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A Study of the 16-Segment Regional Wall Motion Scoring Index and Biplane Simpson's Rule for the Calculation of Left Ventricular Ejection Fraction: A Comparison with Cardiac Magnetic Resonance Imaging.
MedLine Citation:
PMID:  21718352     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Aims: Accurate calculation of left ventricular ejection fraction (LVEF) is important for diagnostic, prognostic and therapeutic reasons. Cardiac magnetic resonance (CMR) is the reference standard for LVEF calculation, followed by real time three-dimensional echocardiography (RT3DE). Limited availability of CMR and RT3DE leaves Simpson's rule as the two-dimensional echocardiography (2DE) standard by which LVEF is calculated. We investigated the accuracy of the 16-Segment Regional Wall Motion Score Index (RWMSI) as an alternative method for calculating LVEF by 2DE and compared this to Simpson's rule and CMR. Methods and Results: The 2D echocardiograms of 110 patients were studied (LVEF range: 7-74%); 57 of these underwent CMR. A RWMS was applied, based on the consensus opinion of two experienced cardiologists, to each of 16 American Heart Association myocardial segments (RWMSI: hyperkinesis = 3; normal regional contraction = 2; mild hypokinesis = 1.25; severe hypokinesis = 0.75; akinesis = 0; dyskinesis =-1). LVEF was calculated by: LVEF(%) =Σ(16segRWMS)/16×30. LVEF was calculated by Simpson's rule and CMR using standard methods. Results were correlated against CMR. Intertechnique agreement was examined. A P value of<0.05 was considered significant. RWMSI-LVEF correlated strongly with Biplane Simpson's rule (P< 0.001, r = 0.915). RWMSI-LVEF had a strong correlation to CMR (P < 0.001, r = 0.916); Simpson's rule-LVEF had a moderate correlation to CMR (P< 0.001, r = 0.647). In patients with LV dysfunction (EF < 55%), on linear regression analysis, RWMSI-LVEF had a better correlation with CMR than Simpson's rule. Further more Simpson's rule overestimated LVEF compared to CMR (mean difference: -6.12 ± 16.44, P = 0.002) whereas RWMSI did not (mean difference: 2.58 ± 14.80, P = NS). Conclusion: RWMSI-LVEF correlates strongly with CMR with good intertechnique agreement. In centers where CMR and RT3DE are not readily available, the use by experienced individuals, of the RWMSI for calculating LVEF may be a more simple, accurate, and reliable alternative to Simpson's rule. (Echocardiography 2011;**:1-8).
Authors:
Rae F Duncan; Ben K Dundon; Adam J Nelson; James Pemberton; Kerry Williams; Matthew I Worthley; Azfar Zaman; Honey Thomas; Stephen G Worthley
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-7-1
Journal Detail:
Title:  Echocardiography (Mount Kisco, N.Y.)     Volume:  -     ISSN:  1540-8175     ISO Abbreviation:  -     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-7-1     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8511187     Medline TA:  Echocardiography     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2011, Wiley Periodicals, Inc.
Affiliation:
Cardiovascular Research Centre, Royal Adelaide Hospital and University of Adelaide, Adelaide, South Australia, Australia Cardiology, The Freeman Hospital and Institute of Cellular Medicine, Newcastle University, Newcastle-upon-Tyne, UK.
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