Ultrasonodiagnosis of Subclinical Heart Failure by Increasing Afterload with Angiotensin II

In an attempt to diagnose latent heart failure, a transient increase of afterload to left ventricle was produced by angiotensin II, and the ventricular movement was assessed by echocardiography. Angiotensin II was administered in a dose of 0.075 micrograms/kg body weight. Blood pressure was elevated by 40.5 +/- 14.5 mmHg in 38 cases with latent heart failure and by 41.2 +/- 4.5 mmHg in 30 normal subjects. Yet, only in the former group, posterior wall excursion of left ventricle reduced from 11.4 +/- 2.4 mm to 7.3 +/- 2.3 mm and mean posterior wall velocity from 41.4 +/- 10.1mm/sec to 26.5 +/- 8.8 mm/sec. The rates of these reductions were inversely correlated to the rate of elevation of left ventricular endodiastolic pressure as determined in 5 cases by cardiac catheterization. There was no change in 30 subjects. The data indicate the usefulness of angiotensin-induced echocardiographic changes in detecting latent cadiac failure.