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  • Title: Frequency and characteristics of progressive aberrancy during supraventricular tachycardia.
    Author: Betts TR, Goldberger JJ, Kadish AH.
    Journal: Am J Cardiol; 2003 Sep 15; 92(6):736-9. PubMed ID: 12972123.
    Abstract:
    Progressive aberrancy (defined as beats with QRS duration and morphology between that of sinus rhythm and full aberrancy) occurred in 10 of 32 episodes of atrial pacing in 5 of 11 patients. The episodes resembled fusion beats but were due to bilateral bundle branch delay.
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