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A Preexcited Left Bundle Branch Block Tachycardia
Author(s) -
Morady Fred,
MORADY FRED
Publication year - 1997
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.1540-8167.1997.tb01835.x
Subject(s) - medicine , center (category theory) , left bundle branch block , heart failure , chemistry , crystallography
A 52-year-old woman underwent an electrophysiologic prtKedure because of a 30-year history of recurrent episodes of paroxysmal tachycardia. The baseline sinus cycle length wa.s 600 msec and the QRS complexes had a left bundle branch block configuration, with a QRS duration of 120 msec. The atrial-His (AH) and His-ventricular (HV) intervals were 90 and 20 msec, respectively. Programmed atrial stimulation with a sitigle extrastimulus demonstrated progressively greater degrees of ventricular preexcitation. with the HV interval shortening to -15 msec as the AV interval increased from 110 to 200 msec. Programmed atrial stimulation with two extrastimuH resulted in the induction of a tachycartha that had a cycle length of 310 msec and a left bundle branch block conflguratit^n (Fig. I), identical to the QRS complexes generated in response to