During the period of 1985 - 1991, 28 patients with corrected transposition of the great arteries and associated cardiac anomalies have been presented. Atrioventricular valve insuficiencies, conduction disturbances, surgical procedures and results were recorded. Their ages ranged between 2 months to 2 years. All patients were studied by two-dimensional echocardiography. Cardiac catheterization and angiography were performed on 23 of them. Seven patients (25%) had Ebstein's anomaly, one had straddiling of left sided atrioventricular valve and 13 had ventricular septal defect. Left atrioventricular valve regurgitation was identified in 12 patients (43%) and mild right atrioventriular valve regurgitation was diagnosed in 3. Pulmonary hypertension was present in 9 patients. There was complete atrioventricular block in four patients at their first admission. 11 patients underwent surgical corerction and one died ten days after the operation. One patient developed left-sided atrioventricular valve regurgitation postoperatively. Surgically induced complete heart block was seen in 5 patients who had undergone ventricular septal defect repair. Consequently, we stress that in the follow-up of patients with corrected transposition of the great arteries, right atrioventricular valve regurgitation as well as left sided atrioventricular valve regurgitation should be considered as a possibility.