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Estimation of Left Ventricular Ejection Fraction by Semiautomated Edge Detection
Author(s) -
VANDENBERG BYRON F.,
CARDONA HIRAM,
MILLER JAMES G.,
BURNS TRUDY L.,
SKORTON DAVID J.,
PÉREZ JULIO E.
Publication year - 1998
Publication title -
echocardiography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 62
eISSN - 1540-8175
pISSN - 0742-2822
DOI - 10.1111/j.1540-8175.1998.tb00671.x
Subject(s) - ejection fraction , parasternal line , tracing , diastole , cardiology , medicine , computer science , heart failure , blood pressure , operating system
Left ventricular (LV) volume and ejection fraction estimation from two‐dimensional echocardiograms requires off‐line analysis and time‐consuming manual tracing. LV volumes may be estimated on‐line with a semiautomated edge detection echocardiographic system [also known as acoustic quantification (AQ)], but there are few data that compare volumes obtained from the AQ method with volumes derived from off‐line manual tracing of conventional two‐dimensional echocardiograms. Echocardiograms were performed in 48 patients at two medical centers. LV volumes were measured from the apical view with the method of discs and area‐length formulae and from the parasternal short‐axis view with the modified ellipsoid model. Based on the criterion of ± 75% endocardial visualization, 25 (52%) of the short‐axis views and 14 (29%) of the apical views were analyzed by a single investigator. End‐diastolic and end‐systolic LV volumes derived on line with the AQ system showed a very strong linear association with off‐line, manually traced volumes (r = 0.96–0.99). Correlations for ejection fraction also were strong (r = 0.90–0.96). End‐diastolic and end‐systolic LV volumes, measured from the apical views, were underestimated by the AQ method. However, because the error was in the same direction, ejection fractions measured with the AQ system and by manual tracing of conventional echocardiograms were similar. Estimation of ejection fraction using a semiautomated edge detection echocardiographic system is a promising method for noninvasive evaluation of systolic function in carefully selected patients.