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Alternate Ventriculo‐Atrial Wenckebach Conduction during Ventricular Tachycardia
Author(s) -
LÉVY SAMUEL,
METGE MARC,
COINTE ROLAND,
FAUGERE GÉRARD,
VALEIX BERNARD,
GATAUPELANCHON JACQUELINE,
GERARD RAYMOND
Publication year - 1985
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.1985.tb05861.x
Subject(s) - medicine , cardiology , tachycardia , ventricular tachycardia , electrocardiography , anesthesia , heart block
Although pacing‐induced ventriculo‐atrial (VA) Wenckebach conduction has been previously described, the occurrence of this phenomenon during ventricular tachycardia has received little attention. The latter is defined as 2:1 VA block in which the conducted beats show progressive lengthening of VA conduction until the sequence is terminated by two or three blocked ventricular beats. This phenomenon was observed in a 16‐year‐old boy who underwent electrophysiologic study for ventricular tachycardia as a late complication of surgical correction of tetralogy of Fallot. During pacing‐induced ventricular tachycardia with a morphology similar to that of the spontaneous tachycardia, 8:4 alternating VA block was observed. This sequence suggested that the AV node was the site of block, the 2:1 block being located at the upper level, and the VA Wenckebach block at the lower level Alternate VA Wenckebach conduction appears as a possible cause of variation in atrial depolarization intervals during ventricular tachycardias with short cycle lengths.