Mitral Valve Replacement :  When mitral valve replacement for a calcified, stenotic valve is done, usually it is a classical procedure removing leaflets, their chordae and pats of papillary muscles. However, if both leaflets and subvalvar apparatus could be preserved or at least the posterior leaflet, the results will be better. This is because the ellipsoidal shape of the ventricle and the geometry will be maintained. These results in better LV function and the short and long-term results of MVR will be better.