INDIVIDUALIZED REPAIR OF THE LEFT ATRIOVENTRICULAR VALVE IN SPECTRUM OF ATRIOVENTRICULAR SEPTAL DEFECT

: From September 1977 to October 1995, 287 patients with atrioventricular septal defect (AVSD) aged from 2 months of 21 years underwent total repair in Kardiocentrum in prague. In 97 patients complete, in 20 transitional and in 170 patients partial form of AVSD was present. The repair consisted of closure of the defect and individually modified reconstruction of two atrioventricular (AV) orifices. In cases with a common orifice a two-patch technique was used. Fixation of undivided anterior and posterior common leaflets to patches in an appropriate level was essential in combination with complete closure of the cleft. Incomplete closure of the cleft was performed if potentially stenotic morphology was present. Commissuroplasty with pladgeted mattress stitches was done in patients with dilated annulus and commissuroplasty with a single stitch was performed if the annulus was not dilated. The methods were similar in cases with two AV orifices. The AV valve repair was difficult in the presence of severe regurgitation in valves with potentially stenotic morphology. Of the 287 operated patients 26 (9.1%) died during the early postoperative period. Mortality was 19.6% in the complete form and 3.7% in the partial and transitional forms. The mortality depended on morphology of the left atrioventricular valve. Potentially stenotic valvar morphology represented an important risk factor for death and reoperation. It was necessary to reoperate on 18 (6.3%) patients for significant "mitral" valve regurgitation. Reconstruction of a competent left AV valve is the most important step of AVSD repair which must always be modified according to individual morphological and functional abnormalities.