[Surgical management of patent ductus arteriosus in low body weight infants].

Between January 1980 and December 1994, seventeen premature infants weighing less than 2500 g underwent surgical management for the isolated patent ductus arteriosus (PDA). Indometacine therapy for closure of PDA was not effective for all these patients. In terms of the body weight at birth, they were divided into two groups; Group I (G-I) consisted of ten patients with birth weight less than 1000 g and Group II (G-II) of seven patients weighing more than 1000 g. The age at operation was 22.1 +/- 15.4 days in the G-I and 14.3 +/- 11.4 days in the G-II. The ductus was ligated in all patients but one of the G-II, in whom it was divided. There were five (50%) hospital deaths in the G-I and none in the G-II. The causes of death in the G-I were related to necrotizing enterocolitis (NEC) in two and infant respiratory distress syndrome (IRDS), acute renal failure, and broncho-esophagial fistula in each. The age at operation tended to be older in nonsurvivors rather than in survivors in the G-I (28.0 +/- 16.8 days vs. 16.2 +/- 14.0 days, respectively, but the difference did not reach significance). Before surgery, all patients in the G-I required mechanical ventilator support and nine of them were associated with IRDS. In contrast, only two patients in the G-II needed mechanical ventilation preoperatively. The postoperative period of intubation was also significantly longer in the G-I than in the G-II (51.6 +/- 35.2 days vs. 2.2 +/- 1.5 days, respectively, p < 0.05). In conclusions, the surgery for PDA can be safely performed even in small premature babies weighing less than 1000 g. When medical therapy for PDA is not effective in the premature patients, the surgical management should be considered as early as possible before their conditions become worse due to such critical complications as NEC, IRDS, and renal failure.