[Risk factors in the surgical repair of tetralogy of Fallot: analysis of preoperative factors by stepwise regression].
Fifty-one patients undergoing total repair of tetralogy of Fallot between November 1977 and June 1985 were analyzed with respect to determinants of operative mortality and postoperative right to left ventricular peak systolic pressure ratio (RV/LV). The risk factors were age, sex (Sex), previous shunting operation (Shunt), extent of right ventricular outflow tract patch (Patch), various PA-indexes, maximal left atrial volume/BSA (LA/BSA), left ventricular end diastolic volume index (LVEDVI), LVEDVI/normal-LVEDVI, RV/LV, Hb, BSA and weight. Univariate analysis indicated that RV/LV and LA/BSA were associated with operative death. A model for operative mortality with three variables emerged from the multiple stepwise regression analysis: Patch, Shunt and Sex (R = 0.421, R2 = 0.177, F = 3.37). A model for predicted RV/LV with five variables: Weight, Shunt, BSA, Patch and Sex (R = 0.602, R2 = 0.363, F = 5.12). However, it was thought difficult to predict operative mortality and postoperative RV/LV by the preoperative variables. Intra- and postoperative factors might have larger influences on operative mortality and RV/LV than the preoperative ones.
D000704:Analysis of Variance; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008297:Male; D011336:Probability; D012044:Regression Analysis; D012306:Risk; D013771:Tetralogy of Fallot / Q000401:mortality / Q000601:surgery*