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BackgroundThere is no injectable ibuprofen product marketed to treat patent ductus arteriosus (PDA) in newborns in Canada. The authors' institution has used ibuprofen arginine in the past. In the absence of published evidence supporting use of this salt form of ibuprofen for neonatal PDA, a retrospective analysis was undertaken.ObjectiveTo compare the effectiveness and adverse effects of ibuprofen arginine, ibuprofen tromethamine, and indomethacin in the treatment of PDA.MethodsThis retrospective observational cohort study, for patients admitted between 2009 and 2015, included preterm infants with symptomatic PDA who received at least one dose of injectable indomethacin, ibuprofen tromethamine, or ibuprofen arginine. Three effectiveness end points were analyzed: closure after one course of treatment, repeat medical treatment, and surgical ligation. The secondary end points included acute kidney injury, necrotizing enterocolitis, chronic lung disease, and time to full enteral feeding.ResultsA total of 179 infants were included. There were no differences among groups in terms of closure after one course of treatment (37/54 [69%] with indomethacin, 42/70 [60%] with ibuprofen tromethamine, and 28/55 [51%] with ibuprofen arginine; p = 0.21) or surgical ligation (10/54 [19%] with indomethacin, 13/70 [19%] with ibuprofen tromethamine, and 12/55 [22%] with ibuprofen arginine; p = 0.88). However, there was a difference regarding use of a repeat course of treatment, ibuprofen arginine having the highest rate (8/54 [15%] with indomethacin, 18/70 [26%] with ibuprofen tromethamine, and 20/55 [36%] with ibuprofen arginine; p = 0.04). After adjustment for gestational age, the association between ibuprofen arginine and increased use of a repeat course of treatment remained significant. The groups did not differ with respect to adverse effects.ConclusionThese results highlight the potential for differences in effectiveness among various salt forms of injectable ibuprofen and indomethacin. Because of the small sample size and retrospective methodology, confirmation of the present results through a larger prospective study is needed.

Effectiveness of Injectable Ibuprofen Salts and Indomethacin to Treat Patent Ductus Arteriosus in Preterm Infants: Observational Cohort Study