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Termination of Ventricular Tachycardia by Nonpropagated Local Depolarization: Further Observations on Entrainment of Ventricular Tachycardia from an Area of Slow Conduction
Author(s) -
RUFFY RODOLPHE
Publication year - 1990
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.1540-8159.1990.tb02121.x
Subject(s) - medicine , cardiology , ventricular tachycardia , reentry , tachycardia , left ventricular aneurysm , qrs complex , ventricle , orthodromic , anesthesia , myocardial infarction , electrophysiology
A 60‐year‐old woman with a large left ventricular apical aneurysm underwent preoperafive catheter mapping of ventricular tachycardia. A zone of slow conduction with marked decremenlal conductive properties was identified between the left ventricular aneurysmal pouch and the right ventricular septum. Pacing from the right ventricuJar septum produced a QRS on the surface electrocardiogram of the same morphology as that of spontaneous ventricular tachycardia, while pacing from the left ventricular aneurysm caused tachycardia entrainment without fusion. Termination of ventricular tachycardia invariably occurred in association with an unpropagated left ventricular capture, followed by a change in ventricular activation to an opposite direction. This case provides a direct demonstration of reentrant ventricular tachycardia termination by orthodromic block in a zone of slow conduction.