Resumo

CURA, LEANDRO; MEJIA, KRUPSKAYA; DAYAN, VíCTOR  e  ESTABLE, HÉCTOR. Comportamiento in vitro de un anillo mitral ajustable para cirugía de reparación mitral. Rev.Urug.Cardiol. [online]. 2010, vol.25, n.3, pp.212-216. ISSN 1688-0420.

SUMMARY Background. Mitral ring downsizing is one of the techniques used in ischemic mitral regurgitation (MR) and MR due to dilated cardiopathy. In this technique, a prosthetic ring smaller than the native one is implanted in order to achieve mitral leaflet coaptation. Mitral ring prosthesis available up to date have fixed sizes and there is a risk that the chosen size turns out to be inadequate at follow-up. Some patients with severe ventricular dysfunction don’t tolerate mitral valve repair and the increase in afterload that accompanies it. In order to overcome these difficulties, we designed a new mitral ring adjustable through an extra-cardiac device and tested it in vitro. Methods. Mitral regurgitation was obtained in a porcine isolated heart after forced dilatation of the mitral annulus. The mitral ring prototype was sutured to the mitral annulus using the conventional technique. Using the extra-cardiac device, the mitral annulus could be reduced and dilated obtaining annular diameters from 24 to 32 mm. Results. Proportional modification of annulus dimensions maintaining the characteristic shape of the mitral ring and its proportions was achieved. Mitral regurgitation was corrected and the optimal annulus dimension was determined after various dilatation and reduction maneuvers. Conclusions. Through this isolated porcine heart model of MR, we demonstrated that our prototype can reduce and dilate the mitral annulus proportionately without changing the native mitral annulus shape through the use of an extra-cardiac device.

Palavras-chave : ISCHEMIC MITRAL REGURGITATION; MITRAL ANNULOPLASTY; MITRAL VALVE REPAIR; MYOCARDIAL ISCHEMIA.

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