Measurement of ventricular function by ECG gating during atrial fibrillation

S. L. Bacharach, M. V. Green, R. O. Bonow, S. L. Findley, H. G. Ostrow, G. S. Johnston

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


The assumptions necessary to perform ECG-gated cardiac studies are seemingly not valid for patients in atrial fibrillation (AF). To evaluate the effect of AF on equilibrium gated scintigraphy, beat-by-beat measurements of left-ventricular function were made on seven subjects in AF (mean heart rate 64 bpm), using a high-efficiency nonimaging detector. The parameters evaluated were ejection fraction (EF), time to end-systole (TES), peak rates of ejection and filling (PER,PFR), and their times of occurrence (TPER,TPFR). By averaging together single-beat values of EF, PER, etc., it was possible to determine the true mean values of these parameters. The single-beat mean values were compared with the corresponding parameters calculated from one ECG-gated time-activity curve (TAC) obtained by superimposing all the single-beat TACs irrespective of their length. For this population with slow heart rates, we find that the values for EF, etc., produced from ECG-gated time-activity curves, are very similar to those obtained from the single-beat data. Thus use of ECG gating at low heart rates may allow reliable estimation of average cardiac function even in subjects with AF.

Original languageEnglish (US)
Pages (from-to)226-231
Number of pages6
JournalJournal of Nuclear Medicine
Issue number3
StatePublished - Dec 1 1981

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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