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Validation of Echocardiographic Left Atrial Parameters in Atrial Fibrillation Using the Index Beat of Preceding Cardiac Cycles of Equal Duration.
MedLine Citation:
PMID:  21865011     Owner:  NLM     Status:  Publisher    
BACKGROUND: The clinical assessment of left atrial function during atrial fibrillation is challenging and often inaccurate because of the beat-to-beat variability in the cycle length. The aim of this study was to validate the use of an index beat, the beat following two preceding cardiac cycles of equal duration, for the measurement of left atrial functional indices, including area, volume, and expansion index. The index beat was compared with the conventional but time-consuming method of averaging multiple consecutive cardiac cycles. METHODS: Thirty patients with persistent or permanent atrial fibrillation were studied using two-dimensional echocardiography, and left atrial indices were measured from the average of 17 consecutive cardiac cycles compared with that of an index beat taken from outside of these 17 cycles. RESULTS: The index beat showed good correlation with the averaging technique, and comparison of the two methods showed them to be interchangeable. Clinically, the differences in left atrial functional indices between the two methods were minor. CONCLUSIONS: Use of the index beat to measure dynamic left atrial function in atrial fibrillation can easily be performed and is as accurate as and less time consuming than the onerous method of averaging of multiple cardiac cycles.
Malini Govindan; Anatoli Kiotsekoglou; Samir K Saha; Gabor Borgulya; Abhay Bajpai; Bart H Bijnens; Giuseppe Sagnella; John A Camm
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-8-22
Journal Detail:
Title:  Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography     Volume:  -     ISSN:  1097-6795     ISO Abbreviation:  -     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-8-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8801388     Medline TA:  J Am Soc Echocardiogr     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 American Society of Echocardiography. Published by Mosby, Inc. All rights reserved.
Division of Cardiac and Vascular Sciences, St. Georges University of London, London, United Kingdom.
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