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Breitenstein-Attach A, Steitz M, Sun X, Hao Y, Kiekenap J, Emeis J, Tuladhar SR, Berger F, Schmitt B. In Vitro Comparison of a Closed and Semi-closed Leaflet Design for Adult and Pediatric Transcatheter Heart Valves. Ann Biomed Eng 2024:10.1007/s10439-024-03502-3. [PMID: 38615078 DOI: 10.1007/s10439-024-03502-3] [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: 10/18/2023] [Accepted: 03/25/2024] [Indexed: 04/15/2024]
Abstract
Transcatheter heart valve replacements (TVR) are mostly designed in a closed position (c) with leaflets coaptating. However, recent literature suggests fabricating valves in semi-closed (sc) position to minimize pinwheeling. With about 100,000 children in need of a new pulmonary valve each year worldwide, this study evaluates both geometrical approaches in adult as well as pediatric size and condition. Three valves of each geometry were fabricated in adult (30 mm) and pediatric (15 mm) size, using porcine pericardium. To evaluate performance, the mean transvalvular pressure gradient (TPG), effective orifice area (EOA), and regurgitation fraction (RF) were determined in three different annulus geometries (circular, elliptic, and tilted). For both adult-sized valve geometries, the TPG (TPGC = 2.326 ± 0.115 mmHg; TPGSC = 1.848 ± 0.175 mmHg)* and EOA (EOAC = 3.69 ± 0.255 cm2; EOASC = 3.565 ± 0.025 cm2)* showed no significant difference. Yet the RF as well as its fluctuation was significantly higher for valves with the closed geometry (RFC = 12.657 ± 7.669 %; RFSC = 8.72 ± 0.977 %)*. Recordings showed that the increased backflow was caused by pinwheeling due to a surplus of tissue material. Hydrodynamic testing of pediatric TVRs verified the semi-closed geometry being favourable. Despite the RF (RFC = 7.721 ± 0.348 cm2; RFSC = 5.172 ± 0.679 cm2), these valves also showed an improved opening behaviour ((TPGC = 20.929 ± 0.497 cm2; TPGSC = 15.972 ± 1.158 cm2); (EOAC = 0.629 ± 0.017 cm2; EOASC = 0.731 ± 0.026 cm2)). Both adult and pediatric TVR with semi-closed geometry show better fluiddynamic functionality compared to valves with a closed design due to less pinwheeling. Besides improved short-term functionality, less pinwheeling potentially prevents early valve degeneration and improves durability. *Results are representatively shown for a circular annulus geometry.
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Affiliation(s)
- Alexander Breitenstein-Attach
- Department of Pediatric Cardiology and Congenital Heart Disease, German Heart Center Berlin (Charité), Augustenburger Platz 1, Berlin, Germany.
- Department of Pediatric Cardiology and Congenital Heart Disease, Charité - University Medicine Berlin, Augustenburger Platz 1, Berlin, Germany.
- DZHK (German Centre for Cardiovascular Research), Potsdamer Str. 58, Berlin, Germany.
| | - Marvin Steitz
- Department of Pediatric Cardiology and Congenital Heart Disease, German Heart Center Berlin (Charité), Augustenburger Platz 1, Berlin, Germany
- Department of Pediatric Cardiology and Congenital Heart Disease, Charité - University Medicine Berlin, Augustenburger Platz 1, Berlin, Germany
- DZHK (German Centre for Cardiovascular Research), Potsdamer Str. 58, Berlin, Germany
| | - Xiaolin Sun
- Department of Pediatric Cardiology and Congenital Heart Disease, German Heart Center Berlin (Charité), Augustenburger Platz 1, Berlin, Germany
- Department of Pediatric Cardiology and Congenital Heart Disease, Charité - University Medicine Berlin, Augustenburger Platz 1, Berlin, Germany
- DZHK (German Centre for Cardiovascular Research), Potsdamer Str. 58, Berlin, Germany
| | - Yimeng Hao
- Department of Pediatric Cardiology and Congenital Heart Disease, German Heart Center Berlin (Charité), Augustenburger Platz 1, Berlin, Germany
- Department of Pediatric Cardiology and Congenital Heart Disease, Charité - University Medicine Berlin, Augustenburger Platz 1, Berlin, Germany
| | - Jonathan Kiekenap
- Department of Pediatric Cardiology and Congenital Heart Disease, German Heart Center Berlin (Charité), Augustenburger Platz 1, Berlin, Germany
- Department of Pediatric Cardiology and Congenital Heart Disease, Charité - University Medicine Berlin, Augustenburger Platz 1, Berlin, Germany
| | - Jasper Emeis
- Department of Pediatric Cardiology and Congenital Heart Disease, German Heart Center Berlin (Charité), Augustenburger Platz 1, Berlin, Germany
- Department of Pediatric Cardiology and Congenital Heart Disease, Charité - University Medicine Berlin, Augustenburger Platz 1, Berlin, Germany
| | - Sugat Ratna Tuladhar
- Department for Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, Carl-Neuberg-Straße 1, Hannover, Germany
| | - Felix Berger
- Department of Pediatric Cardiology and Congenital Heart Disease, German Heart Center Berlin (Charité), Augustenburger Platz 1, Berlin, Germany
- Department of Pediatric Cardiology and Congenital Heart Disease, Charité - University Medicine Berlin, Augustenburger Platz 1, Berlin, Germany
| | - Boris Schmitt
- Department of Pediatric Cardiology and Congenital Heart Disease, German Heart Center Berlin (Charité), Augustenburger Platz 1, Berlin, Germany
- Department of Pediatric Cardiology and Congenital Heart Disease, Charité - University Medicine Berlin, Augustenburger Platz 1, Berlin, Germany
- DZHK (German Centre for Cardiovascular Research), Potsdamer Str. 58, Berlin, Germany
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Vogl B, Sularz A, Lilly S, Thourani VH, Lindman BR, Alkhouli M, Hatoum H. Effect of Blood Pressure Levels on Sinus Hemodynamics in Relation to Calcification After Bioprosthetic Aortic Valve Replacement. Ann Biomed Eng 2024; 52:888-897. [PMID: 38157105 DOI: 10.1007/s10439-023-03426-4] [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: 08/29/2023] [Accepted: 12/11/2023] [Indexed: 01/03/2024]
Abstract
Coexisting hypertension and aortic stenosis are common. Some studies showed that elevated blood pressures may be associated with progression of calcific aortic valve disease (CAVD) while others showed no correlation. Flow dynamics in the sinuses of Valsalva are considered key factors in the progression of CAVD. While the relationship between hemodynamics and CAVD is not yet fully understood, it has been demonstrated that they are tightly correlated. This study aims to investigate the effect of changing systolic and diastolic blood pressures (SBP and DBP, respectively) on sinus hemodynamics in relation to potential initiation or progression of CAVD after aortic valve replacement (AVR). Evolut R, SAPIEN 3 and Magna valves were deployed in an aortic root under pulsatile conditions. Using particle image velocimetry, the hemodynamics in the sinus were assessed. The velocity, vorticity, circulation ( Γ ) and shear stress were calculated. This study shows that under elevated SBP and DBP, velocity, vorticity, and shear stress nearby the leaflets increased. Additionally, larger fluctuations of Γ and area under the curve throughout the cardiac cycle were observed. Elevated blood pressures are associated with higher velocity, vorticity, and shear stress near the leaflets which may initiate or accelerate pro-calcific changes in the prosthetic leaflets leading to bioprosthetic valve degeneration.
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Affiliation(s)
- Brennan Vogl
- Biomedical Engineering Department, Michigan Technological University, 1400 Townsend Dr, Houghton, MI, 49931, USA
| | - Agata Sularz
- Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, USA
| | - Scott Lilly
- Department of Cardiovascular Medicine, The Ohio State University, Columbus, OH, USA
| | - Vinod H Thourani
- Department of Cardiovascular Surgery, Marcus Valve Center, Piedmont Heart Institute, Atlanta, GA, USA
| | - Brian R Lindman
- Division of Cardiovascular Medicine, Structural Heart and Valve Center, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Mohamad Alkhouli
- 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, Center of Biocomputing and Digital Health and Institute of Computing and Cybernetics, Michigan Technological University, Houghton, MI, USA.
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Robinson A, Nkansah A, Bhat S, Karnik S, Jones S, Fairley A, Leung J, Wancura M, Sacks MS, Dasi LP, Cosgriff-Hernandez E. Hydrogel-polyurethane fiber composites with enhanced microarchitectural control for heart valve replacement. J Biomed Mater Res A 2024; 112:586-599. [PMID: 38018452 DOI: 10.1002/jbm.a.37641] [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: 06/08/2023] [Revised: 09/22/2023] [Accepted: 10/24/2023] [Indexed: 11/30/2023]
Abstract
Polymeric heart valves offer the potential to overcome the limited durability of tissue based bioprosthetic valves and the need for anticoagulant therapy of mechanical valve replacement options. However, developing a single-phase material with requisite biological properties and target mechanical properties remains a challenge. In this study, a composite heart valve material was developed where an electrospun mesh provides tunable mechanical properties and a hydrogel coating confers an antifouling surface for thromboresistance. Key biological responses were evaluated in comparison to glutaraldehyde-fixed pericardium. Platelet and bacterial attachment were reduced by 38% and 98%, respectively, as compared to pericardium that demonstrated the antifouling nature of the hydrogel coating. There was also a notable reduction (59%) in the calcification of the composite material as compared to pericardium. A custom 3D-printed hydrogel coating setup was developed to make valve composites for device-level hemodynamic testing. Regurgitation fraction (9.6 ± 1.8%) and effective orifice area (1.52 ± 0.34 cm2 ) met ISO 5840-2:2021 requirements. Additionally, the mean pressure gradient was comparable to current clinical bioprosthetic heart valves demonstrating preliminary efficacy. Although the hemodynamic properties are promising, it is anticipated that the random microarchitecture will result in suboptimal strain fields and peak stresses that may accelerate leaflet fatigue and degeneration. Previous computational work has demonstrated that bioinspired fiber microarchitectures can improve strain homogeneity of valve materials toward improving durability. To this end, we developed advanced electrospinning methodologies to achieve polyurethane fiber microarchitectures that mimic or exceed the physiological ranges of alignment, tortuosity, and curvilinearity present in the native valve. Control of fiber alignment from a random fiber orientation at a normalized orientation index (NOI) 14.2 ± 6.9% to highly aligned fibers at a NOI of 85.1 ± 1.4%. was achieved through increasing mandrel rotational velocity. Fiber tortuosity and curvilinearity in the range of native valve features were introduced through a post-spinning annealing process and fiber collection on a conical mandrel geometry, respectively. Overall, these studies demonstrate the potential of hydrogel-polyurethane fiber composite as a heart valve material. Future studies will utilize the developed advanced electrospinning methodologies in combination with model-directed fabrication toward optimizing durability as a function of fiber microarchitecture.
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Affiliation(s)
- Andrew Robinson
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, Texas, USA
| | - Abbey Nkansah
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, Texas, USA
| | - Sanchita Bhat
- Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Shweta Karnik
- Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Sarah Jones
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, Texas, USA
| | - Ashauntee Fairley
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, Texas, USA
| | - Jonathan Leung
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, Texas, USA
| | - Megan Wancura
- Department of Chemistry, The University of Texas at Austin, Austin, Texas, USA
| | - Michael S Sacks
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, Texas, USA
- James T. Willerson Center for Cardiovascular Modeling and Simulation, The Oden Institute for Computational Engineering and Sciences, Austin, Texas, USA
- Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas, USA
| | - Lakshmi Prasad Dasi
- Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
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Faza NN, Harb SC, Wang DD, van den Dorpel MMP, Van Mieghem N, Little SH. Physical and Computational Modeling for Transcatheter Structural Heart Interventions. JACC Cardiovasc Imaging 2024; 17:428-440. [PMID: 38569793 DOI: 10.1016/j.jcmg.2024.01.014] [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: 04/17/2023] [Revised: 01/10/2024] [Accepted: 01/11/2024] [Indexed: 04/05/2024]
Abstract
Structural heart disease interventions rely heavily on preprocedural planning and simulation to improve procedural outcomes and predict and prevent potential procedural complications. Modeling technologies, namely 3-dimensional (3D) printing and computational modeling, are nowadays increasingly used to predict the interaction between cardiac anatomy and implantable devices. Such models play a role in patient education, operator training, procedural simulation, and appropriate device selection. However, current modeling is often limited by the replication of a single static configuration within a dynamic cardiac cycle. Recognizing that health systems may face technical and economic limitations to the creation of "in-house" 3D-printed models, structural heart teams are pivoting to the use of computational software for modeling purposes.
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Affiliation(s)
- Nadeen N Faza
- Houston Methodist DeBakey Heart and Vascular Center, Houston, Texas, USA
| | | | | | | | | | - Stephen H Little
- Houston Methodist DeBakey Heart and Vascular Center, Houston, Texas, USA.
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Vogl BJ, Chavez-Ponce A, Wentworth A, Erie E, Yadav P, Thourani VH, Dasi LP, Lindman B, Alkhouli M, Hatoum H. Differential Impact of Blood Pressure Control Targets on Epicardial Coronary Flow After Transcatheter Aortic Valve Replacement. STRUCTURAL HEART : THE JOURNAL OF THE HEART TEAM 2024; 8:100230. [PMID: 38283570 PMCID: PMC10818148 DOI: 10.1016/j.shj.2023.100230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 07/31/2023] [Accepted: 09/27/2023] [Indexed: 01/30/2024]
Abstract
Background The cause for the association between increased cardiovascular mortality rates and lower blood pressure (BP) after aortic valve replacement (AVR) is unclear. This study aims to assess how the epicardial coronary flow (ECF) after AVR varies as BP levels are changed in the presence of a right coronary lesion. Methods The hemodynamics of a 3D printed aortic root model with a SAPIEN 3 26 deployed were evaluated in an in vitro left heart simulator under a range of varying systolic blood pressure (SBP) and diastolic blood pressure (DBP). ECF and the flow ratio index were calculated. Flow index value <0.8 was considered a threshold for ischemia. Results As SBP decreased, the average ECF decreased below the physiological coronary minimum at 120 mmHg. As DBP decreased, the average ECF was still maintained above the physiological minimum. The flow ratio index was >0.9 for SBP ≥130 mmHg. However, at an SBP of 120 mmHg, the flow ratio was 0.63 (p ≤ 0.0055). With decreasing DBP, no BP condition yielded a flow ratio index that was less than 0.91. Conclusions Reducing BP to the current recommended levels assigned for the general population after AVR in the presence of coronary artery disease may require reconsideration of levels and treatment priority. Additional studies are needed to fully understand the changes in ECF dynamics after AVR in the presence and absence of coronary artery disease.
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Affiliation(s)
- Brennan J. Vogl
- Biomedical Engineering Department, Michigan Technological University, Houghton, Michigan, USA
| | | | - Adam Wentworth
- Department of Radiology, Mayo Clinic, Rochester, Minnesota, USA
| | - Eric Erie
- Department of Radiology, Mayo Clinic, Rochester, Minnesota, USA
| | - Pradeep Yadav
- Department of Cardiovascular Surgery, Marcus Valve Center, Piedmont Heart Institute, Atlanta, Georgia, USA
| | - Vinod H. Thourani
- Department of Cardiovascular Surgery, Marcus Valve Center, Piedmont Heart Institute, Atlanta, Georgia, USA
| | - Lakshmi Prasad Dasi
- Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Brian Lindman
- Division of Cardiovascular Medicine, Structural Heart and Valve Center, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Mohamad Alkhouli
- Department of Cardiovascular Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Hoda Hatoum
- Biomedical Engineering Department, Michigan Technological University, Houghton, Michigan, USA
- Health Research Institute, Center of Biocomputing and Digital Health and Institute of Computing and Cybersystems, Michigan Technological University, Houghton, Michigan, USA
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Dayawansa NH, Noaman S, Teng LE, Htun NM. Transcatheter Aortic Valve Therapy for Bicuspid Aortic Valve Stenosis. J Cardiovasc Dev Dis 2023; 10:421. [PMID: 37887868 PMCID: PMC10607300 DOI: 10.3390/jcdd10100421] [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: 09/11/2023] [Revised: 10/01/2023] [Accepted: 10/07/2023] [Indexed: 10/28/2023] Open
Abstract
Transcatheter aortic valve implantation (TAVI) has become first-line treatment for older adults with severe aortic stenosis (AS), however, patients with bicuspid aortic valve (BAV) have been traditionally excluded from randomised trials and guidelines. As familiarity and proficiency of TAVI operators have improved, case-series and observational data have demonstrated the feasibility of successful TAVI in bicuspid aortic valve aortic stenosis (BAV-AS), however, patients with BAV-AS have several distinct characteristics that influence the likelihood of TAVI success. This review aims to summarise the pathophysiology and classification of BAV, published safety data, anatomical challenges and procedural considerations essential for pre-procedural planning, patient selection and procedural success of TAVI in BAV.
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Affiliation(s)
- Nalin H. Dayawansa
- Alfred Health, Melbourne, VIC 3004, Australia; (N.H.D.); (S.N.); (L.E.T.)
- Department of Medicine, Central Clinical School, Monash University, Melbourne, VIC 3004, Australia
- Baker Heart & Diabetes Institute, Melbourne, VIC 3004, Australia
| | - Samer Noaman
- Alfred Health, Melbourne, VIC 3004, Australia; (N.H.D.); (S.N.); (L.E.T.)
- Western Health, St Albans, VIC 3021, Australia
| | - Lung En Teng
- Alfred Health, Melbourne, VIC 3004, Australia; (N.H.D.); (S.N.); (L.E.T.)
| | - Nay Min Htun
- Alfred Health, Melbourne, VIC 3004, Australia; (N.H.D.); (S.N.); (L.E.T.)
- Peninsula Health, Frankston, VIC 3199, Australia
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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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Treatment of Bicuspid Aortic Valve Stenosis with TAVR: Filling Knowledge Gaps Towards Reducing Complications. Curr Cardiol Rep 2022; 24:33-41. [PMID: 35099762 DOI: 10.1007/s11886-021-01617-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 09/24/2021] [Indexed: 12/22/2022]
Abstract
PURPOSE OF REVIEW Bicuspid aortic valve (BAV) disease is the most common congenital heart defect worldwide. When severe, symptomatic aortic stenosis ensues, the treatment has increasingly become transcatheter aortic valve replacement (TAVR). The purpose of this review is to identify BAV classification and imaging methods, outline TAVR outcomes in BAV anatomy, and discuss how computational modeling can enhance TAVR treatment in BAV patients. RECENT FINDINGS TAVR use in BAV patients, when compared to use in tricuspid aortic valves, showed lower device success rate, and there remains no long-term randomized trial data. It has been reported that BAV patients with severe calcification increase the rate of complications. Additionally, the asymmetrical morphology of BAVs often results in asymmetric stent geometries which have implications for increased thrombosis risk and decreased durability. These adverse outcomes are currently very difficult to predict from routine pre-procedural imaging alone. Recently developed patient specific experimental and computational techniques have the potential to assist in filling knowledge gaps in the mechanisms of these complications and provide more information during preclinical planning for better TAVR selection in low surgical risk BAV patients. Efficacy of TAVR for irregular BAV anatomies remains concerning due to the lack of a long-term randomized trial data, their increased rate of short-term complications, and signs that long-term durability could be an issue. More knowledge on identifying which BAV anatomies are at greater risk for these adverse outcomes can potentially improve patient selection for TAVR versus SAVR in low surgical risk BAV patients.
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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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10
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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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Three-dimensional printing to plan intracardiac operations. JTCVS Tech 2021; 9:101-108. [PMID: 34647075 PMCID: PMC8500990 DOI: 10.1016/j.xjtc.2021.02.050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Accepted: 02/11/2021] [Indexed: 11/24/2022] Open
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12
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Flemister DC, Hatoum H, Guhan V, Zebhi B, Lincoln J, Crestanello J, Dasi LP. Effect of Left and Right Coronary Flow Waveforms on Aortic Sinus Hemodynamics and Leaflet Shear Stress: Correlation with Calcification Locations. Ann Biomed Eng 2020; 48:2796-2808. [PMID: 33145675 PMCID: PMC11022940 DOI: 10.1007/s10439-020-02677-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 10/22/2020] [Indexed: 12/22/2022]
Abstract
Coronary flow induces hemodynamic alterations in the aortic sinus region. The objectives of this study are to: (1) investigate the differences among sinus hemodynamics and leaflet wall shear stresses engendered by the left versus right versus non-coronary flow and (2) correlate respective wall shear stresses with leaflet calcification in patients. A left heart simulator flow loop with a tunable coronary circuit provided physiological coronary flow waveforms corresponding to the left coronary cusp case (LCC), right coronary cusp case (RCC), and non-coronary cusp case (NCC). High spatio-temporal resolution particle image velocimetry was conducted to quantify leaflet wall shear stress and sinus vorticity fields and to measure aortic leaflet tip kinematics. Thirty-one patients with severe calcific aortic valve disease were segmented from CT data for the calcific volumes in their respective left, right, and non-coronary cusps. Leaflet tip position during systole shows the RCC has a wider leaflet opening compared to LCC and NCC. Velocity and vorticity fields combined with leaflet position data show that sinus vorticity is diminished (peak ~ 43 s-1) in the LCC while RCC and NCC maintain high vorticity (~ 1200 and ~ 950 s-1 respectively). WSS magnitudes greater than 0.3 Pa show 20 and 81% greater occurrences in the LCC and RCC respectively compared to NCC. Significant differences [X2 (2, n = 31) = 7.31, p = 0.0258] between the calcification levels in each cusp of the patient population. Coronary flow differences between LCC, RCC, and NCC show significant impact on leaflet kinematics and sinus flow hemodynamics. Clinical data correlations of the coronary flow cases indicate the left coronary cusp has a higher likelihood of calcification compared to the right.
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Affiliation(s)
- Dorma C Flemister
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA
| | - 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, 49931, USA
| | - Varshini Guhan
- Department of Neuroscience, The Ohio State University, Columbus, OH, USA
| | - Banafsheh Zebhi
- Department of Mechanical Engineering, Colorado State University, Fort Collins, CO, USA
| | - Joy Lincoln
- Department of Pediatric Cardiology, Children's Hospital of Wisconsin, Milwaukee, WI, USA
| | | | - Lakshmi P Dasi
- Department of Biomedical Engineering, Georgia Institute of Technology, 387 Technology Circle, Atlanta, GA, 30313, USA.
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13
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Hatoum H, Krishnamurthy R, Parthasarathy J, Flemister DC, Krull CM, Walter BA, Mery CM, Molossi S, Dasi LP. Flow Dynamics in Anomalous Aortic Origin of a Coronary Artery in Children: Importance of the Intramural Segment. Semin Thorac Cardiovasc Surg 2020; 34:226-235. [PMID: 33242612 PMCID: PMC11062399 DOI: 10.1053/j.semtcvs.2020.11.027] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Accepted: 11/17/2020] [Indexed: 01/02/2023]
Abstract
This study aims to assess the differences in pressure, fractional flow reserve (FFR) and coronary flow (with increasing pressure) of the proximal coronary artery in patients with anomalous aortic origin of a coronary artery with a confirmed ischemic event, without ischemic events, and before and after unroofing surgery, and compare to a patient with normal coronary arteries. Patient-specific flow models were 3D printed for 3 subjects with anomalous right coronary arteries with intramural course, 2 of them had documented ischemia, and compared with a patient with normal coronaries. The models were placed in the aortic position of a pulse duplicator and precise measurements to quantify FFR and coronary flow rate were performed from the aortic to the mediastinal segment of the anomalous right coronary artery. In an ischemic model, a gradual FFR drop (emulating that of pressure) was shown from the ostium location (∼1.0) to the distal intramural course (0.48). In nonischemic and normal patient models, FFR for all locations did not drop below 0.9. In a second ischemic model prior to repair, a drop to 0.44 was encountered at the intramural and mediastinal intersection, improving to 0.86 postrepair. There is a difference in instantaneous coronary flow rate with increasing aortic pressure in the ischemic models (slope 0.2846), compared to the postrepair and normal models (slope >0.53). These observations on patient models support a biomechanical basis for ischemia and potentially sudden cardiac death in aortic origin of a coronary artery, with a drop in pressure and FFR in the intramural segment, and a decrease in coronary flow rate with increasing aortic pressure, with both improving after corrective surgery.
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Affiliation(s)
- Hoda Hatoum
- Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia
| | - Rajesh Krishnamurthy
- Department of Radiology, Nationwide Children's Hospital, The Ohio State University College of Medicine, Columbus, Ohio..
| | - Jayanthi Parthasarathy
- Department of Radiology, Nationwide Children's Hospital, The Ohio State University College of Medicine, Columbus, Ohio
| | - Dorma C Flemister
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio
| | - Carly M Krull
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio
| | - Benjamin A Walter
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio
| | - Carlos M Mery
- Texas Center for Pediatric and Congenital Heart Disease, University of Texas Dell Medical School / Dell Children's Medical Center, Austin, Texas
| | - Silvana Molossi
- Section of Pediatric Cardiology, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, Texas
| | - Lakshmi Prasad Dasi
- Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia..
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14
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2020 ABME Paper Awards. Ann Biomed Eng 2020. [DOI: 10.1007/s10439-020-02690-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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15
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Hatoum H, Lilly S, Maureira P, Crestanello J, Prasad Dasi L. Sinus Hemodynamics After Transcatheter Aortic Valve in Transcatheter Aortic Valve. Ann Thorac Surg 2020; 110:1348-1356. [PMID: 32179042 PMCID: PMC11069388 DOI: 10.1016/j.athoracsur.2020.02.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2019] [Revised: 12/07/2019] [Accepted: 02/04/2020] [Indexed: 12/24/2022]
Abstract
BACKGROUND This study evaluated the effect of transcatheter aortic valve (TAV)-in-TAV on sinus hemodynamics and washout. With TAV becoming the standard procedure for aortic valve replacement and with the limited valve durability, a second intervention is necessary (TAV-in-TAV) after first TAV failure. METHODS Six arrangements of TAV-in-TAV were chosen for this study as follows: (1) Evolut 23 (Medtronic, Minneapolis, MN) in Evolut 26, (2) Evolut 23 in SAPIEN 3 23 (Edwards Lifesciences, Irvine, CA), (3) Evolut 26 in Evolut 26, (4) Evolut 26 in SAPIEN 23, (5) SAPIEN 3 23 in Evolut 26, and (6) SAPIEN 3 23 in SAPIEN 3 23. These TAV-in-TAV configurations were assessed in a pulse duplicator. Particle image velocimetry was performed. RESULTS During systole, (1) the highest velocity was found with SAPIEN-in-SAPIEN (0.7 m/s) and the lowest was with Evolut 26-in-Evolut 26 (0.2 m/s); (2) the highest shear stress magnitude near the leaflet was with Evolut 23-in-SAPIEN (1.45 Pa) and the lowest was with Evolut 26-in-Evolut 26 (0.55 Pa); and (3) washout was almost equal in all sinuses of these cases (<2.5 cycles). CONCLUSIONS This study shows that TAV-in-TAV is highly dependent on the valve that is originally implanted and the valve to be implanted. Washout is not significantly degraded after TAV-in-TAV compared with valve-in-valve and TAV replacement. Further studies are needed to optimize valve size and selection.
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Affiliation(s)
- Hoda Hatoum
- Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia
| | - Scott Lilly
- Division of Cardiovascular Medicine, The Ohio State University, Columbus, Ohio
| | - Pablo Maureira
- Department of Cardiovascular Surgery, Centre Hospitalier Universitaire de Nancy, Nancy, France
| | - Juan Crestanello
- Department of Cardiovascular Surgery, Mayo Clinic, Rochester, Minnesota
| | - Lakshmi Prasad Dasi
- Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia.
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16
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Influence of Patient-Specific Characteristics on Transcatheter Heart Valve Neo-Sinus Flow: An In Silico Study. Ann Biomed Eng 2020; 48:2400-2411. [PMID: 32415483 DOI: 10.1007/s10439-020-02532-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Accepted: 05/06/2020] [Indexed: 01/10/2023]
Abstract
Thrombosis in post-transcatheter aortic valve replacement (TAVR) patients has been correlated with flow stasis in the neo-sinus. This study investigated the effect of the post-TAVR geometry on flow stasis. Computed tomography angiography of 155 patients who underwent TAVR using a SAPIEN 3 were used to identify patients with and without thrombosis, and quantify thrombus volumes. Six patients with 23-mm SAPIEN 3 valves were then selected from the cohort and used to create patient-specific post-TAVR computational fluid dynamic models. Regions of flow stasis (%Volstasis, velocities below 0.05 m/s) were identified. The results showed that all post-TAVR anatomical measurements were significantly different in patients with and without thrombus, but only sinus diameter had a linear correlation with thrombus volume (r = 0.471, p = 0.008). A linear correlation was observed between %Volstasis and thrombus volume (r = 0.821, p = 0.007). The combination of anatomy and valve deployment created a unique geometry in each patient, which when combined with patient-specific cardiac output, resulted in distinct flow patterns. While parametric studies have shown individual anatomical or deployment metrics may relate to flow stasis, the combined effects of these metrics potentially contributes to the biomechanical environment promoting thrombosis, therefore hemodynamic studies of TAVR should account for these patient-specific factors.
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17
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Ali A, Ballard DH, Althobaity W, Christensen A, Geritano M, Ho M, Liacouras P, Matsumoto J, Morris J, Ryan J, Shorti R, Wake N, Rybicki FJ, Sheikh A. Clinical situations for which 3D printing is considered an appropriate representation or extension of data contained in a medical imaging examination: adult cardiac conditions. 3D Print Med 2020; 6:24. [PMID: 32965536 PMCID: PMC7510265 DOI: 10.1186/s41205-020-00078-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 09/04/2020] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Medical 3D printing as a component of care for adults with cardiovascular diseases has expanded dramatically. A writing group composed of the Radiological Society of North America (RSNA) Special Interest Group on 3D Printing (SIG) provides appropriateness criteria for adult cardiac 3D printing indications. METHODS A structured literature search was conducted to identify all relevant articles using 3D printing technology associated with a number of adult cardiac indications, physiologic, and pathologic processes. Each study was vetted by the authors and graded according to published guidelines. RESULTS Evidence-based appropriateness guidelines are provided for the following areas in adult cardiac care; cardiac fundamentals, perioperative and intraoperative care, coronary disease and ischemic heart disease, complications of myocardial infarction, valve disease, cardiac arrhythmias, cardiac neoplasm, cardiac transplant and mechanical circulatory support, heart failure, preventative cardiology, cardiac and pericardial disease and cardiac trauma. CONCLUSIONS Adoption of common clinical standards regarding appropriate use, information and material management, and quality control are needed to ensure the greatest possible clinical benefit from 3D printing. This consensus guideline document, created by the members of the RSNA 3D printing Special Interest Group, will provide a reference for clinical standards of 3D printing for adult cardiac indications.
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Affiliation(s)
- Arafat Ali
- Department of Radiology, University of Cincinnati Medical Center, Cincinnati, OH, USA.
| | - David H Ballard
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, Saint Louis, MO, USA
| | - Waleed Althobaity
- King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
| | - Andy Christensen
- Department of Radiology and The Ottawa Hospital Research Institute, University of Ottawa, Ottawa, ON, Canada
| | | | - Michelle Ho
- Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA
| | - Peter Liacouras
- 3D Medical Applications Center, Walter Reed National Military Medical Center, Washington, DC, USA
| | - Jane Matsumoto
- Department of Radiology, Mayo Clinic, Rochester, MN, USA
| | | | - Justin Ryan
- Rady Children's Hospital, San Diego, CA, USA
| | - Rami Shorti
- Intermountain Healthcare, South Jordan, UT, USA
| | - Nicole Wake
- Department of Radiology, Montefiore Medical Center, Bronx, NY, USA
| | - Frank J Rybicki
- Department of Radiology, University of Cincinnati Medical Center, Cincinnati, OH, USA
| | - Adnan Sheikh
- Department of Radiology and The Ottawa Hospital Research Institute, University of Ottawa, Ottawa, ON, Canada
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18
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Hatoum H, Maureira P, Lilly S, Dasi LP. Impact of Leaflet Laceration on Transcatheter Aortic Valve-in-Valve Washout: BASILICA to Solve Neosinus and Sinus Stasis. JACC Cardiovasc Interv 2020; 12:1229-1237. [PMID: 31272669 DOI: 10.1016/j.jcin.2019.04.013] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 03/26/2019] [Accepted: 04/09/2019] [Indexed: 11/17/2022]
Abstract
OBJECTIVES The aim of this study was to evaluate any potential leaflet washout benefits after bioprosthetic or native aortic scallop intentional laceration to prevent iatrogenic coronary artery obstruction during TAVR (BASILICA) in transcatheter valve-in-valve (ViV) in the context of leaflet thrombosis. BACKGROUND Leaflet thrombosis after transcatheter aortic valve replacement is secondary to flow stasis in both the sinus and neosinus. Strategies to improve washout and ameliorate neosinus and sinus flow velocities may have the potential to mitigate the occurrence of clinical and subclinical leaflet thrombosis. METHODS A 23-mm Edwards SAPIEN 3 and a 26-mm Medtronic Evolut were deployed in a 23-mm transparent surgical aortic valve model before and after leaflet laceration. The valves were placed in the aortic position of a pulse duplicator flow loop. Particle image velocimetry was performed to quantify sinus flow hemodynamic status. A tracing fluorescent dye was injected to evaluate the number of cycles to washout in both regions of interest. RESULTS The leaflet laceration procedure led to an increase in the velocities in the sinus and the neosinus by 50% for Evolut ViV and 61.9% for SAPIEN 3 ViV. In addition, leaflet laceration led to a reduction in overall cycles to washout in the neosinus by at least 56% with the Evolut and 54.5% with the SAPIEN 3 and in the sinus by at least 16.7% with the Evolut and 60.8% with the SAPIEN. CONCLUSIONS Leaflet laceration using a BASILICA-type approach may hold the potential to mitigate neosinus and sinus flow stasis. Controlled in vivo trials are necessary to establish the potential benefit of BASILICA to reduce the occurrence of leaflet thrombosis.
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Affiliation(s)
- Hoda Hatoum
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio
| | - Pablo Maureira
- Department of Cardiovascular Surgery, CHU de Nancy, Nancy, France
| | - Scott Lilly
- Division of Cardiovascular Medicine, The Ohio State University, Columbus, Ohio
| | - Lakshmi Prasad Dasi
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio.
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19
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Utility of Three-Dimensional (3D) Modeling for Planning Structural Heart Interventions (with an Emphasis on Valvular Heart Disease). Curr Cardiol Rep 2020; 22:125. [PMID: 32789652 DOI: 10.1007/s11886-020-01354-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
PURPOSE OF REVIEW Advanced imaging has played a vital role in the contemporary, rapid rise of structural heart interventions. 3D modeling and printing has emerged as one of the most recent imaging tools and the implementation of 3D modeling is expected to increase with further advances in imaging, print hardware, and materials. RECENT FINDINGS 3D modeling can be used to educate patients and clinical teams, provide ex vivo procedural simulation, and improve outcomes. Intra-procedural success rates may be improved, and post-procedural complications can be predicted more robustly with appropriate application of 3D modeling. Recent advances in technology have increased the availability of this tool, such that there can be more ready adoption into a routine clinical workflow. Familiarity with 3D modeling and its current utilization and role in structural interventions will help inform how to approach and adapt this exciting new technology.
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20
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Couture EL, Hovasse T, Troussier X, Magniez AD, Chevalier B. Sinus of Valsalva Thrombosis Following Transcatheter Aortic Valve Replacement in a Bicuspid Aortic Valve. JACC Cardiovasc Interv 2020; 13:1828-1830. [PMID: 32535002 DOI: 10.1016/j.jcin.2020.03.051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 03/27/2020] [Accepted: 03/31/2020] [Indexed: 11/15/2022]
Affiliation(s)
- Etienne L Couture
- Ramsay Générale de Santé, Institut Cardiovasculaire Paris Sud, Massy, France
| | - Thomas Hovasse
- Ramsay Générale de Santé, Institut Cardiovasculaire Paris Sud, Massy, France
| | - Xavier Troussier
- Ramsay Générale de Santé, Institut Cardiovasculaire Paris Sud, Massy, France
| | | | - Bernard Chevalier
- Ramsay Générale de Santé, Institut Cardiovasculaire Paris Sud, Massy, France.
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21
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Zakko J, Blum KM, Drews JD, Wu YL, Hatoum H, Russell M, Gooden S, Heitkemper M, Conroy O, Kelly J, Carey S, Sacks M, Texter K, Ragsdale E, Strainic J, Bocks M, Wang Y, Dasi LP, Armstrong AK, Breuer C. Development of Tissue Engineered Heart Valves for Percutaneous Transcatheter Delivery in a Fetal Ovine Model. JACC Basic Transl Sci 2020; 5:815-828. [PMID: 32875171 PMCID: PMC7452327 DOI: 10.1016/j.jacbts.2020.06.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 06/10/2020] [Accepted: 06/10/2020] [Indexed: 02/06/2023]
Abstract
A fully biodegradable fetal valve was developed using a zinc-aluminum alloy stent and electrospun PCL leaflets. In vitro evaluation of the valve was performed with accelerated degradation, mechanical, and flow loop testing, and the valve showed trivial stenosis and trivial regurgitation. A large animal model was used for percutaneous delivery of the valve to the fetal pulmonary annulus. Following implantation, the valve had no stenosis or regurgitation by echocardiography, and the fetal sheep matured and was delivered at term with the tissue-engineered valve.
This multidisciplinary work shows the feasibility of replacing the fetal pulmonary valve with a percutaneous, transcatheter, fully biodegradable tissue-engineered heart valve (TEHV), which was studied in vitro through accelerated degradation, mechanical, and hemodynamic testing and in vivo by implantation into a fetal lamb. The TEHV exhibited only trivial stenosis and regurgitation in vitro and no stenosis in vivo by echocardiogram. Following implantation, the fetus matured and was delivered at term. Replacing a stenotic fetal valve with a functional TEHV has the potential to interrupt the development of single-ventricle heart disease by restoring proper flow through the heart.
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Key Words
- EOA, effective orifice area
- MPA, main pulmonary artery
- Mn, molecular size
- Mw, molecular weight
- NOI, normalized orientation index
- PCL, polycaprolactone
- PDI, polydispersity index
- PG, pressure gradient
- RF, regurgitant fraction
- RV, right ventricular/ventricle
- SEM, scanning electron microscopy
- TEHV, tissue-engineered heart valve
- congenital heart disease
- tissue-engineered heart valve
- transcatheter heart valve
- translational medicine
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Affiliation(s)
- Jason Zakko
- Center for Regenerative Medicine, Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus, Ohio.,Department of Surgery, Ohio State University Wexner Medical Center, Columbus, Ohio
| | - Kevin M Blum
- Center for Regenerative Medicine, Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus, Ohio.,Department of Biomedical Engineering, Ohio State University, Columbus, Ohio
| | - Joseph D Drews
- Center for Regenerative Medicine, Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus, Ohio.,Department of Surgery, Ohio State University Wexner Medical Center, Columbus, Ohio
| | - Yen-Lin Wu
- Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York
| | - Hoda Hatoum
- Coulter Department of Biomedical Engineering, Georgia Tech, Atlanta, Georgia
| | - Madeleine Russell
- Oden Institute for Computational and Engineering Sciences, University of Texas at Austin, Austin, Texas
| | - Shelley Gooden
- Coulter Department of Biomedical Engineering, Georgia Tech, Atlanta, Georgia
| | - Megan Heitkemper
- Center for Regenerative Medicine, Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus, Ohio.,Department of Biomedical Engineering, Ohio State University, Columbus, Ohio
| | - Olivia Conroy
- Oden Institute for Computational and Engineering Sciences, University of Texas at Austin, Austin, Texas
| | - John Kelly
- Center for Regenerative Medicine, Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus, Ohio.,Heart Center, Nationwide Children's Hospital, Columbus, Ohio
| | - Stacey Carey
- Heart Center, Nationwide Children's Hospital, Columbus, Ohio
| | - Michael Sacks
- Oden Institute for Computational and Engineering Sciences, University of Texas at Austin, Austin, Texas
| | - Karen Texter
- Heart Center, Nationwide Children's Hospital, Columbus, Ohio
| | - Ellie Ragsdale
- Department of OB/GYN-Maternal Fetal Medicine, University Hospitals Cleveland Medical Center, Cleveland, Ohio
| | - James Strainic
- Department of Pediatric Cardiology, University Hospitals Rainbow Babies and Children's Hospital, School of Medicine, Case Western Reserve University, Cleveland, Ohio
| | - Martin Bocks
- University Hospitals Rainbow Babies and Children's Hospital, School of Medicine, Case Western Reserve University, Cleveland, Ohio
| | - Yadong Wang
- Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York
| | - Lakshmi Prasad Dasi
- Coulter Department of Biomedical Engineering, Georgia Tech, Atlanta, Georgia
| | | | - Christopher Breuer
- Center for Regenerative Medicine, Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus, Ohio.,Department of Surgery, Ohio State University Wexner Medical Center, Columbus, Ohio
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22
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Hatoum H, Gooden S, Heitkemper M, Blum KM, Zakko J, Bocks M, Yi T, Wu YL, Wang Y, Breuer CK, Dasi LP. Fetal Transcatheter Trileaflet Heart Valve Hemodynamics: Implications of Scaling on Valve Mechanics and Turbulence. Ann Biomed Eng 2020; 48:1683-1693. [PMID: 32052320 PMCID: PMC7286783 DOI: 10.1007/s10439-020-02475-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 02/05/2020] [Indexed: 01/09/2023]
Abstract
The scarcity of data available on the best approach for pulmonary fetal valve replacement or implantation necessitate an investigation on whether practices using adult transcatheter valves could be translated to fetal applications. The objective of this study is to evaluate the hemodynamic characteristics and the turbulent properties of a fetal sized trileaflet transcatheter pulmonary valve in comparison with an adult balloon-expandable valve in order to assess the possibility of designing valves for fetal applications using dynamic similarity. A 6 mm fetal trileaflet valve and a 26 mm SAPIEN 3 valve were assessed in a pulse duplicator. Particle image velocimetry was performed. Pressure gradient (ΔP), effective orifice area (EOA), regurgitant fractions (RF), pinwheeling indices (PI) and turbulent stresses were evaluated. ΔP was 8.56 ± 0.139 and 7.76 ± 0.083 mmHg with fetal valve and SAPIEN respectively (p < 0.0001); EOA was 0.10 ± 0.0007 and 2.1 ± 0.025 cm2 with fetal valve and SAPIEN respectively (p < 0.0001); RF with the fetal valve was 2.35 ± 1.99% and with SAPIEN 10.92 ± 0.11% (p < 0.0001); PI with fetal valve was 0.404 ± 0.01 and with SAPIEN 0.37 ± 0.07; The flow regime with the fetal valve was turbulent and Reynolds numbers reached about 7000 while those with the SAPIEN reached about 20,000 at peak velocity. Turbulent stresses were significantly higher with fetal valve compared with SAPIEN. Instantaneous viscous shear stresses with fetal valve were 5.8 times higher than those obtained with SAPIEN and Reynolds shear stresses were 2.5 times higher during peak systole. The fetal valve implantation leads to a turbulent flow (specific to this particular type and design of valve) regime unlike what is expected of a small valve with different flow properties compared to adult valves.
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Affiliation(s)
- Hoda Hatoum
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, 387 Technology Circle NW, Atlanta, GA, 30313, USA
| | - Shelley Gooden
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, 387 Technology Circle NW, Atlanta, GA, 30313, USA
| | - Megan Heitkemper
- Center for Regenerative Medicine, Tissue Engineering Program, The Research Institute at Nationwide Children's Hospital, Columbus, OH, USA
| | - Kevin M Blum
- Center for Regenerative Medicine, Tissue Engineering Program, The Research Institute at Nationwide Children's Hospital, Columbus, OH, USA
| | - Jason Zakko
- Center for Regenerative Medicine, Tissue Engineering Program, The Research Institute at Nationwide Children's Hospital, Columbus, OH, USA
| | - Martin Bocks
- Case Western Reserve University School of Medicine, UH Rainbow Babies & Children's Hospital, Cleveland, OH, USA
| | - Tai Yi
- Center for Regenerative Medicine, Tissue Engineering Program, The Research Institute at Nationwide Children's Hospital, Columbus, OH, USA
| | - Yen-Lin Wu
- Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY, USA
| | - Yadong Wang
- Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY, USA
| | - Christopher K Breuer
- Center for Regenerative Medicine, Tissue Engineering Program, The Research Institute at Nationwide Children's Hospital, Columbus, OH, USA
| | - Lakshmi Prasad Dasi
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, 387 Technology Circle NW, Atlanta, GA, 30313, USA.
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23
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Hatoum H, Girault E, Heim F, Dasi LP. In-vitro characterization of self-expandable textile transcatheter aortic valves. J Mech Behav Biomed Mater 2020; 103:103559. [PMID: 31786509 PMCID: PMC11107174 DOI: 10.1016/j.jmbbm.2019.103559] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 11/10/2019] [Accepted: 11/25/2019] [Indexed: 12/29/2022]
Abstract
OBJECTIVE This study aims at assessing the global dynamic behavior, closing energy and turbulence characteristics of self-expandable textile (inclined and straight yarn) transcatheter aortic valves (TAV) versus bioprosthetic TAVs. METHODS Two self-expandable textile TAVs one with inclined yarn textile and another with straight yarn textile leaflets were assessed in a pulse duplicator and compared with a self-expandable commercial bioprosthetic TAV under physiological pressure and flow. Particle Image Velocimetry and high-speed imaging were performed. Effective orifice areas (EOA), leakage fractions (LF), Pinwheeling indices (PI), closing energy (E), viscous shear stresses (VSS) and Reynolds shear stresses (RSS) were calculated. RESULTS (a) EOAs and LFs were 2.27 ± 0.03 cm2, 31.7 ± 0.6%; 2.25 ± 0.08 cm2, 26.6 ± 0.7%; and 1.63 ± 0.01 cm2, 29.1 ± 1.25% for inclined textile, bioprosthetic and straight textile TAV respectively (p < 0.0001). (b) Following same order, PIs were significantly different going from 1.16 ± 0.21%, 8.48 ± 0.8% and 8.865 ± 0.58% with the exception of CoreValve and straight yarn valve (p = 0.37); (c) E is lowest for straight textile TAV (0.0024 ± 0.0017 J), followed by bioprosthetic valve (0.00259 ± 0.0011 J) and then 45° Oriented Yarn Valve (0.00334 ± 0.03 J) (d) At peak systole, the highest RSS distribution was with the Straight textile TAV reaching up to 330Pa. The bioprosthetic TAV shows the smallest range with RSS reaching around 230Pa and the inclined textile TAV up to 280Pa. VSS limits were comparable among the 3 valves ranging between 5.2Pa and 5.7Pa. CONCLUSION Hemodynamic similarities were found between the textile self-expandable valves and the bioprosthetic valve. This study constitutes another step towards showing the potential that textile valves have to become an alternative for the biological ones.
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Affiliation(s)
- Hoda Hatoum
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, United States
| | - Elise Girault
- Laboratoire de Physique et Mécanique Textiles, Université de Haute Alsace, Mulhouse, France
| | - Frederic Heim
- Laboratoire de Physique et Mécanique Textiles, Université de Haute Alsace, Mulhouse, France
| | - Lakshmi Prasad Dasi
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, United States.
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Levin D, Mackensen GB, Reisman M, McCabe JM, Dvir D, Ripley B. 3D Printing Applications for Transcatheter Aortic Valve Replacement. Curr Cardiol Rep 2020; 22:23. [PMID: 32067112 DOI: 10.1007/s11886-020-1276-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
PURPOSE OF REVIEW A combination of evolving 3D printing technologies, new 3D printable materials, and multi-disciplinary collaborations have made 3D printing applications for transcatheter aortic valve replacement (TAVR) a promising tool to promote innovation, increase procedural success, and provide a compelling educational tool. This review synthesizes the knowledge via publications and our group's experience in this area that exemplify uses of 3D printing for TAVR. RECENT FINDINGS Patient-specific 3D-printed models have been used for TAVR pre-procedural device sizing, benchtop prediction of procedural complications, planning for valve-in-valve and bicuspid aortic valve procedures, and more. Recent publications also demonstrate how 3D printing can be used to test assumptions about why certain complications occur during THV implantation. Finally, new materials and combinations of existing materials are starting to bridge the large divide between current 3D material and cardiac tissue properties. Several studies have demonstrated the utility of 3D printing in understanding challenges of TAVR. Innovative approaches to benchtop testing and multi-material printing have brought us closer to being able to predict how a THV will interact with a specific patient's aortic anatomy. This work to date is likely to open the door for advancements in other areas of structural heart disease, such as interventions involving the mitral valve, tricuspid valve, and left atrial appendage.
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Affiliation(s)
- Dmitry Levin
- Division of Cardiology, Department of Medicine, University of Washington, Seattle, WA, USA
| | - G Burkhard Mackensen
- Division of Cardiothoracic Anesthesiology, Department of Anesthesiology and Pain Medicine, University of Washington, Seattle, WA, USA
| | - Mark Reisman
- Division of Cardiology, Department of Medicine, University of Washington, Seattle, WA, USA
| | - James M McCabe
- Division of Cardiology, Department of Medicine, University of Washington, Seattle, WA, USA
| | - Danny Dvir
- Division of Cardiology, Department of Medicine, University of Washington, Seattle, WA, USA
| | - Beth Ripley
- Department of Radiology, University of Washington, Seattle, WA, USA. .,Department of Radiology, VA Puget Sound Health Care System, Seattle, WA, USA.
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The hemodynamics of transcatheter aortic valves in transcatheter aortic valves. J Thorac Cardiovasc Surg 2019; 161:565-576.e2. [PMID: 31767355 DOI: 10.1016/j.jtcvs.2019.09.174] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 08/22/2019] [Accepted: 09/06/2019] [Indexed: 11/23/2022]
Abstract
BACKGROUND The durability of transcatheter aortic valves (TAVs) remains their greatest disadvantage, given that fixed tissue leaflets are not immune to structural degeneration from calcification and thrombosis. Therefore, a second intervention is necessary, especially given that TAV in low-risk patients has shown noninferior outcomes compared with surgery. This study aimed to assess the hemodynamic and turbulent properties of the flow downstream with different TAV-in-TAV configurations, to offer basic hemodynamic guidance for future interventions when currently implanted valves structurally degrade. METHODS Six TAV-in-TAV configurations were chosen: 23 mm Evolut-in-26 mm Evolut, 23 mm Evolut-in-23 mm SAPIEN 3, 26 mm Evolut-in-26 mm Evolut, 26 mm Evolut-in-23 mm SAPIEN 3, 23 mm SAPIEN3-in-26 mm Evolut, and 23 mm SAPIEN3-in-23 mm SAPIEN 3. Their hemodynamic performance was assessed in a pulse duplicator for 100 cycles. High-speed imaging and particle image velocimetry were performed to assess turbulence. Effective orifice area (EOA), pinwheeling index (PI), and Reynolds shear stress (RSS) were evaluated. RESULTS The largest mean EOA was obtained with 23 mm SAPIEN-in-26 mm Evolut (2.07 ± 0.06 cm2), and the smallest was obtained with 23 mm Evolut-in-23 mm SAPIEN (1.50 ± 0.04 cm2) (P < .001). The highest mean PI was obtained with SAPIEN-in-SAPIEN (26.5 ± 2.00%), and the lowest was obtained with 26 mm Evolut-in-26 mm Evolut (7.5 ± 1.6%) (P < .01). At peak systole, the least detrimental RSS range was obtained with 23 mm Evolut-in-26 mm Evolut (up to ∼340 Pa), and the most detrimental RSS range was obtained with 23 mm Evolut-in-SAPIEN (∼900 Pa) (P < .01). CONCLUSIONS This study shows that best hemodynamic parameters are TAV-specific (implanted and to be implanted). In addition, it shows that RSS levels, which are indicative of turbulence levels and associated with blood damage, are 2- to 3-fold higher after TAV-in-TAV.
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Time and Change: The Importance of Innovation and Leadership to the Future of Surgery. Ann Surg 2019; 270:391-399. [PMID: 31283564 DOI: 10.1097/sla.0000000000003457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Heitkemper M, Hatoum H, Dasi LP. In vitro hemodynamic assessment of a novel polymeric transcatheter aortic valve. J Mech Behav Biomed Mater 2019; 98:163-171. [PMID: 31238208 DOI: 10.1016/j.jmbbm.2019.06.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2019] [Revised: 06/06/2019] [Accepted: 06/17/2019] [Indexed: 01/12/2023]
Abstract
Transcatheter aortic valve replacement (TAVR) is a life-saving alternative to surgical intervention. However, the identification of features associated with poor outcomes, including residual paravalvular leakage (PVL), leaflet calcification, and subclinical leaflet thrombosis, are cause to be concerned about valve durablilty (Mylotte and Piazza, 2015a, 2015b; Dasi et al., 2017; Makkar et al., 2015; Kheradvar et al., 2015a). The aim of this study is to optimize the potential of a hyaluronan (HA) enhanced polymeric transcatheter aortic valve (HA-TAV) that has promised to reduce blood damage causing-turbulent flow while maintaining durability. HA-enhanced linear low-density polyethylene (LLDPE) leaflets were sutured to novel cobalt chromium stents, size 26 mm balloon expandable stents. Hemodynamic performance was assessed in a left heart simulator under physiological pressure and flow conditions and compared to a 26 mm Medtronic Evolut and 26 mm Edwards SAPIEN 3. High-speed imaging and particle image velocimetry (PIV) were performed. The HA-TAV demonstrated an effective orifice area (EOA) within one standard deviation of the leading valve, SAPIEN 3.The regurgitant fraction (RF) of the HA-TAV (11.23 ± 0.55%) is decreased in comparison the Evolut (15.74 ± 0.73%) and slightly higher than the SAPIEN 3 (10.92 ± 0.11%), which is considered trace regurgitation according to valve standards. A decreased number of higher principal Reynolds shear stresses were shown for the HA-TAV at each cardiac phase. The HA-TAV is directly comparable and in some cases superior to the leading commercially available prosthetic heart valves in in-vitro hemodynamic testing.
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Affiliation(s)
- Megan Heitkemper
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA
| | - Hoda Hatoum
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA; Department of Mechanical Engineering, The Ohio State University, Columbus, OH, USA
| | - Lakshmi Prasad Dasi
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH, USA.
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Hatoum H, Maureira P, Dasi LP. A turbulence in vitro assessment of On-X and St Jude Medical prostheses. J Thorac Cardiovasc Surg 2019; 159:88-97. [PMID: 30905419 PMCID: PMC6703975 DOI: 10.1016/j.jtcvs.2019.02.046] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 01/17/2019] [Accepted: 02/09/2019] [Indexed: 02/08/2023]
Abstract
OBJECTIVE The objective of this study was to investigate and compare the hemodynamic and turbulence characteristics upon implantation of St Jude Medical (SJM) (St Jude Medical, St Paul, Minn) and On-X (On-X Life Technologies, Kennesaw, Ga) bileaflet mechanical valves. Both valves are considered highly successful bileaflet mechanical valves characterized by good clinical outcomes despite their numerous design differences. Although thromboembolism remains the main disadvantage of bileaflet mechanical valves, On-X valves have been shown to need less anticoagulation therapy. METHODS Hemodynamic assessment of a 23-mm On-X bileaflet mechanical valve and a 23-mm bileaflet SJM valve implanted in an aortic root was performed under pulsatile physiologic conditions. Time-resolved and phase-locked particle-image-velocimetry images and high-speed imaging data were acquired. Pressure gradients, effective orifice areas, dimensionless area index, leaflet position tracking, velocity, and principal Reynolds shear stress were calculated. RESULTS Pressure gradient for the On-X valve was 4.15 ± 0.099 mm Hg versus 4.75 ± 0.048 mm Hg for SJM (P < .001). Effective orifice area for the On-X valve was 2.61 ± 0.045 cm2 versus 2.36 ± 0.022 cm2 for SJM (P < .001). Area index was higher with SJM (0.87 ± 0.008) than with On-X (0.73 ± 0.013) (P < .001). On-X showed fluctuating leaflet behavior during systole, whereas SJM leaflets were stable. At peak systole, the maximal velocity with On-X was 1.86 m/s versus 2.33 m/s with SJM. Reynolds shear stress was higher with On-X compared with SJM at peak systole (95 vs 72 Pa). Higher velocity fluctuation was noted with the On-X valve. CONCLUSIONS This study shows that despite the design differences that characterize the On-X valve, the hemodynamic and turbulence parameters were not necessarily improved compared with SJM.
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Affiliation(s)
- Hoda Hatoum
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio
| | - Pablo Maureira
- Department of Cardiovascular Surgery, CHU de Nancy, Nancy, France
| | - Lakshmi Prasad Dasi
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio.
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Hatoum H, Dasi LP. Spatiotemporal Complexity of the Aortic Sinus Vortex as a Function of Leaflet Calcification. Ann Biomed Eng 2019; 47:1116-1128. [PMID: 30710186 DOI: 10.1007/s10439-019-02224-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 01/28/2019] [Indexed: 01/25/2023]
Abstract
Several studies have shown the variation of aortic sinus structures' hemodynamics with different flow and geometric characteristics. They have also correlated aortic sinus hemodynamics with the progression and evolution of calcific aortic valve disease (CAVD). This study aims at visualizing aortic sinus fluid structure variations as functions of different leaflet calcification degrees and assessing their potential relationship with CAVD. A degenerated 23 mm Carpentier-Edwards Perimount Magna valve extracted from a redo-surgery patient was implanted in an aortic root model and tested in a pulse duplicator left heart simulator. The valve has 3 leaflets with 3 different levels of calcium distribution: mild, moderate and severe. High-speed imaging and particle image velocimetry were performed to assess sinus vortices, leaflet tip position and velocity along with shear stress. Results have shown that (a) aortic sinus vortices initiation, entrapment and evolution varied with different calcified leaflet exposure; (b) higher velocities in the sinus were calculated with the mildly calcified leaflet compared to the moderately and severely calcified ones; (c) during systole, the mildly calcified leaflet sinus case shows the most spread-out and higher ranges of shear stress probabilities and highest magnitudes going from (- 1.5 to + 1.8 Pa) compared with (- 1.0 to + 1.0 Pa) for moderately and severely calcified leaflets. The higher the calcification degree the lower the shear stress range and likelihoods of having higher shear stress. This holds in diastole as well. This study shows the impact of calcification on the aortic sinus flow structures.
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Affiliation(s)
- Hoda Hatoum
- Department of Biomedical Engineering, The Ohio State University, 473 W 12th Ave, Columbus, OH, 43210, USA
| | - Lakshmi Prasad Dasi
- Department of Biomedical Engineering, The Ohio State University, 473 W 12th Ave, Columbus, OH, 43210, USA. .,Division of Cardiac Surgery, The Ohio State University, Columbus, OH, USA.
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Rotman OM, Bianchi M, Ghosh RP, Kovarovic B, Bluestein D. Principles of TAVR valve design, modelling, and testing. Expert Rev Med Devices 2018; 15:771-791. [PMID: 30318937 DOI: 10.1080/17434440.2018.1536427] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
INTRODUCTION Transcatheter aortic valve replacement (TAVR) has emerged as an effective minimally-invasive alternative to surgical valve replacement in medium- to high-risk, elderly patients with calcific aortic valve disease and severe aortic stenosis. The rapid growth of the TAVR devices market has led to a high variety of designs, each aiming to address persistent complications associated with TAVR valves that may hamper the anticipated expansion of TAVR utility. AREAS COVERED Here we outline the challenges and the technical demands that TAVR devices need to address for achieving the desired expansion, and review design aspects of selected, latest generation, TAVR valves of both clinically-used and investigational devices. We further review in detail some of the up-to-date modeling and testing approaches for TAVR, both computationally and experimentally, and additionally discuss those as complementary approaches to the ISO 5840-3 standard. A comprehensive survey of the prior and up-to-date literature was conducted to cover the most pertaining issues and challenges that TAVR technology faces. EXPERT COMMENTARY The expansion of TAVR over SAVR and to new indications seems more promising than ever. With new challenges to come, new TAV design approaches, and materials used, are expected to emerge, and novel testing/modeling methods to be developed.
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Affiliation(s)
- Oren M Rotman
- a Department of Biomedical Engineering , Stony Brook University , Stony Brook , NY , USA
| | - Matteo Bianchi
- a Department of Biomedical Engineering , Stony Brook University , Stony Brook , NY , USA
| | - Ram P Ghosh
- a Department of Biomedical Engineering , Stony Brook University , Stony Brook , NY , USA
| | - Brandon Kovarovic
- a Department of Biomedical Engineering , Stony Brook University , Stony Brook , NY , USA
| | - Danny Bluestein
- a Department of Biomedical Engineering , Stony Brook University , Stony Brook , NY , USA
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Hatoum H, Dasi LP. Reduction of Pressure Gradient and Turbulence Using Vortex Generators in Prosthetic Heart Valves. Ann Biomed Eng 2018; 47:85-96. [PMID: 30209706 DOI: 10.1007/s10439-018-02128-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Accepted: 09/10/2018] [Indexed: 11/30/2022]
Abstract
Blood damage and platelet activation are inherent problems with present day bi-leaflet mechanical heart valve designs. Passive flow control through different arrangements of vortex generators (VG) as means of improving pressure gradients and reducing turbulence are investigated. Rectangular VG arrays were mounted on the downstream surfaces of a 23 mm 3D printed mechanical valve. The effect of VGs on the resulting flow structures were assessed under pulsatile physiological flow conditions where high resolution particle image velocimetry measurement was performed. The co-rotating VGs showed lower Reynolds shear stresses and improved pressure gradients (PG) compared with the counter-rotating ones and the no-VG control one (that showed higher turbulence). RSS was found 38.13 ± 0.89, 12.95 ± 0.32, 15.75 ± 0.71, 24.54 ± 0.84 and 16.33 ± 0.58 Pa for the control, co-rotating VGs, 8 counter-rotating VGs, 4 far-spaced VGs and 4 closely-spaced VGs, respectively. PG of 10.45 ± 0.94 mmHg was obtained with co-rotating VGs and the difference was significant compared with the other configurations (control 14.88 ± 0.4 mmHg; 8 counter-rotating VGs 13.76 ± 0.51 mmHg; 4 far-spaced VGs 13.84 ± 0.09 mmHg; and 4 closely-spaced VGs 15.37 ± 0.16 mmHg). Co-rotating VGs for this application induce a more delayed flow separation and a more homogenized and streamlined transition of flow compared with the counter-rotating VGs. Passive flow control techniques deployed on BHMVs is potentially beneficial as significant control of flow at small length scales without inducing large-scale design modifications of the valve.
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Affiliation(s)
- Hoda Hatoum
- Department of Biomedical Engineering, The Ohio State University, 473W 12th Ave., Columbus, OH, 43210, USA
| | - Lakshmi P Dasi
- Department of Biomedical Engineering, The Ohio State University, 473W 12th Ave., Columbus, OH, 43210, USA.
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