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Right and left ventricular volume characteristics in children with transposition of the great arteries after Mustard's procedure.

With use of biplane cine-angiocardiograms, the measurements of right and left ventricular volume were determined in 11 children with transposition of the great arteries following Mustard's procedure. Right ventricular end-diastolic volume (RVEDV) ranged from 124 to 264 percent of the normal right ventricular volume with an average of 188 +/- 40 (SDM) percent, and left ventricular end-diastolic volume (LVEDV) ranged from 57 to 181 (122 +/- 43) percent of the normal (p less than 0.01, vs. RVEDV). Right ventricular ejection fraction (RVEF) ranged from 0.26 to 0.66 (0.42 +/- 0.11), and left ventricular ejection fraction (LVEF) ranged from 0.51 to 0.79 (0.66 +/- 0.09) (p less than 0.001, vs RVEF). Left ventriculography showed a deviation of the interventricular septum toward the left ventricle in patients with simple transposition of the great arteries not associated with left ventricular hypertension. The left to right ventricular systolic pressure ratio ranged from 0.22 to 1.02 (0.48 +/- 0.28), and the left to right ventricular end-diastolic volume ratio ranged from 0.43 to 1.00 (0.63 +/- 0.18). There was a high correlation between the left to right ventricular systolic pressure ratio and the left to right ventricular end-diastolic volume ration (r = 0.94, p less than 0.001). The left to right ventricular systolic pressure ratio also correlated well with the right ventricular ejection fraction (r = 0.90, p less than 0.001). Deviation of the interventricular septum was considered to result in a diminished ejection fraction of the right ventricle, in patients with simple transposition of the great arteries not associated with left ventricular hypertension, after Mustard's procedure.