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A Regular, Wide‐QRS Complex Tachycardia: What is the Tachycardia Mechanism?
Author(s) -
Morady Fred,
MORADY FRED
Publication year - 1999
Publication title -
journal of cardiovascular electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.193
H-Index - 138
eISSN - 1540-8167
pISSN - 1045-3873
DOI - 10.1111/j.1540-8167.1999.tb00721.x
Subject(s) - medicine , tachycardia , center (category theory) , chemistry , crystallography
A 45-year-old woman underwent an electrophysiology procedure because of a 20-year history of recunent episodes of paroxysmal tachycardia. The baseline sinus cycle length, atrial-His. and His-ventricular intervals were 700, 60, and 45 msec, respectively, and the QRS duration was 80 msec. Ventricular pacing at a cycle length of 300 msec induced a tachycardia that had a cycle length of 320 msec and a QRS duration of 120 msec, with a right bundle branch block configuration (Fig. 1). The tachycardia was terminated by ventricular pacing at cycle lengths shorter than 290 msec. Atrial pacing at a cycle length of 320 msec was performed in the setting of sinus rhythm (Fig. 2). What is the mechanism of this tachycardia?