Doppler Tissue Imaging: A Non-Invasive Technique for Estimation of Left Ventricular End Diastolic Pressure in Severe Mitral Regurgitation - Sattarzadeh Badkoubeh, Roya; Jenab, Yaser; Zoroufian, Arezou; Salarifar, Mojtaba (The Research in Heart Yield and Translational Medicine (RHYTHM))