Effects of pulse rate, systemic arterial pressure, peripheral resistance and left ventricular end-diastolic dimension on the parameters were also observed.

Normal value(mean±SD) of fractional shortening was 34.0±5.2%, ejection fraction 0.71±0.07, mean rate of circumferential fiber shortening 1.15±0.19 circ/sec, mean posterior wall velocity 4.05±0.70cm/sec, maximal posterior wall velocity 6.31±1.26cm/sec, mean normalized posterior wall velocity 0.82±0.14/sec, and maximal normalized posterior wall velocity 1.28±0.24/sec.

There were negative correlations of peripheral resistance to fractional shortening, ejection fraction and mean rate of circumferential fiber shortening. Pulse rate and left ventricular end-diastolic dimension did not have significant effects on these parameters.

Mean and maximal posterior wall velocity had negative correlations to peripheral resistance and positive correlations to left ventricular end-diastolic dimension. But mean and maximal normalized posterior wall velocity had no correlations to any of them.