Journal
PEDIATRIC RESEARCH
Volume 82, Issue 4, Pages 678-684Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/pr.2017.129
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Funding
- Netherlands Organisation for Health Research and Development ZonMw [80-83600-98-10190]
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BACKGROUND: Exposure to acetaminophen and its metabolites in very-preterm infants is partly unknown. We investigated the exposure to acetaminophen and its metabolites upon 10, 15, or 20mg/kg intravenous acetaminophen in preterm infants. METHODS: In a randomized trial, 59 preterm infants (24-32 weeks' gestational age, postnatal age o1 week) received 10, 15, or 20 mg/kg acetaminophen intravenously. Plasma concentrations of acetaminophen and its metabolites (glucuronide, sulfate, cysteine, mercapturate, and glutathione) were determined in 293 blood samples. Area under the plasma concentration-time curves (AUC(0-500) min) was related to dose and gestational age. RESULTS: Between 10 and 20 mg/kg dose, median AUCs of acetaminophen, glucuronide, sulfate, and cysteine increased significantly resulting in unchanged ratios of AUC of metabolite to acetaminophen. The AUC ratio of glucuronide to acetaminophen increased with gestational age, that of sulfate decreased, and the ratio of cysteine and mercapturate remained unchanged. CONCLUSION: We found a gestational-age-dependent increase in glucuronidation but no evidence for saturation of a specific pathway as there was a proportional increase in exposure of acetaminophen and all metabolites. Compared with adults, very low exposure to glucuronide but higher exposure to sulfate, cysteine, and mercapturate metabolites was found, of which the relevance is not yet known.
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