Measurement of LV-LWFS from the A4C view. MAPSE was calculated from an average of lateral and medial measurements. Lateral and medial ventricular length were measured directly from the 2D image and averaged. MAPSElat and MAPSEmed=  = lateral and medial mitral annular plane systolic excursion, respectively, VLlat and VLmed = lateral and medial left ventricular length, respectively