PMID: 1199931Nov 1, 1975Paper

Alternating Wenckebach periodicity: A common electrophysiologic response

The American Journal of Cardiology
F Amat y LeonK M Rosen

Abstract

Alternating Wenckebach periods are defined as episodes of 2:1 atrioventricular (A-V) block in which conducted P-R intervals progressively prolong, terminating in two or three blocked P waves. In this study, His bundle recordings were obtained in 13 patients with pacing-induced alternating Wenckebach periods. Three patterns were noted: Pattern 1 (one patient with a narrow QRS complex) was characterized by 2:1 block distal to the H deflection (block in the His bundle) and Wenckebach periods proximal to the H deflection, terminating with two blocked P waves. Pattern 2 (four patients) was characterized by alternating Wenckebach periods proximal to the His bundle, terminating with three blocked P waves. Pattern 3 (eight patients) was characterized by alternating Wenckebach periods proximal to the His bundle, terminating with two blocked P waves. Alternating Wenckebach periods are best explained by postulating two levels of block. When alternating Wenckebach periods are terminated by three blocked P waves (pattern 2), the condition may be explained by postulating 2:1 block (proximal level) and type I block (distal level). When alternating Wenckebach periods are terminated by two blocked P waves (patterns 1 and 3), the condition may b...Continue Reading

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Citations

Sep 25, 2007·Herzschrittmachertherapie & Elektrophysiologie·S Richter
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Nov 2, 2021·Circulation·Yao-Tsung ChuangChin-Feng Tsai
Nov 3, 2021·Journal of the American Veterinary Medical Association·Weihow Hsue, Lance C Visser

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