1
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Morimura H, Okamoto Y, Takada J, Tabata M, Iwasaki K. Repairable ex vivo model of functional and degenerative mitral regurgitation. Eur J Cardiothorac Surg 2023; 64:ezad371. [PMID: 37951590 PMCID: PMC10903162 DOI: 10.1093/ejcts/ezad371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 10/19/2023] [Accepted: 11/08/2023] [Indexed: 11/14/2023] Open
Abstract
OBJECTIVES Transcatheter mitral valve repair is an emerging alternative to the surgical repair. This technology requires preclinical studies to assess efficacy in mitigating mitral regurgitation (MR). However, ex vivo MR models are not established. We developed 2 novel repairable models, functional and degenerative, which can quantitatively assess regurgitation and effect of intervention. METHODS We used porcine mitral valves and a pulsatile flow circulation system. In the functional MR model, the annulus was immersed in 0.1% collagenase solution and dilated using 3D-printed dilators. To control the regurgitation grade, the sizes of the dilator and silicone sheet in which the valve was sutured to were adjusted. Chordae of P2 were severed in the degenerative model, and the number of severed chordae was adjusted to control the regurgitation grade. Models were repaired using the edge-to-edge or artificial chordae technique. RESULTS The mean regurgitant fraction of the moderate-severe functional and degenerative models were 47.9% [standard deviation (SD): 2.2%] and 58.5% (SD: 8.0%), which were significantly reduced to 28.7% (SD: 4.4%) (P < 0.001) and 26.0% (SD: 4.4%) (P < 0.001) after the valve repair procedures. Severe functional model had a mean regurgitant fraction of 59.4% (SD: 6.0%). CONCLUSIONS Both functional and degenerative models could produce sufficient MR levels that meet the interventional indication criteria. The repairable models are valuable in evaluating the efficacy of valve repair procedures and devices. The ability to control the amount of regurgitation enhances the versatility and reliability of these models. These reproducible models could expedite the development of novel devices.
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Affiliation(s)
- Hayato Morimura
- Cooperative Major in Advanced Biomedical Sciences, Joint Graduate School of Tokyo Women's Medical University and Waseda University, Waseda University, Tokyo, Japan
| | - Yusei Okamoto
- Department of Modern Mechanical Engineering, Graduate School of Creative Science and Engineering, Waseda University, Tokyo, Japan
| | - Jumpei Takada
- Department of Integrative Bioscience and Biomedical Engineering, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo, Japan
| | - Minoru Tabata
- Department of Cardiovascular Surgery, Juntendo University, Tokyo, Japan
| | - Kiyotaka Iwasaki
- Cooperative Major in Advanced Biomedical Sciences, Joint Graduate School of Tokyo Women's Medical University and Waseda University, Waseda University, Tokyo, Japan
- Department of Modern Mechanical Engineering, Graduate School of Creative Science and Engineering, Waseda University, Tokyo, Japan
- Department of Integrative Bioscience and Biomedical Engineering, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo, Japan
- Institute for Medical Regulatory Science, Waseda University, Tokyo, Japan
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2
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Onohara D, Suresh KS, Silverman M, He Q, Kono T, Padala M. Image-Guided Targeted Mitral Valve Tethering with Chordal Encircling Snares as a Preclinical Model of Secondary Mitral Regurgitation. J Cardiovasc Transl Res 2022; 15:653-665. [PMID: 34618333 PMCID: PMC10797638 DOI: 10.1007/s12265-021-10177-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 09/23/2021] [Indexed: 10/20/2022]
Abstract
Development of transcatheter mitral valve interventions has ushered a significant need for large animal models of secondary mitral regurgitation. Though currently used heart failure models that chronically develop secondary mitral regurgitation are viable, the severity is lower than patients, the incubation time is long, and mortality is high. We sought to develop a swine model of acute secondary mitral regurgitation that uses image-guided placement of snares around the mitral chordae. Twenty-seven adult swine (n = 27) were assigned to secondary mitral regurgitation induced by valve tethering with image-guided chordal encircling snares (group 1, n = 7, tether MR (tMR)); secondary mitral regurgitation by percutaneous posterolateral myocardial infarction causing ventricular dysfunction and regurgitation (group 2, n = 6, functional MR (fMR)); and control animals (group 3, n = 14). Regurgitant fraction in tMR was 42.1 ± 14.2%, in fMR was 22 ± 9.6%, and in controls was 5.3 ± 3.8%. Mitral tenting height was 9.6 ± 1.3 mm in tMR, 10.1 ± 1.5 mm in fMR, and 5.8 ± 1.2 mm in controls. Chordal encircling tethers reproducibly induce clinically relevant levels of secondary mitral regurgitation, providing a new animal model for use in translational research.
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Affiliation(s)
- Daisuke Onohara
- Structural Heart Research and Innovation Laboratory, Carlyle Fraser Heart Center, Emory University Hospital Midtown, Atlanta, GA, USA
- Division of Cardiothoracic Surgery, Emory University School of Medicine, Atlanta, GA, USA
| | - Kirthana Sreerangathama Suresh
- Structural Heart Research and Innovation Laboratory, Carlyle Fraser Heart Center, Emory University Hospital Midtown, Atlanta, GA, USA
| | - Michael Silverman
- Structural Heart Research and Innovation Laboratory, Carlyle Fraser Heart Center, Emory University Hospital Midtown, Atlanta, GA, USA
| | - Qi He
- Structural Heart Research and Innovation Laboratory, Carlyle Fraser Heart Center, Emory University Hospital Midtown, Atlanta, GA, USA
| | - Takanori Kono
- Structural Heart Research and Innovation Laboratory, Carlyle Fraser Heart Center, Emory University Hospital Midtown, Atlanta, GA, USA
| | - Muralidhar Padala
- Structural Heart Research and Innovation Laboratory, Carlyle Fraser Heart Center, Emory University Hospital Midtown, Atlanta, GA, USA.
- Division of Cardiothoracic Surgery, Emory University School of Medicine, Atlanta, GA, USA.
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3
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Romagnoni C, Contino M, Jaworek M, Rosa R, Salurso E, Perico F, Gelpi G, Vismara R, Fiore GB, Mangini A, Antona C. Commissural repositioning in bicuspid aortic valve repair: an in vitro acute model to explore and explain different results. Eur J Cardiothorac Surg 2021; 61:647-654. [PMID: 34363669 DOI: 10.1093/ejcts/ezab359] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 06/10/2021] [Accepted: 06/17/2021] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVES Commissural orientation <160° is a recognized risk factor for bicuspid aortic valve repair failure. Based on this observation, repairing this subtype of aortic valve by reorienting the 2 commissures at 180° has recently been proposed. METHODS Nine porcine hearts with aortic annulus diameters of 25 mm were selected. A pathological model of a Sievers 1 bicuspid aortic valve was obtained by suturing the coaptation line between the left and right leaflets. Each heart underwent reimplantation procedures both in the native (120°) and the reoriented (180°) configuration. After the operation, each sample was tested on a pulse duplicator at rest (heart rate 60 beats per min) and with mild exercise (heart rate 90 beats per min) conditions. RESULTS No statistically significant difference was noted in mean and peak transvalvular aortic gradients between the 2 configurations at rest (18.6 ± 5 vs 17.5 ± 4 for the mean aortic gradient; 42.8 ± 12.7 vs 36.3 ± 5.8 for the peak aortic gradient) but the group with the 120°-oriented commissures had significantly higher mean transaortic gradients compared to the group with the 180°-oriented commissures at initial exercise stress conditions (30.1 ± 9.1 vs 24.9 ± 3.8; p value 0.002). CONCLUSIONS The 180° commissural reorientation of the asymmetrical bicuspid aortic valve does not improve the transvalvular aortic gradient in an acute model at rest conditions, but it could do so under stress situations. Even if it is surgically more complex and time-consuming, this approach could be a good strategy to improve long-term results, particularly in young patients.
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Affiliation(s)
- Claudia Romagnoni
- Cardiovascular Surgery Department, ASST Fatebenefratelli Sacco, Milano, Italy.,ForcardioLab-Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milano, Italy
| | - Monica Contino
- Cardiovascular Surgery Department, ASST Fatebenefratelli Sacco, Milano, Italy.,ForcardioLab-Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milano, Italy
| | - Michal Jaworek
- ForcardioLab-Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milano, Italy.,Department of Electronics, Information and Bioengineering, Politecnico di Milano, Milano, Italy
| | - Rubina Rosa
- Cardiovascular Surgery Department, ASST Fatebenefratelli Sacco, Milano, Italy.,ForcardioLab-Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milano, Italy
| | - Eleonora Salurso
- ForcardioLab-Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milano, Italy.,Department of Electronics, Information and Bioengineering, Politecnico di Milano, Milano, Italy
| | - Francesca Perico
- ForcardioLab-Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milano, Italy.,Department of Electronics, Information and Bioengineering, Politecnico di Milano, Milano, Italy
| | - Guido Gelpi
- Cardiovascular Surgery Department, ASST Fatebenefratelli Sacco, Milano, Italy.,ForcardioLab-Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milano, Italy.,Department of Electronics, Information and Bioengineering, Politecnico di Milano, Milano, Italy
| | - Riccardo Vismara
- ForcardioLab-Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milano, Italy.,Department of Electronics, Information and Bioengineering, Politecnico di Milano, Milano, Italy
| | - Gianfranco Beniamino Fiore
- ForcardioLab-Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milano, Italy.,Department of Electronics, Information and Bioengineering, Politecnico di Milano, Milano, Italy
| | - Andrea Mangini
- Cardiovascular Surgery Department, ASST Fatebenefratelli Sacco, Milano, Italy.,ForcardioLab-Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milano, Italy
| | - Carlo Antona
- Cardiovascular Surgery Department, ASST Fatebenefratelli Sacco, Milano, Italy.,ForcardioLab-Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milano, Italy.,Università degli Studi di Milano, Milano, Italy
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Pasrija C, Quinn R, Ghoreishi M, Eperjesi T, Lai E, Gorman RC, Gorman JH, Gorman RC, Pouch A, Cortez FV, D'Ambra MN, Gammie JS. A Novel Quantitative Ex Vivo Model of Functional Mitral Regurgitation. INNOVATIONS-TECHNOLOGY AND TECHNIQUES IN CARDIOTHORACIC AND VASCULAR SURGERY 2021; 15:329-337. [PMID: 32830572 DOI: 10.1177/1556984520930336] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
OBJECTIVE Durability of mitral valve (MV) repair for functional mitral regurgitation (FMR) remains suboptimal. We sought to create a highly reproducible, quantitative ex vivo model of FMR that functions as a platform to test novel repair techniques. METHODS Fresh swine hearts (n = 10) were pressurized with air to a left ventricular pressure of 120 mmHg. The left atrium was excised and the altered geometry of FMR was created by radially dilating the annulus and displacing the papillary muscle tips apically and radially in a calibrated fashion. This was continued in a graduated fashion until coaptation was exhausted. Imaging of the MV was performed with a 3-dimensional (3D) structured-light scanner, which records 3D structure, texture, and color. The model was validated using transesophageal echocardiography in patients with normal MVs and severe FMR. RESULTS Compared to controls, the anteroposterior diameter in the FMR state increased 32% and the annular area increased 35% (P < 0.001). While the anterior annular circumference remained fixed, the posterior circumference increased by 20% (P = 0.026). The annulus became more planar and the tenting height increased 56% (9 to 14 mm, P < 0.001). The median coaptation depth significantly decreased (anterior leaflet: 5 vs 2 mm; posterior leaflet: 7 vs 3 mm, P < 0.001). The ex vivo normal and FMR models had similar characteristics as clinical controls and patients with severe FMR. CONCLUSIONS This novel quantitative ex vivo model provides a simple, reproducible, and inexpensive benchtop representation of FMR that mimics the systolic valvular changes of patients with FMR.
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Affiliation(s)
- Chetan Pasrija
- 12264 Division of Cardiac Surgery, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Rachael Quinn
- 12264 Division of Cardiac Surgery, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Mehrdad Ghoreishi
- 12264 Division of Cardiac Surgery, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Thomas Eperjesi
- 6572 Department of Surgery, University of Pennsylvania, PA, USA
| | - Eric Lai
- 6572 Department of Surgery, University of Pennsylvania, PA, USA
| | - Robert C Gorman
- 6572 Department of Surgery, University of Pennsylvania, PA, USA
| | - Joseph H Gorman
- 6572 Department of Surgery, University of Pennsylvania, PA, USA
| | - Robert C Gorman
- 6572 Department of Surgery, University of Pennsylvania, PA, USA
| | - Alison Pouch
- 6572 Department of Surgery, University of Pennsylvania, PA, USA
| | - Felino V Cortez
- 12264 Division of Cardiac Surgery, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Michael N D'Ambra
- 12264 Division of Cardiac Surgery, University of Maryland School of Medicine, Baltimore, MD, USA
| | - James S Gammie
- 12264 Division of Cardiac Surgery, University of Maryland School of Medicine, Baltimore, MD, USA
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5
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Computational Analysis of Virtual Echocardiographic Assessment of Functional Mitral Regurgitation for Validation of Proximal Isovelocity Surface Area Methods. J Am Soc Echocardiogr 2021; 34:1211-1223. [PMID: 34214636 DOI: 10.1016/j.echo.2021.06.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 06/14/2021] [Accepted: 06/16/2021] [Indexed: 12/13/2022]
Abstract
BACKGROUND Mitral regurgitation (MR) quantification by the proximal isovelocity surface area (PISA) method remains challenging. Using computer models, the authors evaluated the accuracy of different PISA methods and quantified their errors. METHODS Five functional MR computer models of different geometric and tethering abnormalities were created, validated, and treated as phantom models, from which the reference values were directly obtained. Virtual two-dimensional (2D) PISA and three-dimensional (3D) PISA (both peak and integrated values) were performed on these phantom models. By comparing virtual PISA results with reference values, the accuracy of different PISA methods was evaluated, and their sources of errors were quantified. RESULTS Compared with reference values of regurgitant flow rate, excellent correlations were found for true PISA (r = 0.99, bias = 32.3 ± 35.3 mL/sec), 3D PISA (r = 0.97, bias = -24.4 ± 55.5 mL/sec), followed by multiplane 2D hemicylindrical PISA (r = 0.88, bias = -24.1 ± 85.4 mL/sec) and hemiellipsoidal PISA (r = 0.91, bias = -55.7 ± 96.6 mL/sec). Weaker correlations were found for single-plane 2D hemispherical PISA (parasternal long-axis: r = 0.71, bias = -77.6 ± 124.5 mL/sec; apical two-chamber: r = 0.69, bias = -52.0 ± 122.0 mL/sec; apical four-chamber: r = 0.82, bias = -65.5 ± 107.3 mL/sec). For regurgitant volume quantification, integrated PISA was more accurate than peak PISA. The bias of 3D PISA improved from -12.7 ± 7.8 mL (peak PISA) to -2.1 ± 5.3 mL (integrated PISA). CONCLUSIONS For functional MR quantification, 2D hemispherical PISA had significant underestimation, multiplane 2D hemiellipsoidal and hemicylindrical PISA showed improved accuracy, and 3D PISA was the most accurate. The PISA method is subject to both systematic underestimation due to the Doppler angle effect and systematic overestimation when regurgitant flow is not perpendicular to PISA contour. Integrated PISA is able to capture dynamic MR and is therefore more accurate than peak PISA. The sum of regurgitant flow rates is the most feasible way to perform integrated PISA.
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6
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Jaworek M, Mangini A, Maroncelli E, Lucherini F, Rosa R, Salurso E, Votta E, Antona C, Fiore GB, Vismara R. Ex Vivo Model of Functional Mitral Regurgitation Using Deer Hearts. J Cardiovasc Transl Res 2020; 14:513-524. [PMID: 32959169 PMCID: PMC8219575 DOI: 10.1007/s12265-020-10071-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Accepted: 09/07/2020] [Indexed: 12/21/2022]
Abstract
Transcatheter therapies are emerging for functional mitral regurgitation (FMR) treatment, however there is lack of pathological models for their preclinical assessment. We investigated the applicability of deer hearts for this purpose. 8 whole deer hearts were housed in a pulsatile flow bench. At baseline, all mitral valves featured normal coaptation. The pathological state was induced by 60-minutes intraventricular constant pressurization. It caused mitral annulus dilation (antero-posterior diameter increase from 31.8 ± 5.6 mm to 39.5 ± 4.9 mm, p = 0.001), leaflets tethering (maximal tenting height increase from 7.3 ± 2.5 mm to 12.7 ± 3.4 mm, p < 0.001) and left ventricular diameter increase (from 67.8 ± 7.5 mm to 79.4 ± 6.5 mm, p = 0.004). These geometrical reconfigurations led to restricted mitral valve leaflets motion and leaflet coaptation loss. Preliminary feasibility assessment of two FMR treatments was performed in the developed model. Deer hearts showed ability to dilate under constant pressurization and have potential to be used for realistic preclinical research of novel FMR therapies. Graphical abstract figure legend: Deer heart mitral valve fiberscopic and echocardiographic images in peak systole at baseline and after inducing the pathological conditions representing functional mitral regurgitation. In the pathological conditions lack of coaptation between the leaflets, enlargement of the antero-posterior distance (red dashed line) and the left ventricular diameter (orange dashed line) were observed. ![]()
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Affiliation(s)
- Michal Jaworek
- Department of Electronics, Information and Bioengineering, Politecnico di Milano, Via Golgi 39, 20133, Milan, Italy. .,ForcardioLab - Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milan, Italy.
| | - Andrea Mangini
- ForcardioLab - Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milan, Italy.,Cardiovascular Surgery Department, ASST Fatebenefratelli Luigi Sacco University Hospital, Milan, Italy
| | - Edoardo Maroncelli
- Department of Electronics, Information and Bioengineering, Politecnico di Milano, Via Golgi 39, 20133, Milan, Italy
| | - Federico Lucherini
- Department of Electronics, Information and Bioengineering, Politecnico di Milano, Via Golgi 39, 20133, Milan, Italy.,ForcardioLab - Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milan, Italy
| | - Rubina Rosa
- ForcardioLab - Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milan, Italy.,Cardiovascular Surgery Department, ASST Fatebenefratelli Luigi Sacco University Hospital, Milan, Italy
| | - Eleonora Salurso
- Department of Electronics, Information and Bioengineering, Politecnico di Milano, Via Golgi 39, 20133, Milan, Italy
| | - Emiliano Votta
- Department of Electronics, Information and Bioengineering, Politecnico di Milano, Via Golgi 39, 20133, Milan, Italy.,3D and Computer Simulation Laboratory, IRCCS Policlinico San Donato, San Donato Milanese, Italy
| | - Carlo Antona
- ForcardioLab - Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milan, Italy.,Cardiovascular Surgery Department, ASST Fatebenefratelli Luigi Sacco University Hospital, Milan, Italy.,Università degli Studi di Milano, Milan, Italy
| | - Gianfranco Beniamino Fiore
- Department of Electronics, Information and Bioengineering, Politecnico di Milano, Via Golgi 39, 20133, Milan, Italy.,ForcardioLab - Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milan, Italy
| | - Riccardo Vismara
- Department of Electronics, Information and Bioengineering, Politecnico di Milano, Via Golgi 39, 20133, Milan, Italy.,ForcardioLab - Fondazione per la Ricerca in Cardiochirurgia ONLUS, Milan, Italy
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7
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A novel 3D-Printed preferential posterior mitral annular dilation device delineates regurgitation onset threshold in an ex vivo heart simulator. Med Eng Phys 2020; 77:10-18. [PMID: 32008935 DOI: 10.1016/j.medengphy.2020.01.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 12/21/2019] [Accepted: 01/12/2020] [Indexed: 12/17/2022]
Abstract
Mitral regurgitation (MR) due to annular dilation occurs in a variety of mitral valve diseases and is observed in many patients with heart failure due to mitral regurgitation. To understand the biomechanics of MR and ultimately design an optimized annuloplasty ring, a representative disease model with asymmetric dilation of the mitral annulus is needed. This work shows the design and implementation of a 3D-printed valve dilation device to preferentially dilate the posterior mitral valve annulus. Porcine mitral valves (n = 3) were sewn into the device and mounted within a left heart simulator that generates physiologic pressures and flows through the valves, while chordal forces were measured. The valves were incrementally dilated, inducing MR, while hemodynamic and force data were collected. Flow analysis demonstrated that MR increased linearly with respect to percent annular dilation when dilation was greater than a 25.6% dilation threshold (p < 0.01). Pre-threshold, dilation did not cause significant increases in regurgitant fraction. Forces on the chordae tendineae increased as dilation increased prior to the identified threshold (p < 0.01); post-threshold, the MR resulted in highly variable forces. Ultimately, this novel dilation device can be used to more accurately model a wide range of MR disease states and their corresponding repair techniques using ex vivo experimentation. In particular, this annular dilation device provides the means to investigate the design and optimization of novel annuloplasty rings.
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8
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Li B, Cui Y, Zhang D, Luo X, Luo F, Li B, Tang Y. The characteristics of a porcine mitral regurgitation model. Exp Anim 2018; 67:463-477. [PMID: 29794373 PMCID: PMC6219876 DOI: 10.1538/expanim.18-0045] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The porcine mitral regurgitation (MR) model is a common cardiovascular animal model.
Standardized manufacturing processes can improve the uniformity and success rate of the
model, and systematic research can evaluate its potential use. In this study, 17 pigs were
divided into an experimental group (n=11) and a control group (n=6). We used a homemade
retractor to cut the mitral chordae via the left atrial appendage to establish a model of
MR; the control group underwent a sham surgery. The model animals were followed for 30
months after the surgery. Enlargement and fibrosis of the left atrium were significant in
the experimental group compared with those in the control group, and left atrial systolic
function decreased significantly. In addition, model animals showed preserved left
ventricular systolic function. There were no differences in left atrial potential or left
ventricular myocardial fibrosis between the two groups. Atrial fibrillation susceptibility
in the experimental group was higher than that in the control group. Our method enables
the simple and effective production of a MR model with severe reflux that can be used for
pathophysiological studies of MR, as well as for the development of preclinical surgical
instruments and their evaluation. This model could also be used to study atrial
fibrillation and myocardial fibrosis but is not suitable for studies of heart failure.
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Affiliation(s)
- Bo Li
- Animal Experimental Centre, Beijing Key Laboratory of Preclinical Research and Evaluation for Cardiovascular Implant Materials, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Centre for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, No.167 North lishi Road, Xicheng District, Beijing 100037, China
| | - Yongchun Cui
- Animal Experimental Centre, Beijing Key Laboratory of Preclinical Research and Evaluation for Cardiovascular Implant Materials, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Centre for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, No.167 North lishi Road, Xicheng District, Beijing 100037, China
| | - Dong Zhang
- Department of Cardiovascular surgery, Beijing Jishuitan Hospital, No. 31 Xinjiekou East Street, Xicheng District, Beijing 100035, China
| | - Xiaokang Luo
- Animal Experimental Centre, Beijing Key Laboratory of Preclinical Research and Evaluation for Cardiovascular Implant Materials, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Centre for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, No.167 North lishi Road, Xicheng District, Beijing 100037, China
| | - Fuliang Luo
- Animal Experimental Centre, Beijing Key Laboratory of Preclinical Research and Evaluation for Cardiovascular Implant Materials, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Centre for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, No.167 North lishi Road, Xicheng District, Beijing 100037, China
| | - Bin Li
- Animal Experimental Centre, Beijing Key Laboratory of Preclinical Research and Evaluation for Cardiovascular Implant Materials, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Centre for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, No.167 North lishi Road, Xicheng District, Beijing 100037, China
| | - Yue Tang
- Animal Experimental Centre, Beijing Key Laboratory of Preclinical Research and Evaluation for Cardiovascular Implant Materials, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Centre for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, No.167 North lishi Road, Xicheng District, Beijing 100037, China
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