IMPACT OF THE PRESERVATION OF THE SUBVALVULAR APPARATUS OF THE ANTERIOR MITRAL LEAFLET ON THE LEFT VENTRICULAR FUNCTION AFTER MITRAL VALVE REPLACEMENT IN EARLY POST-OPERATIVE PERIOD - Mahmoud F. El-Safty , Hazem Gamal Bakr , Mohamed A. El Badawy , Mohamed Abd El-Hady and Yahia Mahmoud (2020)