Decreased early diastolic dV/dt in ischemic heart disease observed by ECG-gated radiocardiography.

(1) ECG-gated RCG were performed in 127 cases, among them 30 were normal controls, 35 were hypertensives, 16 were ischemic heart diseases, 8 were cardiomyopathies and the rest of 38 cases were of miscellaneous cardiac diseases. (2) ECG-gated RCG were performed consecutively after the preceding RCG. Parameters calculated from RCG and ECG-gated RCG were evaluated together in terms of the sensitivity to discriminate the ischemic heart diseases from the control subjects. Among the parameters evaluated, peak diastolic dV/dt was the most sensitive index to discriminate the ischemic heart group from the control group. PDdV/dt of 20 ml/100 msec/m2 was considered to be a borderline between two groups. (3) Principal component analysis of 12 variables in 127 cases demonstrated that the peak diastolic dV/dt was closely correlated with the cardiac pump function, but was also well related to the ischemic heart factor. (4) ECG-gated RCG following the preceding RCG is a sensitive method to discriminate the ischemic heart disease from the control group.