Abstract
BackgroundMorphine is widely used for sedation in premature infants and may have long-term effects on neurodevelopmental outcome. AimsTo assess its effect on cerebral activity of extremely preterm infants. MethodsRetrospective study in infants less than 28 weeks of gestational age (GA), treated with morphine and monitored with amplitude integrated EEG (aEEG), that were assessed at baseline and 6 consecutive 2 h periods. At each period, the background activity score and presence of cycling were determined. ResultsA total of 140 infants were included. Background aEEG activity score worsened in 40% of the infants by 6 h after morphine initiation and cycling, initially present in 70% of the infants, could be detected in only 10% after 10 h. On multivariable analysis, adjusted for baseline aEEG score and GA, the background activity decreased by 0.85 (95% confidence interval (CI): 0.74–0.97) immediately after morphine initiation, 0.72 (CI: 0.63–0.83) at 2 h later and on average by 0.64 (CI: 0.57–0.71) at each subsequent 2 h periods. The relative risk of cycling loss at 2 h and 4 h after morphine administration was 1.58 (CI: 1.15–2.16) and 3.37 (CI: 2.23–5.08), respectively. ConclusionsContinuous infusion of morphine in extremely preterm infants significantly depresses their cerebral activity soon after its commencement.
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