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Peak Rate of Left-Ventricular Ejection by a Gated Radionuclide Technique: Correlation with Contrast Angiography

Veterans Administration Medical Center, San Diego
University of California, San Diego School of Medicine, La Jolla, California

Correspondence: For reprints contact: V. Bhargava, PhD (111A), Veterans Administration Medical Center, 3350 La Jolla Village Dr., San Diego, CA 92161.

ABSTRACT

Gated radionuclide cardiac blood-pool imaging can produce reliable estimates of left-ventricular (LV) volume and ejection fraction. The ventricular volume curve can be used to develop normalized ejection rates, since count volumes and framing times are known. To test the accuracy of the peak ejection rate (maximum dv/dt), as derived by a standard computer algorithm, we studied 15 patients with coronary artery disease by both contrast ventriculography and radionuclide angiography. Max dv/dt by the radionuclide technique correlated well with the angiographic result: r = 0.92, p < 0.01. The mean intraobserver variation was ±0.3 end-diastolic volumes per sec (±12%) and the mean interobserver variation ±0.33 end-diastolic volumes per sec (±13%). We conclude that maximum dv/dt may be derived from gated blood images, with reasonable accuracy and modest variability.

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