Document Detail

Effects of acebutolol on paroxysmal atrioventricular reentrant tachycardia in patients with manifest or concealed accessory pathways.
MedLine Citation:
PMID:  6848337     Owner:  NLM     Status:  MEDLINE    
Electrophysiologic studies before and after administration of 50 mg of intravenous (IV) acebutolol were performed in 20 patients. Four of the 20 had persistent preexcitation, two had intermittent preexcitation, and 14 had a concealed retrogradely conducting accessory pathway (AP). Acebutolol depressed anterograde AP conduction with loss of preexcitation in one patient and increased the effective refractory period of AP in the remaining three; in most, it depressed anterograde normal pathway conduction. The longest atrial paced cycle length producing atrioventricular (AV) nodal block increased from 290 +/- 7 to 39 +/- 6 msec (mean +/- SEM) after acebutolol (p less than 0.01). Acebutolol had no significant effect on retrograde AP conduction. Sustained AV reentrant tachycardia was inducible in all 20 patients before acebutolol and in 19 after acebutolol. The cycle length of tachycardia increased from 323 +/- 8 to 352 +/- 8 msec after acebutolol (p less than 0.01), reflecting an increment of A-H interval from 148 +/- 8 to 174 +/- 9 msec (p less than 0.01). Electrophysiologic studies were reported after 800 mg of oral acebutolol given in four divided doses at six-hour intervals in eight patients. The results were comparable to those of IV acebutolol. Thus, acebutolol depresses AV nodal conduction and slows the rate of AV reentrant tachycardia, but is generally ineffective in inhibiting the induction of sustained tachycardia. It occasionally depresses anterograde AP conduction.
H C Kou; S J Yeh; F C Lin; J S Hung; D Wu
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Chest     Volume:  83     ISSN:  0012-3692     ISO Abbreviation:  Chest     Publication Date:  1983 Jan 
Date Detail:
Created Date:  1983-02-14     Completed Date:  1983-02-14     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0231335     Medline TA:  Chest     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  92-7     Citation Subset:  AIM; IM    
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MeSH Terms
Acebutolol / administration & dosage*
Administration, Oral
Heart Block / physiopathology
Heart Conduction System / drug effects*
Heart Function Tests
Infusions, Parenteral
Middle Aged
Tachycardia, Paroxysmal / physiopathology*,  prevention & control
Wolff-Parkinson-White Syndrome / physiopathology
Reg. No./Substance:

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

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