Improved regional left ventricular performance in mitral valve replacement with orthotopic refixation of the anterior mitral leaflet.

ABSTRACT

BACKGROUND AND AIMS OF THE STUDY To investigate the influence of different surgical techniques of chordal preservation in mitral valve replacement (MVR) on left ventricular size and function, we studied a series of 244 patients who underwent mitral valve replacement either with (n = 161) or without (n = 83) preservation of the subvalvular structures. RESULTS: Preoperatively there were no differences between the two patient groups. Three months postoperatively, echocardiography demonstrated that chordal preservation in MVR resulted in smaller left ventricular end-systolic diameter (LVESD) and end-diastolic diameter (LVEDD) preservation versus resection, LVESD 43.4 +/- 7.8 mm versus 48.8 +/- 9.2 mm (p < 0.05), LVEDD 57.3 +/- 7.8 mm versus 62.9 +/- 10.5 mm (p < 0.05) and a significantly decreased LV-L (long axis) (87.1 +/- 4.2 mm versus 97.5 +/- 5.7 mm; p < 0.05). There was no significant difference in cardiac dimensions between the three patient subgroups in whom chordal preservation was possible. In addition, left ventricular ejection fraction in the preservation groups was significantly improved compared with the resection group (54.2 +/- 11.2% versus 48.1 +/- 12.4%, p < 0.05); there were no differences between the preservation subgroups. Regional wall motion analysis revealed significantly improved segmental myocardial performance in all segments if both leaflets were preserved or the anterior mitral leaflet was reattached to the anterior mitral annulus.