Document Detail

Biplane assessment of left ventricular function during atrial fibrillation at beats with equal subsequent cycles.
MedLine Citation:
PMID:  16352354     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Prior study has demonstrated that the biplane single-beat method could be used to assess left ventricular function during atrial fibrillation at a beat with equal subsequent cycles. The study was to test whether we could improve the method by measuring a few beats with equal subsequent cycles and cycle-length limits. METHODS: In 75 patients with atrial fibrillation, stroke volume and ejection fraction were determined from simultaneous biplane views of left ventricle for 20 beats using a matrix-array transducer and a biplane Simpson's rule. The influence of cycle lengths on the values of systolic parameters at beats with equal subsequent cycles was examined from the plot of normalized parameters (measured values/average values) against cycle lengths. The values of 1 to 3 beats with equal subsequent cycles and cycle-length limits were averaged and compared with the average values over 20 beats by Bland-Altman and mean percentage difference analysis. The variability of repeat measurements was evaluated in 10 patients. RESULTS: The systolic parameters measured at beats with cycle lengths shorter than 500 ms were usually far below the average values. Agreement and mean percentage difference analysis revealed improved accuracy when 2 or 3 beats with cycle-length limits (>500 ms) were used for assessment. As the variability of averaging 2 or 3 beats is no greater than that of repeat measurements, both methods are equally good. CONCLUSIONS: Accurate assessment of left ventricular systolic function in atrial fibrillation can be obtained by averaging 2 beats with equal subsequent cycles and cycle-length limits (>500 ms).
Chun-Li Wang; Wan-Jing Ho; Nazar Luqman; Lung-An Hsu; Chi-Tai Kuo
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-12-13
Journal Detail:
Title:  International journal of cardiology     Volume:  113     ISSN:  1874-1754     ISO Abbreviation:  Int. J. Cardiol.     Publication Date:  2006 Oct 
Date Detail:
Created Date:  2006-11-06     Completed Date:  2007-01-04     Revised Date:  2007-02-22    
Medline Journal Info:
Nlm Unique ID:  8200291     Medline TA:  Int J Cardiol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  54-60     Citation Subset:  IM    
The Department of Cardiology, Chang Gung Memorial Hospital, No. 199, Tunhwa N. Road, Taipei, Taiwan.
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MeSH Terms
Atrial Fibrillation / physiopathology*,  ultrasonography*
Echocardiography / methods*
Heart Rate*
Middle Aged
Reproducibility of Results
Stroke Volume
Ventricular Function, Left*

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

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