino
- Department of Mechanical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Luca Deorsola
- Paedriatic Cardiac Surgery, Ospedale Infantile Regina Margherita Sant Anna, Turin, 10126, Italy
| | - Jonathan P Mynard
- Department of Biomedical Engineering, The University of Melbourne, Melbourne, VIC, 3010, Australia; Heart Research, Murdoch Children's Research Institute, Royal Children's Hospital, Melbourne, VIC, 3052, Australia; Department of Paediatrics, The University of Melbourne, Melbourne, VIC, 3010, Australia; Department of Cardiology, Royal Children's Hospital, Melbourne, VIC, 3052, Australia
| | - Vijay Rajagopal
- Department of Biomedical Engineering, The University of Melbourne, Melbourne, VIC, 3010, Australia
| | - Keith Buchan
- Department of Cardiothoracic Surgery, Aberdeen Royal Infirmary, Aberdeen, AB24 2ZN, Scotland, UK
| | - Dana Dawson
- School of Medicine, University of Aberdeen, Aberdeen, AB25 2ZD, Scotland, UK; Cardiology Department, Aberdeen Royal Infirmary, Aberdeen, AB25 2ZN, Scotland, UK
| | - Duncan E T Shepherd
- Department of Mechanical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
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