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Author Notes:

Ajit P. Yoganathan,313 Ferst Dr., Atlanta, GA 30332,Ph. (404)894-2849, Fax.(404) 894-4243, ajit.yoganathan@bme.gatech.edu.

Subjects:

Research Funding:

This study was supported by a research grant awarded from the National Institute of Health (R01 HL090661-02); and from the National Heart and Lung Institute (HL063954, HL073021, HL103723, and HL108330).

Robert Gorman and Joseph Gorman were supported by individual Established Investigator Awards from the American Heart Association.

Keywords:

  • Science & Technology
  • Life Sciences & Biomedicine
  • Cardiac & Cardiovascular Systems
  • Respiratory System
  • Surgery
  • Cardiovascular System & Cardiology
  • CHORDAL FORCE DISTRIBUTION
  • ANNULAR DILATATION
  • HEART-FAILURE
  • ANNULOPLASTY
  • REVASCULARIZATION
  • MECHANISMS
  • GEOMETRY
  • REPAIR

In Vitro Mitral Valve Simulator Mimics Systolic Valvular Function of Chronic Ischemic Mitral Regurgitation Ovine Model

Tools:

Journal Title:

Annals of Thoracic Surgery

Volume:

Volume 95, Number 3

Publisher:

, Pages 825-830

Type of Work:

Article | Post-print: After Peer Review

Abstract:

Background: This study was undertaken to evaluate an in vitro mitral valve (MV) simulator's ability to mimic the systolic leaflet coaptation, regurgitation, and leaflet mechanics of a healthy ovine model and an ovine model with chronic ischemic mitral regurgitation (IMR). Methods: Mitral valve size and geometry of both healthy ovine animals and those with chronic IMR were used to recreate systolic MV function in vitro. A2-P2 coaptation length, coaptation depth, tenting area, anterior leaflet strain, and MR were compared between the animal groups and valves simulated in the bench-top model. Results: For the control conditions, no differences were observed between the healthy animals and simulator in coaptation length (p = 0.681), coaptation depth (p = 0.559), tenting area (p = 0.199), and anterior leaflet strain in the radial (p = 0.230) and circumferential (p = 0.364) directions. For the chronic IMR conditions, no differences were observed between the models in coaptation length (p = 0.596), coaptation depth (p = 0.621), tenting area (p = 0.879), and anterior leaflet strain in the radial (p = 0.151) and circumferential (p = 0.586) directions. MR was similar between IMR models, with an asymmetrical jet originating from the tethered A3-P3 leaflets. Conclusions: This study is the first to demonstrate the effectiveness of an in vitro simulator to emulate the systolic valvular function and mechanics of a healthy ovine model and one with chronic IMR. The in vitro IMR model provides the capability to recreate intermediary and exacerbated levels of annular and subvalvular distortion for which IMR repairs can be simulated. This system provides a realistic and controllable test platform for the development and evaluation of current and future IMR repairs.

Copyright information:

© 2013 The Society of Thoracic Surgeons.

This is an Open Access work distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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