Document Detail


Effect of beta adrenergic receptor blockade on cardiac autonomic tone in patients with chronic stable angina.
MedLine Citation:
PMID:  8848388     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Decreased heart rate variability, which may be due to increased sympathetic and decreased parasympathetic activity, has been shown to be predictor of cardiac events after acute myocardial infarction. The present study was undertaken to analyze the effect of beta adrenergic blockade on cardiac autonomic system in patients with chronic stable angina. Nineteen patients (15 males and 4 females, age range 44-74 years) with chronic stable angina were enrolled. After stopping all cardiac medications, patients had two baseline treadmill tests with both reproducible angina and ST depression and a baseline 48-hour ambulatory ECG recording. A long-acting beta-blocker (atenolol or betaxolol) was started and titrated to the maximal tolerated dose. After 1-2 months, a repeat 48-hour ambulatory ECG recording on beta-blocker therapy was obtained. Heart rate variability analysis was performed on the baseline and drug therapy ECG recordings. The average heart rate significantly decreased (P < 0.008), and the mean RR interval significantly increased (P < 0.0001). In the time-domain analysis, the standard deviation, variance, ASDNN5, and SDANN5 were not significantly affected, although the PNN50 increased. In the frequency domain, the total power (P < 0.0001) and the low frequency (P < 0.001) components decreased, while the high frequency spectrum was unchanged. Thus, sympathetic activity significantly declined in patients with chronic stable angina on beta-blocker therapy, while parasympathetic tone demonstrated a heterogenous response.
Authors:
A J Burger; M Kamalesh; S Kumar; R Nesto
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Multicenter Study    
Journal Detail:
Title:  Pacing and clinical electrophysiology : PACE     Volume:  19     ISSN:  0147-8389     ISO Abbreviation:  Pacing Clin Electrophysiol     Publication Date:  1996 Apr 
Date Detail:
Created Date:  1996-10-24     Completed Date:  1996-10-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7803944     Medline TA:  Pacing Clin Electrophysiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  411-7     Citation Subset:  IM    
Affiliation:
Cardiovascular Division, Deaconess Hospital, Harvard Medical School, Boston, Massachusetts 02215, USA.
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MeSH Terms
Descriptor/Qualifier:
Adrenergic beta-Antagonists / therapeutic use*
Angina Pectoris / drug therapy*,  physiopathology*
Atenolol / therapeutic use*
Autonomic Nervous System / drug effects*,  physiopathology
Betaxolol / therapeutic use*
Electrocardiography, Ambulatory
Exercise Test
Female
Fourier Analysis
Heart / innervation*
Heart Rate / drug effects*,  physiology
Humans
Male
Middle Aged
Myocardial Infarction / physiopathology
Prospective Studies
Signal Processing, Computer-Assisted
Chemical
Reg. No./Substance:
0/Adrenergic beta-Antagonists; 29122-68-7/Atenolol; 63659-18-7/Betaxolol

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


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