This retrospective cohort study included 77 mother-infant dyads that delivered term pregnancies at a single tertiary care institution. The primary objective was to investigate whether maternal dose of opioid maintenance therapy during pregnancy affects infant outcomes. All infants had prenatal exposure to opioid maintenance therapies. Maternal dose was converted into morphine milligram equivalents (MMEs) and stratified into high- (MME >1000 mg) and low-dose groups (MME ≤1000 mg). Associations between infant outcomes and MME dosage were examined using Wilcoxon rank-sum and Fisher's Exact tests. Days to symptom control were significantly higher in the high MME group (5 days vs 2.8 days, P = .016). Rates of developmental delay at 24 months were higher in the high MME group (21.2% vs 4.5%, P = .0335). Maternal MME did not predict need for NOWS treatment. Higher MME-exposed infants should have optimized nonpharmacologic interventions for consolation and be increasingly observed for signs of developmental delay.
Keywords: MME; NOWS; buprenorphine; delay; developmental; opioid.