


* Departments of Neonatology
Pediatrics, KK Womens and Childrens Hospital, Singapore, Singapore
Clinical Trials and Epidemiology Research Unit, Singapore, Singapore
Objective. Indomethacin is used for closing the patent ductus arteriosus in premature infants. Prolonged low-dose indomethacin given over 6 days could potentially improve closure rates because ductal constriction is maintained long enough for more effective anatomic closure. We compared the efficacy of this regimen to conventional dosing in a cohort of very low birth weight infants.
Methods. In a 2-arm clinical trial, 140 infants were randomized to either conventional dose (0.2 mg/kg/dose every 12 hours for 3 doses) or prolonged low-dose indomethacin (0.1 mg/kg/dose daily for 6 doses). The primary outcome measure was ductal closure rate, and the secondary outcomes were the need for a second course of treatment, surgical ligation rates, and side effects.
Results. Ductal closure after 1 course of indomethacin was similar between the 2 groups: 68% for the conventional dose group and 72% for the prolonged low dose (mean difference 4%; 95% confidence interval: 19% to 11%). The incidence of transient oliguria was higher in the conventional dose group, 31% versus 9%. There was a trend toward more necrotizing enterocolitis in the prolonged low-dose group, 7.0% versus 1.4%.
Conclusions. There was no difference in efficacy between the 2 dosing regimens. In view of this and with its higher incidence of necrotizing enterocolitis, we do not recommend using prolonged low-dose indomethacin for closing the patent ductus arteriosus in very low birth weight infants.
Key Words: patent ductus arteriosus prolonged indomethacin premature infants very low birth weight randomized trial
Abbreviations: PDA, patent ductus arteriosus VLBW, very low birth weight NEC, necrotizing enterocolitis
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