Document Detail

Reduced high-frequency QRS components in electrocardiogram leads facing an area of the heart with intraventricular conduction delay due to bundle branch block.
MedLine Citation:
PMID:  16919677     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The mechanisms underlying high-frequency QRS components (HF-QRS) are incompletely understood. One theory is that HF-QRS are related to the conduction velocity of the heart. The purpose was to test this hypothesis by comparing HF-QRS in patients with left or right bundle branch block (LBBB and RBBB, respectively) to those in healthy subjects and in patients with ischemic heart disease (IHD). METHODS: Twenty-two patients with LBBB, 19 patients with RBBB, 63 normal subjects, and 64 patients with IHD were included. Twelve-lead electrocardiograms were analyzed in the frequency interval 150 to 250 Hz. RESULTS: The study showed reduced HF-QRS in patients with LBBB compared with healthy subjects and patients with IHD. The difference, however, was small in lead V(1) and V(2). In patients with RBBB, no differences in HF-QRS could be detected except in few leads; among those is lead V(1). CONCLUSION: The results support the theory that HF-QRS are related to the conduction velocity of the heart.
Elin Trägårdh; Jonas Pettersson; Galen S Wagner; Olle Pahlm
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-08-21
Journal Detail:
Title:  Journal of electrocardiology     Volume:  40     ISSN:  1532-8430     ISO Abbreviation:  J Electrocardiol     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-03-12     Completed Date:  2007-04-03     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0153605     Medline TA:  J Electrocardiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  127-32     Citation Subset:  IM    
Department of Clinical Physiology, Lund University, Lund, Sweden.
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MeSH Terms
Aged, 80 and over
Bundle-Branch Block / complications,  diagnosis*
Electrocardiography / methods*
Middle Aged
Reproducibility of Results
Sensitivity and Specificity
Ventricular Dysfunction, Left / complications,  diagnosis*

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