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Electrophysiologic Characteristics of Electrically Induced Nonsustained Ventricular Tachycardia in the Late Stage of Canine Myocardial Infarction


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Title: Electrophysiologic Characteristics of Electrically Induced Nonsustained Ventricular Tachycardia in the Late Stage of Canine Myocardial Infarction
Authors: Yano, Katsusuke / Mitsuoka, Takao / Hirata, Tetsuya / Hano, Osamu
Issue Date: 25-Dec-1991
Citation: Acta medica Nagasakiensia. 1991, 36(1-4), p.61-69
Abstract: To examine electrophysiologic characteristics of electrically induced nonsustained ventricular tachycardia (NSVT), open chest electrophysiologic study was performed on 21 dogs with 25-day-old anteroapical myocardial infarction. Six of the 21 dogs had reproducibly inducible NSVT and five had reproducibly inducible sustained ventricular tachycardia (SuVT) in response to programmed ventricular stimulation. Remaining 10 dogs had no reproducibly inducible ventricular tachycardia or ventricular fibrillation (VF) in response to programmed ventricular stimulation. Twelve NSVTs in the 6 dogs were characterized by beat-to-beat variations of cycle length and QRS morphology of surface lead and also by wide disparity of local activation of the left ventricle, whereas 10 SuVTs in the five dogs did not show these electrophysiologic characteristics except during the first three to four beats. Three of the 12 NSVTs transformed into VF. Cycle lengths of these three NSVTs showed progressive shortening before transformation into VF. None of the 10 SuVTs transformed into VF. Continuous disorganized electrical activity was recorded on endocardial electrograms of the left ventricle in four of the 12 NSVTs, but not in the 10 SuVTs. It is concluded that in the late stage of canine myocardial infarction nonsustained ventricular tachycardia is an unstable ventricular tachyarrhythmia with some differences in electrophysiologic manifestation from sustained ventricular tachycardia.
URI: http://hdl.handle.net/10069/15869
ISSN: 00016055
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:Volume 36, No. 1-4

Citable URI : http://hdl.handle.net/10069/15869

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