Fig. 1

The concept of Left Ventricular Strain (LV Strain) depicted on the left side and Left Atrial Strain (LA Strain) depicted on the right side represent the relative changes in chamber length over a specified time interval -L(t) (depicted by red full circle), in comparison to the chamber length in end-diastole, denoted as L(ED) (depicted by blue full circle). The L(ED) is often defined as the time at which the mitral valve closes or the automatic detection of peak QRS occurs. For LV Strain, the time ‘t’ corresponds to end-systole (ES), which is precisely defined as aortic valve closure (AVC). On the other hand, for LA strain, the reservoir phase corresponds to the zenith of the strain curve