Effects of Cinching Force on the Tricuspid Annulus: A Species Comparison
- *Corresponding Author:
- Shamik Bhattacharya
Department of Engineering, St. Mary’s University, 1 Camino
Santa Maria, San Antonio, TX 78228, USA
E-mail: [email protected]
Received date: May 31, 2017; Accepted date: June 13, 2017; Published date: June 16, 2017
Citation: Aleman J, Adkins A, Boies L, Al-Quiati F, Sako E, et al. (2017) Effects of Cinching Force on the Tricuspid Annulus: A Species Comparison. J Cardiovasc Dis Diagn 5:283. doi: 10.4172/2329-9517.1000283
Copyright: © 2017 Aleman J, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Purpose: Tricuspid annuloplasty rings are commonly used to cinch an enlarged tricuspid annulus back to its original shape and size in patients with severe functional tricuspid regurgitation. However, the invasive operation is contraindicated for patients at risk for reoperation. Fortunately, transcatheter repair procedures, currently in the development process, are minimally invasive alternatives to current repair techniques. This study aims to determine the species-dependence of cinching force with the potential of informing transcatheter repair design by quantifying the minimum required cinching force necessary to reduce tricuspid regurgitation.
Methods: The cinching force necessary to reduce the septal-lateral diameter of a dilated annuls was quantified and compared in ten ovine hearts and nine porcine hearts. Additionally, a deparaffinization protocol and Verhoeff- Van Gieson stain were used to compare the microscopic structure of tissue samples at different stages of the experimental procedure in the two species.
Results: The maximum annulus dilation observed for the porcine was 11.2%, and the maximum cinching force was 0.40 ± 0.12 N. As previously demonstrated, ovine hearts yielded a maximum annulus dilation and cinching force of 8.82% and 0.38 ± 0.09 N respectively. Histological stains revealed no gross tissue differences between ovine and porcine septal or free wall tissues.
Conclusion: The cinching force was not species dependent between ovine and porcine models. This study is an essential first step for determining which animal model should be utilized for the development of transcatheter devices.