Segmental ejection fraction in normal subjects.

Following a modification of the area method described by Gelberg et al., left ventricular regional wall motion was studied in 30 normal subject. The left ventricular cineangiograms were filmed in the right anterior oblique projection at 48 frames/s after injection of 76% sodium-meglumine diatrizoate. The end-diastolic and end-systolic frames were each divided into 8 regions using a grid formed by longitudinal axis, which was traced from the midpoint of the aortic valve to the apex, and three equally spaced perpendiculars to the long axis. Segmental ejection fraction was estimated by determining the percent decrease in each segment area in end-systole with respect to the end-diastolic area. The mean values +/- S. D. obtained for each segment were: anterobasal 58 +/- 14%; anterolateral-proximal 59 +/- 6%; anterolateral-distal 58 +/- 4%; apical-superior 59 +/- 8%; apical-inferior 58 +/- 7%; diaphragmatic-distal 58 +/- 9%; diaphragmatic-proximal 55 +/- 6%; and posterobasal 42 +/- 15%. The values obtained are useful for comparison when evaluating left ventricular performance in patients.