Resting gated blood pool scan was used to derive left ventricular functional changes in norrnals (N=13, mean age=43) and in patients with coronary artery disease (N=50, mean age=53). Peak filling rates, average filling rates, and ejection fractions were significantly depressed m coronary artery disease. (p < 0.0005, each other). And in coronary artery disease with normal ejection fraction (N = 21), peak filling rates and average filling rates were depressed also, and peak filling rates of coronary artery disease with normal ejection fraction were abnormal in 61.2% and average fillin rates were abnormal in 71.4/. It appears that (1) resting peak filling rates and average filling rates were sensitive and easily obtainable pararneters of the diastolic dysfunction assosiated with coronary artery disease, (2) a significant proportion of coronary artery disease patients without any evidence of abnormal systolic function have depressed resting peak filling rates and average filling rates of the left ventricle.