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Morphine glucuronidation in premature neonates

R Hartley1, M Quinn, M Green

  • 1Department of Clinical Medicine, University of Leeds, Leeds General Infirmary, West Yorkshire.

British Journal of Clinical Pharmacology
|March 1, 1993
PubMed
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Morphine glucuronidation in premature neonates shows linear kinetics, with increasing metabolite levels (M3G and M6G) related to birth weight. Significant respiratory stimulant M3G concentrations are achieved rapidly.

Area of Science:

  • Pharmacology
  • Neonatal Medicine
  • Drug Metabolism

Background:

  • Neonates, particularly premature infants, exhibit immature metabolic pathways.
  • Morphine is commonly used for pain management in neonates, but its metabolism is not fully understood.
  • Understanding morphine glucuronidation is crucial for optimizing neonatal pain management and minimizing adverse effects.

Purpose of the Study:

  • To investigate the pharmacokinetics of morphine glucuronidation in premature neonates.
  • To determine if morphine glucuronidation capacity is saturated at standard infusion rates.
  • To explore the relationship between morphine metabolite concentrations and neonatal factors like birth weight.

Main Methods:

  • Plasma concentrations of morphine, morphine-3-glucuronide (M3G), and morphine-6-glucuronide (M6G) were measured in 10 premature neonates.

Related Experiment Videos

  • Samples were collected after 24 hours of morphine therapy, including a loading infusion and constant rate infusion.
  • Statistical analysis was used to correlate metabolite concentrations with morphine levels, infusion rates, and birth weight.

    • Main Results:

    • Plasma concentrations of M3G and M6G significantly correlated with morphine concentrations, indicating non-saturable glucuronidation at the studied rates.
    • M3G/morphine and M6G/morphine ratios were independent of morphine infusion rates and plasma concentrations, supporting linear kinetics.
    • These ratios increased significantly with increasing birth weight, suggesting a role for liver size in glucuronidation capacity.

    Conclusions:

    • Morphine glucuronidation in premature neonates exhibits linear kinetics and appears to increase with birth weight.
    • Despite overall deficiency, significant levels of the respiratory stimulant M3G are achieved rapidly.
    • The respiratory depressant M6G was not detected at 2 hours, suggesting a potential safety window for early morphine administration.