Document Detail

A prospective comparison of programmed ventricular stimulation with triple extrastimuli versus single and double extrastimuli during infusion of isoproterenol.
MedLine Citation:
PMID:  2644794     Owner:  NLM     Status:  MEDLINE    
This prospective study compared the yield of programmed ventricular stimulation with single and double extrastimuli during an infusion of isoproterenol with that of programmed stimulation with triple extrastimuli. The subjects of this study were 58 patients who underwent programmed stimulation and did not have inducible ventricular tachycardia (VT) with single or double extrastimuli at two basic drive cycle lengths and at two right ventricular sites; 17 patients had a history of uniform VT unrelated to exercise, and 41 had no history of documented or suspected VT or ventricular fibrillation (VF). Programmed stimulation was performed with triple extrastimuli at both right ventricular sites. Isoproterenol was infused as a dose titrated to increase the sinus rate by 25% or to a rate of 100 beats/min, whichever was greater, and stimulation then was repeated with single and double extrastimuli. Among the 17 patients with a history of uniform VT, the clinical VT was induced by three extrastimuli in five patients (29%) and by two extrastimuli during isoproterenol infusion in six patients (35%, p greater than 0.05). Among the total study population of 58 patients, nonclinical multiform VT or VF was induced by three extrastimuli in 29 patients (50%), and by two extrastimuli during isoproterenol infusion in 15 patients (26%, p less than 0.05). Therefore stimulation with two extrastimuli during isoproterenol infusion has the same probability of inducing a clinical form of VT as does stimulation with extrastimuli, but the former has a significantly lower probability of inducing nonclinical multiform VT and VF.
J M Baerman; F Morady; M de Buitleir; L A DiCarlo; W H Kou; S D Nelson
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  American heart journal     Volume:  117     ISSN:  0002-8703     ISO Abbreviation:  Am. Heart J.     Publication Date:  1989 Feb 
Date Detail:
Created Date:  1989-03-17     Completed Date:  1989-03-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370465     Medline TA:  Am Heart J     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  342-7     Citation Subset:  AIM; IM    
Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor.
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MeSH Terms
Cardiac Pacing, Artificial / methods*
Heart / physiopathology*
Heart Ventricles
Isoproterenol / diagnostic use*
Middle Aged
Prospective Studies
Sensitivity and Specificity
Tachycardia, Supraventricular / etiology,  physiopathology
Ventricular Fibrillation / etiology,  physiopathology
Reg. No./Substance:

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