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Mode of stimulation versus response: validation of a protocol for induction of ventricular tachycardia.

Abstract：

:Electrophysiologic studies were prospectively performed in 91 consecutive patients referred for evaluation of sustained ventricular tachycardia or sudden cardiac death. Fifty-two patients had a history of sustained ventricular tachycardia and 39 patients had a history of sudden cardiac death. The identical stimulation protocol was used in all patients. The stepwise protocol involved atrial pacing, burst ventricular pacing, single, double, and triple extrastimuli during ventricular pacing. Stimulation was performed at the right ventricular apex at two and five times diastolic threshold. Using this protocol, ventricular tachycardia was inducible in 48 (92%) of the 52 patients with a history of sustained ventricular tachycardia and in 28 (72%) of 39 patients with a history of sudden cardiac death (p less than 0.02). The use of a third extrastimulus increased the yield of inducible ventricular tachycardia by 37% in patients with a history of sustained ventricular tachycardia and by 25% in patients with a history of sudden cardiac death. Stimulation at five times diastolic threshold and stimulation from the right ventricular outflow tract added a 15% increment in overall yield of inducible ventricular tachycardia in patients with a history of sustained ventricular tachycardia, and a 26% increment in yield in patients with a history of sudden cardiac death. Forty-four (92%) of the 48 inducible patients in the sustained ventricular tachycardia group had inducible monomorphic ventricular tachycardia as compared to 19 (68%) of 28 patients in the sudden cardiac death group (p less than 0.02).(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Am Heart J

journal_title

American heart journal

authors

Oseran DS,Gang ES,Hamer AW,Zaher CA,Rosenthal ME,Mandel WJ,Peter T

doi

10.1016/0002-8703(85)90088-2

subject

Has Abstract

pub_date

1985-09-01 00:00:00

pages

646-51

issue

3

eissn

0002-8703

issn

1097-6744

pii

0002-8703(85)90088-2

journal_volume

110

pub_type

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