 A prospective observational study was conducted in an acutely dyspneic patients with receiving echocardiagraphy by the chief physicians. Measurements were performed before echocardiography lab by the physician who conducted the survey in the emergency department. In parasternal long axis view mitral valve E-Point Septal Separation EPSS M-Mod measurements and mitral valve anterior leaflet and septal distance P-ALSS B-Mod measurements and in apical four chamber view mitral valve anterior leaflet and septal distance A-ALSS B-Mod measurements and distance between mitral valve anterior and posterior leaflets MVLS B-Mod measurements were acquired as the minimum distance in diastole. LVEF of patients were measured by cardiologist. Correlation of the all values between LVEF and sensitivity, specificity, and likelihood probabilities were calculated. 