Document Detail

Verapamil for the suppression of idiopathic ventricular tachycardia of left bundle branch block-like morphology.
MedLine Citation:
PMID:  8237755     Owner:  NLM     Status:  MEDLINE    
This study examines the efficacy of verapamil for the suppression of idiopathic ventricular tachycardia (VT) of left bundle branch block LBBB-like morphology. Forty-two patients (mean age 36.2 +/- 12.1 years; 20 men and 22 women) with VT and without any underlying cardiac abnormality on clinical examination and noninvasive investigation were studied. The inducibility of clinical VT was examined by treadmill exercise testing and programmed ventricular stimulation (PVS). In 29 patients VT was inducible by exercise testing, in 24 by PVS, and in 23 there was evidence of VT on Holter monitoring. After baseline testing, patients were treated with verapamil 120 mg thrice daily for at least 5 half-lives for the drug to load before evaluation. With Holter monitoring, 74% of patients with evidence of VT at baseline testing demonstrated a change of status from nonsustained VT to no VT or from sustained VT to nonsustained VT. Four patients had nonsustained VT during verapamil treatment but no VT at baseline. There was a significant reduction in the number of ventricular ectopic beats over 24 hours (baseline: 15,541 +/- 17,599 vs verapamil treatment: 8892 +/- 15,582, p < 0.01). Exercise-induced VT was suppressed in 56% of patients with VT during baseline testing, but no effect of verapamil on the tachycardia was observed in 26%. The remaining patients demonstrated a partial response to verapamil; the rate of VT was unchanged, although the duration of the runs was reduced. Sustained monomorphic VT was inducible in only 5 patients, of whom 4 were rendered noninducible; 1 patient remained inducible.(ABSTRACT TRUNCATED AT 250 WORDS)
J S Gill; K Blaszyk; D E Ward; A J Camm
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  American heart journal     Volume:  126     ISSN:  0002-8703     ISO Abbreviation:  Am. Heart J.     Publication Date:  1993 Nov 
Date Detail:
Created Date:  1993-11-29     Completed Date:  1993-11-29     Revised Date:  2006-02-27    
Medline Journal Info:
Nlm Unique ID:  0370465     Medline TA:  Am Heart J     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1126-33     Citation Subset:  AIM; IM    
Department of Cardiological Sciences, St. George's Hospital Medical School, London, UK.
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MeSH Terms
Bundle-Branch Block / complications*
Cardiac Pacing, Artificial
Electrocardiography, Ambulatory / drug effects
Exercise Tolerance / drug effects
Middle Aged
Prospective Studies
Tachycardia, Ventricular / drug therapy*,  etiology,  physiopathology
Treatment Outcome
Verapamil / pharmacology,  therapeutic use*
Reg. No./Substance:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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