Right ventricular papillary muscle approximation as a novel technique of valve repair for functional tricuspid regurgitation in an ex vivo porcine model

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Presentation transcript:

Right ventricular papillary muscle approximation as a novel technique of valve repair for functional tricuspid regurgitation in an ex vivo porcine model Haruo Yamauchi, MD, PhD, Nikolay V. Vasilyev, MD, Gerald R. Marx, MD, Hugo Loyola, MS, Muralidhar Padala, PhD, Ajit P. Yoganathan, PhD, Pedro J. del Nido, MD The Journal of Thoracic and Cardiovascular Surgery Volume 144, Issue 1, Pages 235-242 (July 2012) DOI: 10.1016/j.jtcvs.2012.01.028 Copyright © 2012 The American Association for Thoracic Surgery Terms and Conditions

Figure 1 Experimental procedure and echocardiographic analysis. A, Experimental setups of saline solution–filled tank and column. Height of the saline solution–filled column above the tank (a) was variable to pressurize the right ventricle (RV) from 20 to 60 mm Hg. The tricuspid regurgitation flow (in milliliters per minute) was calculated by measuring the reduced height (b) in the column for 5 to 60 seconds after the right ventricle was pressurized and tricuspid valve was closed. B, Schematic drawing of right ventricle–papillary muscle (PM) approximation. The anterior papillary muscle arises from the right ventricular wall. Medial and posterior papillary muscles arise from the ventricular septum. The head of the anterior papillary muscle is approximated to the 4 points of the septum: the medial papillary muscle (A-M), the posterior papillary muscle (A-P), the midpoint between the medial papillary muscle and the posterior papillary muscle (A-S1), and the intersection of the septum and the perpendicular line on the anterior papillary muscle (A-S2). C, A representative photograph of the tricuspid valve and sutures on the anterior papillary muscle. D, The distance between the anterior papillary muscle and septum is reduced by papillary muscle approximation (PMA) in each direction. E and F, Three-dimensional echocardiography was used to measure tricuspid annular dimension (E) and right ventricular geometry (F). The right ventricular sphericity index was calculated as a ratio of the right ventricular short-axis line (d) to the right ventricular long-axis line (c). The Journal of Thoracic and Cardiovascular Surgery 2012 144, 235-242DOI: (10.1016/j.jtcvs.2012.01.028) Copyright © 2012 The American Association for Thoracic Surgery Terms and Conditions

Figure 2 Changes of tricuspid regurgitation (TR) flow by right ventricle (RV)–papillary muscle approximation (PMA) and tricuspid annuloplasty (TAP). A, Without (−) tricuspid annuloplasty, tricuspid regurgitation flow under 40 mm Hg of right ventricular pressure was reduced by right ventricle–papillary muscle approximation. Tricuspid regurgitation flow was also reduced by tricuspid annuloplasty. Even with (+) tricuspid annuloplasty, right ventricle–papillary muscle approximation further reduced tricuspid regurgitation flow. Asterisk indicates P < .05 versus no annuloplasty with 0% papillary muscle approximation by Dunnett t test. Dagger indicates P < .05 versus tricuspid annuloplasty with 0% papillary muscle approximation by Dunnett t test. B, Tricuspid regurgitation flow was not different among the directions of right ventricle–papillary muscle approximation (details of directions given in Figure 1) according to analysis of variance. NS, Not significant. C, Tricuspid regurgitation flow under 20 or 60 mm Hg of right ventricular pressure was less or more than that under 40 mm Hg, respectively, but the effects of right ventricle–papillary muscle approximation and tricuspid annuloplasty were similar regardless of the right ventricular pressure. Asterisk indicates P < .05 by least significant difference comparison test. The Journal of Thoracic and Cardiovascular Surgery 2012 144, 235-242DOI: (10.1016/j.jtcvs.2012.01.028) Copyright © 2012 The American Association for Thoracic Surgery Terms and Conditions

Figure 3 Changes in tricuspid annular dimension produced by right ventricle–papillary muscle approximation (PMA) and tricuspid annuloplasty (TAP). A, These are representative photographs of tricuspid valve under 40 mm Hg pressure without (−) tricuspid annuloplasty before (0%) and after (100%) papillary muscle approximation toward the 4 directions (details of directions given in Figure 1). Black dotted lines reflect the contour of the tricuspid annulus before papillary muscle approximation. Black circles indicate coapting portions of 3 leaflets. AL, Anterior leaflet; SL, septal leaflet; PL, posterior leaflet. B through G, According to the 3-dimensional echocardiographic analysis, the septolateral diameter (B) and the area (D) of the tricuspid annulus were reduced by 50% and 100% papillary muscle approximation toward the septum (A-S1) as well as by performance of (+) tricuspid annuloplasty, although the anteroposterior diameter of the tricuspid annulus (C) was not changed by either papillary muscle approximation or tricuspid annuloplasty (analysis of variance). Among the directions of papillary muscle approximation, the tricuspid annular diameter (E and F) and area (G) did not differ, except for the septolateral diameter with 50% papillary muscle approximation, which was less in the A-M and the A-S1 groups than in the A-S2 and the A-P groups (E). Asterisk indicates P < .05 by least significant difference comparison test. NS, Not significant. The Journal of Thoracic and Cardiovascular Surgery 2012 144, 235-242DOI: (10.1016/j.jtcvs.2012.01.028) Copyright © 2012 The American Association for Thoracic Surgery Terms and Conditions

Figure 4 Changes in right ventricular (RV) geometry (sphericity and volume) and tethering height by right ventricle–papillary muscle approximation (PMA) and tricuspid annuloplasty (TAP). A, The representative cross-sectional 2-dimensional echocardiographic images of the hearts in the groups without (−) annuloplasty (0%, 50%, and 100% papillary muscle approximation toward A-S1) and the group with (+) annuloplasty (0% papillary muscle approximation), reproduced by the multiplanar 3-dimensional quantification mode of the Qlab software (Philips Healthcare, Andover, Mass). Arrows indicate the head of anterior papillary muscles. TV, Tricuspid valve. B, According to the 3-dimensional echocardiographic analysis, right ventricular sphericity index (RVSI) was reduced by papillary muscle approximation toward the septum (A-S1, see Figure 1 for details of directions) regardless of annuloplasty. Right ventricular sphericity index was not significantly reduced by annuloplasty except in the 100% papillary muscle approximation group. NS, Not significant. Asterisk indicates P < .05 by least significant difference comparison test. C, Right ventricular volume was reduced by 100% papillary muscle approximation (A-S1). D, Tethering height of valve was reduced by papillary muscle approximation (A-S1) regardless of annuloplasty. Annuloplasty did not change tethering height. E and F, The A-M group showed the lowest right ventricular sphericity index and right ventricular volume among the papillary muscle approximation directions. G, There was no difference in the valve tethering height among the papillary muscle approximation directions according to analysis of variance. The Journal of Thoracic and Cardiovascular Surgery 2012 144, 235-242DOI: (10.1016/j.jtcvs.2012.01.028) Copyright © 2012 The American Association for Thoracic Surgery Terms and Conditions