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1 Cardiac Unit and Department of Medicine, Beth Israel Hospital and Harvard Medical School, Boston
This report documents two instances of spontaneous alternate patterns of premature ventricular excitation during atrial bigeminy (alternating premature ventricular excitation). Previous reports of "alternating premature ventricular excitation" have required control of electrophysiologic parameters by atrial pacing methods. Illustration of this arrhythmia and a discussion of its mechanism constitute the substance of this report.
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