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Kreinin Y, Talmon Y, Levi M, Khoury M, Or I, Raad M, Bolotin G, Sznitman J, Korin N. A Fibrin-Thrombin Based In Vitro Perfusion System to Study Flow-Related Prosthetic Heart Valves Thrombosis. Ann Biomed Eng 2024; 52:1665-1677. [PMID: 38459196 PMCID: PMC11082030 DOI: 10.1007/s10439-024-03480-6] [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: 11/02/2023] [Accepted: 02/20/2024] [Indexed: 03/10/2024]
Abstract
Prosthetic heart valve (PHV) replacement has increased the survival rate and quality of life for heart valve-diseased patients. However, PHV thrombosis remains a critical problem associated with these procedures. To better understand the PHV flow-related thrombosis problem, appropriate experimental models need to be developed. In this study, we present an in vitro fibrin clot model that mimics clot accumulation in PHVs under relevant hydrodynamic conditions while allowing real-time imaging. We created 3D-printed mechanical aortic valve models that were inserted into a transparent glass aorta model and connected to a system that simulates human aortic flow pulse and pressures. Thrombin was gradually injected into a circulating fibrinogen solution to induce fibrin clot formation, and clot accumulation was quantified via image analysis. The results of valves positioned in a normal versus a tilted configuration showed that clot accumulation correlated with the local flow features and was mainly present in areas of low shear and high residence time, where recirculating flows are dominant, as supported by computational fluid dynamic simulations. Overall, our work suggests that the developed method may provide data on flow-related clot accumulation in PHVs and may contribute to exploring new approaches and valve designs to reduce valve thrombosis.
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Affiliation(s)
- Yevgeniy Kreinin
- Department of Biomedical Engineering, Technion-IIT, 3200003, Haifa, Israel
| | - Yahel Talmon
- Department of Biomedical Engineering, Technion-IIT, 3200003, Haifa, Israel
| | - Moran Levi
- Department of Biomedical Engineering, Technion-IIT, 3200003, Haifa, Israel
| | - Maria Khoury
- Department of Biomedical Engineering, Technion-IIT, 3200003, Haifa, Israel
| | - Itay Or
- Department of Cardiac Surgery, Rambam Health Care Campus, 3109601, Haifa, Israel
| | - Mahli Raad
- Department of Cardiac Surgery, Rambam Health Care Campus, 3109601, Haifa, Israel
| | - Gil Bolotin
- Department of Cardiac Surgery, Rambam Health Care Campus, 3109601, Haifa, Israel
- The Ruth Bruce Rappaport Faculty of Medicine, Technion-IIT, 3525433, Haifa, Israel
| | - Josué Sznitman
- Department of Biomedical Engineering, Technion-IIT, 3200003, Haifa, Israel
| | - Netanel Korin
- Department of Biomedical Engineering, Technion-IIT, 3200003, Haifa, Israel.
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Haberman D, Chitturi KR, Waksman R. Leaflet modification with the ShortCut™ device to prevent coronary artery obstruction during TAVR. CARDIOVASCULAR REVASCULARIZATION MEDICINE 2024:S1553-8389(24)00098-8. [PMID: 38565427 DOI: 10.1016/j.carrev.2024.03.010] [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: 03/15/2024] [Accepted: 03/15/2024] [Indexed: 04/04/2024]
Abstract
Transcatheter heart valve (THV) procedures require careful planning and consideration to prevent coronary artery obstruction (CAO), which poses a significant and potentially life-threatening condition, especially in patients undergoing valve-in-valve (ViV) transcatheter aortic valve replacement (TAVR). Despite identifying predictors of CAO and utilization of computed tomography and inputting THV features, a significant uncertainty remains in predicting CAO. The ShortCut™ device (Pi-Cardia, Rehovot, Israel) was purposefully designed to modify the leaflets in patients undergoing TAVR, especially prior to ViV procedures, to overcome the risk for CAO. This review aims to detail the device's objectives, structure, procedural steps, the available clinical data, and future directions for its intended utilization in the structural arena for the prevention of CAO.
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Affiliation(s)
- Dan Haberman
- Section of Interventional Cardiology, MedStar Washington Hospital Center, Washington, DC, USA
| | - Kalyan R Chitturi
- Section of Interventional Cardiology, MedStar Washington Hospital Center, Washington, DC, USA
| | - Ron Waksman
- Section of Interventional Cardiology, MedStar Washington Hospital Center, Washington, DC, USA.
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3
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Jahren SE, Demirel C, Bornemann KM, Corso P, Stortecky S, Obrist D. Altered blood flow due to larger aortic diameters in patients with transcatheter heart valve thrombosis. APL Bioeng 2023; 7:046120. [PMID: 38125699 PMCID: PMC10732696 DOI: 10.1063/5.0170583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 12/04/2023] [Indexed: 12/23/2023] Open
Abstract
The etiology of transcatheter heart valve thrombosis (THVT) and the relevance of the aortic root geometry on the occurrence of THVT are largely unknown. The first aim of this pilot study is to identify differences in aortic root geometry between THVT patients and patients without THVT after transcatheter aortic valve implantation (TAVI). Second, we aim to investigate how the observed difference in aortic diameters affects the aortic flow using idealized computational geometric models. Aortic dimension was assessed using pre-TAVI multi-detector computed tomography scans of eight patients with clinical apparent THVT and 16 unaffected patients (two for each THVT patient with same valve type and size) from the Bern-TAVI registry. Among patients with THVT the right coronary artery height was lower (-40%), and sinotubular junction (STJ) and ascending aorta (AAo) diameters tended to be larger (9% and 14%, respectively) compared to the unaffected patients. Fluid-structure interaction (FSI) in two idealized aortic models with the observed differences in STJ and AAo diameter showed higher backflow rate at the STJ (+16%), lower velocity magnitudes in the sinus (-5%), and higher systolic turbulent dissipation rate in the AAo (+8%) in the model with larger STJ and AAo diameters. This pilot study suggests a direct effect of the aortic dimensions on clinically apparent THVT. The FSI study indicates that larger STJ and AAo diameters potentially favor thrombus formation by increased backflow rate and reduced wash-out efficiency of the sinus. The reported observations require clinical validation but could potentially help identifying patients at risk for THVT.
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Affiliation(s)
- Silje Ekroll Jahren
- ARTORG Center for Biomedical Engineering Research, University of Bern, Bern, Switzerland
| | - Caglayan Demirel
- Department of Cardiology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | | | - Pascal Corso
- ARTORG Center for Biomedical Engineering Research, University of Bern, Bern, Switzerland
| | - Stefan Stortecky
- Department of Cardiology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Dominik Obrist
- ARTORG Center for Biomedical Engineering Research, University of Bern, Bern, Switzerland
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Comparison of performance of self-expanding and balloon-expandable transcatheter aortic valves. JTCVS OPEN 2022; 10:128-139. [PMID: 36004225 PMCID: PMC9390782 DOI: 10.1016/j.xjon.2022.04.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 03/20/2022] [Accepted: 04/12/2022] [Indexed: 11/23/2022]
Abstract
Objective Methods Results Conclusions
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Vogl BJ, El Shaer A, Crestanello JA, Alkhouli M, Hatoum H. Flow dynamics in the sinus and downstream of third and fourth generation balloon expandable transcatheter aortic valves. J Mech Behav Biomed Mater 2022; 127:105092. [DOI: 10.1016/j.jmbbm.2022.105092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 12/27/2021] [Accepted: 01/12/2022] [Indexed: 10/19/2022]
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Hatoum H, Gooden SCM, Sathananthan J, Sellers S, Kutting M, Marx P, Lilly SM, Ihdayhid AR, Thourani VH, Dasi LP. Neosinus and Sinus Flow After Self-Expanding and Balloon-Expandable Transcatheter Aortic Valve Replacement. JACC Cardiovasc Interv 2021; 14:2657-2666. [PMID: 34838462 DOI: 10.1016/j.jcin.2021.09.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 09/10/2021] [Accepted: 09/14/2021] [Indexed: 10/19/2022]
Abstract
OBJECTIVES The aim of this study was to evaluate flow dynamics in the aortic sinus and the neosinus (NS) after transcatheter heart valve (THV) implantation in valve-in-valve (ViV). BACKGROUND Leaflet thrombosis may occur on THVs and affect performance and durability. Differences in flow dynamics may affect the risk for leaflet thrombosis. METHODS Hemodynamic assessment following THV implantation in a surgical aortic valve was performed in a left heart simulator under pulsatile physiological conditions. Assessment was performed using a 23-mm polymeric surgical aortic valve (not diseased) and multiple THV platforms, including self-expanding devices (26-mm Evolut, 23-mm Allegra, small ACURATE neo) and a balloon-expandable device (23-mm SAPIEN 3). Particle image velocimetry was performed to assess flow in the sinus and NS. Sinus and NS washout, shear stress, and velocity were calculated. RESULTS Sinus and NS washout was fastest and approximately 1 cardiac cycle for each with the Evolut, ACURATE neo, and Allegra compared with the SAPIEN 3, with washout in 2 and 3 cardiac cycles, respectively. The Allegra showed the largest shear stress distribution in the sinus, followed by the SAPIEN 3. In the NS, all 4 valves showed equal likelihoods of occurrence of shear stress <1 Pa, but the Allegra showed the highest likelihoods of occurrence for shear stress >1 Pa. The velocities in the sinus and NS were 0.05, 0.078, 0.080, and 0.075 m/s for Evolut, SAPIEN 3, ACURATE neo, and Allegra ViV, respectively. CONCLUSIONS Sinus and NS flow dynamics differ substantially among THVs after ViV. Self-expanding supra-annular valves seem to have faster washouts compared with an equivalent-size balloon-expandable THV.
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Affiliation(s)
- Hoda Hatoum
- Biomedical Engineering Department, Michigan Technological University, Houghton, Michigan, USA; Health Research Institute, Houghton, Michigan, USA; Center for Biocomputing and Digital Health, Michigan Technological University, Houghton, Michigan, USA.
| | - Shelley C M Gooden
- Biomedical Engineering Department, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Janarthanan Sathananthan
- Center for Cardiovascular Innovation, Cardiovascular Translational Laboratory, St. Paul's Hospital, University of British Columbia, Vancouver, British Columbia, Canada
| | - Stephanie Sellers
- Center for Cardiovascular Innovation, Cardiovascular Translational Laboratory, St. Paul's Hospital, University of British Columbia, Vancouver, British Columbia, Canada
| | | | | | - Scott M Lilly
- Division of Cardiovascular Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Abdul R Ihdayhid
- Fiona Stanley Hospital, Harry Perkins Institute of Medical Research, Perth, Australia
| | - Vinod H Thourani
- Department of Cardiovascular Surgery, Marcus Valve Center, Piedmont Heart Institute, Atlanta, Georgia, USA
| | - Lakshmi Prasad Dasi
- Biomedical Engineering Department, Georgia Institute of Technology, Atlanta, Georgia, USA
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Hatoum H, Singh-Gryzbon S, Esmailie F, Ruile P, Neumann FJ, Blanke P, Thourani VH, Yoganathan AP, Dasi LP. Predictive Model for Thrombus Formation After Transcatheter Valve Replacement. Cardiovasc Eng Technol 2021; 12:576-588. [PMID: 34859378 PMCID: PMC11034843 DOI: 10.1007/s13239-021-00596-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 11/09/2021] [Indexed: 12/27/2022]
Abstract
PURPOSE Leaflet thrombosis is a significant adverse event after transcatheter aortic valve (TAV) replacement (TAVR). The purpose of our study was to present a semi-empirical, mathematical model that links patient-specific anatomic, valve, and flow parameters to predict likelihood of leaflet thrombosis. METHODS The two main energy sources of neo-sinus (NS) washout after TAVR include the jet flow downstream of the TAV and NS geometric change in volume due to the leaflets opening and closing. Both are highly dependent on patient anatomic and hemodynamic factors. As rotation of blood flow is prevalent in both the sinus of Valsalva and then the NS, we adopted the vorticity flux or circulation (Г) as a metric quantifying overall washout. Leaflet thrombus volumes were segmented based on hypo-attenuating leaflet thickening (HALT) in post-TAVR patient's gated computed tomography. Г was assessed using dimensional scaling as well as computational fluid dynamics (CFD) respectively and correlated to the thrombosis volumes using sensitivity and specificity analysis. RESULTS Г in the NS, that accounted for patient flow and anatomic conditions derived from scaling arguments significantly better predicted the occurrence of leaflet thrombus than CFD derived measures such as stasis volumes or wall shear stress. Given results from the six patient datasets considered herein, a threshold Г value of 28.0 yielded a sensitivity and specificity of 100% where patients with Gamma < 28 developed valve thrombosis. A 10% error in measurements of all variables can bring the sensitivity specificity down to 87%. CONCLUSION A predictive model relating likelihood of valve thrombosis using Г in the NS was developed with promising sensitivity and specificity. With further studies and improvements, this predictive technology may lead to alerting physicians on the risk for thrombus formation following TAVR.
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Affiliation(s)
- Hoda Hatoum
- Department of Biomedical Engineering, Georgia Institute of Technology, 387 Technology Circle, Atlanta, GA, 30313, USA
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI, USA
| | - Shelly Singh-Gryzbon
- Department of Biomedical Engineering, Georgia Institute of Technology, 387 Technology Circle, Atlanta, GA, 30313, USA
- Department of Chemical & Process Engineering, The University of the West Indies, St Augustine, Trinidad and Tobago
| | - Fateme Esmailie
- Department of Biomedical Engineering, Georgia Institute of Technology, 387 Technology Circle, Atlanta, GA, 30313, USA
| | - Philipp Ruile
- Department of Cardiology and Angiology II, University Heart Center Freiburg-Bad Krozingen, Bad Krozingen, Germany
| | - Franz-Josef Neumann
- Department of Cardiology and Angiology II, University Heart Center Freiburg-Bad Krozingen, Bad Krozingen, Germany
| | - Philipp Blanke
- University of British Columbia and St. Paul's Hospital in Vancouver, Vancouver, Canada
| | - Vinod H Thourani
- Department of Cardiovascular Surgery, Marcus Heart Valve Center, Piedmont Heart Institute, Atlanta, GA, USA
| | - Ajit P Yoganathan
- Department of Biomedical Engineering, Georgia Institute of Technology, 387 Technology Circle, Atlanta, GA, 30313, USA
| | - Lakshmi Prasad Dasi
- Department of Biomedical Engineering, Georgia Institute of Technology, 387 Technology Circle, Atlanta, GA, 30313, USA.
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Vogl BJ, Niemi NR, Griffiths LG, Alkhouli MA, Hatoum H. Impact of calcific aortic valve disease on valve mechanics. Biomech Model Mechanobiol 2021; 21:55-77. [PMID: 34687365 DOI: 10.1007/s10237-021-01527-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Accepted: 10/07/2021] [Indexed: 10/20/2022]
Abstract
The aortic valve is a highly dynamic structure characterized by a transvalvular flow that is unsteady, pulsatile, and characterized by episodes of forward and reverse flow patterns. Calcific aortic valve disease (CAVD) resulting in compromised valve function and increased pressure overload on the ventricle potentially leading to heart failure if untreated, is the most predominant valve disease. CAVD is a multi-factorial disease involving molecular, tissue and mechanical interactions. In this review, we aim at recapitulating the biomechanical loads on the aortic valve, summarizing the current and most recent research in the field in vitro, in-silico, and in vivo, and offering a clinical perspective on current strategies adopted to mitigate or approach CAVD.
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Affiliation(s)
- Brennan J Vogl
- Biomedical Engineering Department, Michigan Technological University, 1400 Townsend Dr, Houghton, MI, 49931, USA
| | - Nicholas R Niemi
- Biomedical Engineering Department, Michigan Technological University, 1400 Townsend Dr, Houghton, MI, 49931, USA
| | - Leigh G Griffiths
- Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, USA
| | | | - Hoda Hatoum
- Biomedical Engineering Department, Michigan Technological University, 1400 Townsend Dr, Houghton, MI, 49931, USA. .,Health Research Institute, Michigan Technological University, Houghton, MI, USA. .,Center of Biocomputing and Digital Health, Michigan Technological University, Houghton, MI, USA.
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Medranda GA, Rogers T. Risk and Mitigation of Coronary Obstruction in Transcatheter Aortic Valve Replacement. Interv Cardiol Clin 2021; 10:481-490. [PMID: 34593111 DOI: 10.1016/j.iccl.2021.05.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Acute coronary artery occlusion is a rare but devastating complication of transcatheter aortic valve replacement. Coronary obstruction is angiographic evidence of a new-partial or complete-obstruction of a coronary artery. Key factors identifying patients at risk are aortic root anatomy, type of aortic valve, and type of transcatheter heart valve. Techniques to prevent coronary obstruction include intentional leaflet laceration. If acute coronary obstruction does occur, bailout stenting can be challenging and conversion to emergent open heart surgery may be required, both of which are associated with high morbidity and mortality.
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Affiliation(s)
- Giorgio A Medranda
- Section of Interventional Cardiology, MedStar Washington Hospital Center, 110 Irving Street NW, Suite 4B1, Washington, DC 20010, USA
| | - Toby Rogers
- Section of Interventional Cardiology, MedStar Washington Hospital Center, 110 Irving Street NW, Suite 4B1, Washington, DC 20010, USA; Cardiovascular Branch, Division of Intramural Research, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD, USA.
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Plitman Mayo R, Yaakobovich H, Finkelstein A, Shadden SC, Marom G. Impact of BASILICA on the thrombogenicity potential of valve-in-valve implantations. J Biomech 2021; 118:110309. [PMID: 33601181 DOI: 10.1016/j.jbiomech.2021.110309] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Accepted: 02/03/2021] [Indexed: 01/17/2023]
Abstract
Subclinical leaflet thrombosis is becoming a major concern in valve-in-valve procedures, whereby a transcatheter aortic valve device is deployed inside a failed bioprosthetic surgical valve. Blood flow stagnation and prolonged residence times in the neo-sinuses have been suggested as possible explanations for leaflet thrombosis. The BASILICA technique, which was originally developed to treat coronary flow obstruction, has also been proposed as an alternative to reduce the risk of thrombus formation. The aim of this study is to understand the impact of BASILICA on the valve-in-valve thrombogenicity using computational fluid dynamics simulations. To this end, two Eulerian and two Lagrangian approaches were employed to estimate near-wall stagnation measures in eight valve-in-valve models. The models included an intact or lacerated Sorin Mitroflow surgical valve, and either a SAPIEN or Evolut transcatheter aortic valve device. The Lagrangian approaches predicted a high number of particles and vortices concentration in the proximal areas of the neo-sinuses, while the Eulerian approaches did so in the distal areas. As a consequence, this study demonstrated that Lagrangian approaches are better predictors of subclinical leaflet thrombosis, since they match experimental and clinical findings. Additionally, the SAPIEN valve possess a higher risk for developing leaflet thrombosis, and two lacerations are shown to provide the best results in terms of development of vortices and accumulation of particles within the neo-sinuses. This study highlights the potential of computational modeling in aiding clinicians in their decision-making in valve-in-valve and BASILICA procedures.
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Affiliation(s)
| | - Halit Yaakobovich
- Department of Biomedical Engineering, Tel Aviv University, Tel Aviv, Israel
| | | | - Shawn C Shadden
- Department of Mechanical Engineering, University of California, Berkeley, CA, USA
| | - Gil Marom
- School of Mechanical Engineering, Tel Aviv University, Tel Aviv, Israel.
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An Evaluation of the Influence of Coronary Flow on Transcatheter Heart Valve Neo-Sinus Flow Stasis. Ann Biomed Eng 2019; 48:169-180. [DOI: 10.1007/s10439-019-02324-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Accepted: 07/11/2019] [Indexed: 12/25/2022]
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