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Figure 1 Sampling points were determined for the left ventricular (LV) free wall (A) by dividing it into three parts: endocardial layer (End), mid-myocardial layer (Mid), and epicardial layer (Epi). Recordings of strain rate (SR) (B), strain (C), and velocity (D) sampled from the End, Mid, and Epi layers. The open arrow indicates an early diastolic wave, and the solid arrow indicates a late diastolic wave. IC = isovolumic contraction; IR = isovolumic relaxation; IVS = interventricular septum.