Document Detail


Prevalence and prognostic significance of exercise-induced right bundle branch block.
MedLine Citation:
PMID:  20185016     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Exercise-induced (EI) right bundle branch block (RBBB) is an infrequent electrocardiographic phenomenon, and controversy exists regarding its association with cardiovascular disease. We compared the prevalence and prognostic significance of RBBB, abnormal ST depression, and normal electrocardiographic findings in response to exercise testing in 9,623 consecutive veterans who underwent exercise testing from 1987 to 2007. EI RBBB, EI ST depression, and a normal exercise electrocardiographic response occurred in 0.24%, 15.2%, and 71.9% veterans, respectively. After appropriate exclusions, of the 8,047 patients analyzed, 6 patients in the EI RBBB subgroup died. Of these 6 deaths, 3 were cardiovascular deaths during the 9 years of follow-up. The annual death rate was 7.3% (1.4% cardiac deaths), 2.6% (1.2% cardiac deaths), and 1.8% (0.6% cardiac death) among those with EI RBBB, EI ST depression, and a normal ST response, respectively (p <0.0001). The patients with EI RBBB were significantly older, more overweight, and had a greater prevalence of coronary artery disease, heart failure, and hypertension compared to the 2 other subgroups. Patients with EI RBBB had an age-adjusted Cox proportional hazard ratio of 1.13 (p = 0.75, 95% confidence interval 0.51 to 2.5) for all-cause mortality and 1.57 (p = 0.43, 95% confidence interval 0.51 to 4.8) for cardiovascular mortality, respectively. In conclusion, EI RBBB is a rare occurrence during routine clinical exercise testing that appears to be benign.
Authors:
Ricardo Stein; Patricia Nguyen; Joshua Abella; Harold Olson; Jonathan Myers; Victor Froelicher
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of cardiology     Volume:  105     ISSN:  1879-1913     ISO Abbreviation:  Am. J. Cardiol.     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-02-26     Completed Date:  2010-04-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0207277     Medline TA:  Am J Cardiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  677-80     Citation Subset:  AIM; IM    
Copyright Information:
Published by Elsevier Inc.
Affiliation:
Exercise Pathophysiology Research Laboratory, Cardiology Division, Hospital de Clinicas de Porto Alegre, Porto Alegre, Brazil.
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MeSH Terms
Descriptor/Qualifier:
Aged
Bundle-Branch Block / diagnosis*,  epidemiology*,  physiopathology
Case-Control Studies
Cohort Studies
Electrocardiography
Exercise*
Exercise Test
Female
Humans
Male
Middle Aged
Prevalence
Prognosis
Risk Factors
Survival Analysis

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


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