Speckle Tracking Echocardiography (STE). (A) Epicardial left ventricular short-axis view used for STE. During analysis, knots (square-like points) are evenly distributed along the middle of the region of interest and the region of interest is itself divided into six standardized segments. Tracking of these knots from frame to frame is used for estimation of radial and circumferential strain in each segment. The anterior and posterior wall was defined as the yellow and pink segment, respectively. (B) Epicardial left ventricular long-axis view used for STE. The same principle is used for estimation of longitudinal strain in each segment. The anterior and posterior wall was defined as the dark blue and cyan segment, respectively.