title: Reverse alternating Wenckebach periodicity.
abstract: An atrial pacing-induced reverse conduction pattern of the alternating Wenckebach periodicity was observed in 5 of 42 children (12%) during electrophysiologic study. This conduction pattern is a reverse of the usual alternating Wenckebach periodicity: During an underlying 2:1 atrioventricular conduction block there is progressive shortening of the conduction time of the conducted impulses with termination in a lower degree of block. This reverse alternating Wenckebach periodicity may be caused by a mechanism similar to that in other Wenckebach phenomena.
mesh_terms: D001283:Atrioventricular Node / Q000503:physiopathology; D002036:Bundle of His / Q000503:physiopathology; D002304:Cardiac Pacing, Artificial; D002648:Child; D002675:Child, Preschool; D004594:Electrophysiology; D005260:Female; D006327:Heart Block / Q000503:physiopathology*; D006801:Humans; D008297:Male; D010507:Periodicity