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Circulation, Vol 59, 1196-1206, Copyright © 1979 by American Heart Association

ARTICLES

Measurement of left ventricular ejection fraction by mechanical cross- sectional echocardiography

KW Carr, RL Engler, JR Forsythe, AD Johnson and B Gosink

Cross-sectional echocardiography is a new noninvasive technique for imaging the heart. We developed a method for using mechanical cross- sectional echocardiograms (sector scans) to determine left ventricular volumes and ejection fraction. Using left ventricular cineangiography as a standard, sector scan ejection fraction correlated better (r = 0.93) than M-mode echocardiography by any of three established methods, and the sector scan regression line did not differ from the line of identity (p greater than 0.33). Interobserver variability for sector scan ejection fraction was 2.3 +/- 1.2% (mean +/- SD). Variation between two studies performed within 24 hours and analyzed by the same observer was 1.4 +/- 1.5%. However, the sector scans consistently underestimated left ventricular end-diastolic volume. We conclude that sector scan echocardiography is more reliable than conventional M-mode technique for estimating left ventricular ejection fraction, but estimation of left ventricular end-diastolic volume is unreliable with the methods currently available.

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