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. 2005 Apr 1;5(2):86–95.

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Copyright: © 2005 Mazur et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Surface ECG leads I, II, III, and intracardiac recordings from the left bundle (LB), His bundle (HBE), and right atrium (RA) during sinus rhythm (A) and interfascicular reentrant tachycardia (B). Note characteristic features of interfascicular reentry: (1) the H-V interval during tachycardia (70 ms) is shorter than that in sinus rhythm (100 ms); and (2) the LB potential precedes the His bundle potential. See text for discussion. (From: Crijns HJ, Smeets JL, Rodriguez LM, et al. Cure of interfascicular reentrant ventricular tachycardia by ablation of the anterior fascicle of the left bundle branch. J Cardiovasc Electrophysiol 1995;6:486-492, with permission of Blackwell Futura Publishing, Inc.)