Factors influencing successful closure with indomethacin of the patent ductus arteriosus in premature infants.

The incidence of persistent patency of the ductus arteriosus (PDA) is inversely related to birth weight. A PDA contributes to pathological conditions in the neonate and timely closure in these low-L birth-L weight infants could potentially prevent these complications. Prostaglandin inhibition with indomethacin is one treatment strategy currently available. This retrospective descriptive study evaluated the parameters that influenced the effectiveness of indomethacin in closure of the PDA in 101 consecutive premature infants and the adverse effects of indomethacin in these infants. Independent variables found to increase the risk of unsuccessful closure with indomethacin significantly were caesarean section, lower haematocrit at delivery and severity of hyaline membrane disease. Non-L closure also resulted in prolonged ventilation. No significant adverse effects were recorded in the infants who received indomethacin but neonatal jaundice was more common in those infants who responded to indomethacin.