Ejection phase indices of left ventricular performance in infants, children, and adults.

Abstract

A validatory study of quantitative single plane left ventricular cineangiography is presented, using human left ventricular casts ranging in sizefrom I.6 to 135 ml. Good correlation wasfound between actual and calculated volumes (r= o.967 (Fig. i) With the casts in a position approximating to the right anterior oblique projection 35-mm cine x-rays were taken. For calibration purposes a grid of centimetre squares was x-rayed at the position the cast occupied and these films were used to correct for x-ray magnification and distortion (Dodge, I97I).The cast volumes were calculated from these x-ray films using the area-length method of Dodge et al. (I960), assuming the left ventricle to be an ellipsoid of revolution. Regression analysis was performed comparing calculated volumes with true volumes using a logarithmic linearizing transformation. The graph thus derived (Fig. 2) was employed to correct the left ventricular volumes calculated from cineangiography in the clinical series.2) Patient studies A total of 62 patients was studied. The volume estimations were made from left ventricular angiocardiograms recorded during the course of clinically indicated cardiac catheterization. The right anterior oblique projection was chosen as it gave the maximum amount of clinical information about mitral valve movement, atrial and ventricular shunting, and mitral-aortic relations. The film speeds were either 44 or 64 frames/second. When the left heart was not entered, a pulmonary artery injection was performed. Left ventricular end-systolic and on 10 May 2018 by guest. Protected by copyright.

Echocardiographic study of right and left ventricular dimension and left ventricular function in patients with tetralogy of Fallot before and after surgery.

“…All the values calculated were found to be above 1-04 circ/s (the lower limit of normal) in the preoperative group (Cooper et al, 1972;Kaye et al, 1975;Tynan et al, 1975). Those patients who had diminished ejection fractions and diminished or borderline per cent shortening of internal diameter, were found 46 n 25 .…”