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Morphine-induced seizures in newborn infants
Veterinary and Human Toxicology
|December 1, 1985
Summary
High-dose intravenous morphine sulfate can cause generalized seizures in neonates. Post-operative morphine administration should not exceed 20 micrograms/kg/hr to prevent adverse events.
Area of Science:
- Neonatal pharmacology
- Pediatric neurology
- Clinical toxicology
Background:
- Post-operative pain management in neonates often involves analgesics like morphine sulfate.
- Intravenous administration allows for precise titration of medication.
- Neonates may have altered drug metabolism and pharmacokinetics compared to older populations.
Observation:
- Two neonates receiving high-dose intravenous morphine sulfate (32 and 40 µg/kg/hr) for post-operative pain experienced generalized seizures.
- Concurrent administration of lower morphine doses (6-24 µg/kg/hr) in ten other neonates did not result in seizures.
- Elevated plasma morphine concentrations (60 and 90 mg/ml) were noted in the affected neonates.
Findings:
- Seizures in neonates were directly correlated with excessive plasma concentrations of morphine sulfate.
- Alternative causes for seizures were systematically excluded.
- Cessation of morphine administration led to the resolution of seizures, with no recurrence over an 8-month follow-up period.
Implications:
- The recommended maximum dose for post-operative intravenous morphine sulfate in neonates should be limited to 20 µg/kg/hr.
- This finding necessitates careful dose monitoring and adjustment of morphine sulfate in neonatal intensive care units.
- Further research into neonatal morphine pharmacodynamics and safe dosing strategies is warranted.