Point by Point Examination of the equilibrium gated radionuclide left ventricular time activity curve; validation by biplane angiography.

Examination of the time course of left ventricular ejection has been found useful in several clinical applications. Equilibrium gated radionuclide angiography provides non-invasive means to obtain the ventricular ejection curve. To evaluate the accuracy of the equilibrium gated radionuclide left ventricular volume curve we compared equilibrium gated radionuclide date with biplane cine-angiography in 16 patients examining each set of data on a point by point basis. The cine-angiographic data consisted of 60 frame per second biplane cineangiograms and the radionuclide data consisted of 28 points spanning the cardiac cycle. All data was normalized for the patient's heart rate and stroke volume. The equilibrium gated radionuclide angiographic data accurately reproduced the contrast angiographic data at each point on the curve. This result justifies using the equilibrium gated radionuclide time activity curve to evaluate parameters such as early systolic ejection rates or rates of maximum ventricular ejection.