LEFT-VENTRICULAR PEAK EJECTION RATE, FILLING RATE, AND EJECTION FRACTION - FRAME RATE REQUIREMENTS AT REST AND EXERCISE - CONCISE COMMUNICATION

  • 1 January 1979
    • journal article
    • research article
    • Vol. 20  (3) , 189-193
Abstract
The effect of framing rate on the measurement of left-ventricular (LV) ejection fraction (EF), peak ejection rate (PER) and peak filling rate (PFR) was evaluated at rest and during exercise in 11 normal subjects and 21 patients (coronary artery disease, aortic regurgitation) who underwent gated equilibrium blood-pool imaging. Left-ventricular time-activity curves were obtained in each subject at rest and during stress, at temporal resolutions of 10, 20, 30, 40 and 50 ms per frame. Ejection fraction, PER and PFR were determined for each frame duration. By observing changes in the measured values of these quantities with framing rate for the measurement of EF, 50 ms/frame at rest and 40 ms/frame at exercise is sufficient; PER requires 40 ms/frame at rest and 20 ms/frame during exercise and for the measurement of PFR least 40 ms/frame at rest and 20 ms/frame during exercise are needed. These results should hold for 1st-pass and gated equilibrium studies.