Document Detail

Significance of left axis deviation in patients with chronic left bundle branch block.
MedLine Citation:
PMID:  696636     Owner:  NLM     Status:  MEDLINE    
Forty-nine patients with chronic left bundle branch block and a normal frontal axis were compared with 53 patients with left bundle branch block and left axis deviation. The following clinical variables were more frequent (P less than 0.05) in patients with left axis deviation: greater age, exertional angina, congestive heart failure, cardiomegaly, cardiac functional class II to IV, coronary artery disease and presence of organic heart disease. Absence of organic heart disease (primary conduction disease) was seen only in patients with a normal axis. Patients with left axis deviation had longer (P less than 0.05) mean P-R, A-H and H-V intervals and atrial and atrioventricular (A-V) nodal effective refractory periods. All patients were prospectifely followed up for 30 to 2,271 days with a mean +/- standard error of the mean follo-up period of 538 +/- 72 for the group with a normal axis and 604 +/- 72 days for the group with left axis deviation (difference not significant). A-V block developed in three patients (6 percent) with left axis deviation and in none of those with a normal axis. The cumulative 4 year mortality rate for the entire group approached 75 percent. The patients with left axis deviation had greater cardiovascular mortality (P less than 0.05). In conclusion, among patients with left bundle branch block, those with left axis deviation have a greater incidence of myocardial dysfunction, more advanced conduction desease and greater cardiovascular mortality than those with a normal axis.
R C Dhingra; F Amat-Y-Leon; C Wyndham; S S Sridhar; D Wu; K M Rosen
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American journal of cardiology     Volume:  42     ISSN:  0002-9149     ISO Abbreviation:  Am. J. Cardiol.     Publication Date:  1978 Oct 
Date Detail:
Created Date:  1978-11-22     Completed Date:  1978-11-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0207277     Medline TA:  Am J Cardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  551-6     Citation Subset:  AIM; IM    
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MeSH Terms
Bundle-Branch Block / etiology,  mortality,  physiopathology*
Follow-Up Studies
Heart Block / etiology,  therapy
Heart Conduction System / physiopathology*
Pacemaker, Artificial

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

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