Fig. 1From: Clinical value of myocardial performance index in patients with isolated diastolic dysfunctionScheme for measurement of time intervals used to calculate the tissue Doppler-derived myocardial performance index (TDI-MPI): a, time from cessation of the a’ wave to the onset of the e’ wave; b, the duration of the S wave; c, interval between the R wave and onset of the e’ wave; d, interval between the R wave and cessation of the S wave; ICT, tissue Doppler-derived isovolumetric contraction time; IVRTBack to article page