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Continuous intravenous morphine infusion in postoperative newborn infants
E A Farrington1, G A McGuinness, G F Johnson
1Department of Pharmacy Practice, School of Pharmacy and Pharmacal Sciences, Purdue University, West Lafayette, Indiana.
American Journal of Perinatology
|January 1, 1993
Summary
Continuous morphine sulfate infusion effectively manages postoperative pain in neonates. This study found it safe and effective, reducing pain indicators like beta-endorphin levels without adverse effects.
Area of Science:
- Neonatal surgery
- Pediatric anesthesiology
- Pharmacology
Background:
- Neonatal postoperative pain management is critical.
- Morphine sulfate is a common analgesic, but its use in neonates requires careful evaluation.
- Understanding morphine pharmacokinetics and safety in neonates is essential.
Purpose of the Study:
- To evaluate the efficacy and safety of continuous intravenous morphine sulfate infusion in neonates undergoing surgery.
- To assess morphine pharmacokinetics, including serum concentrations, half-life, and elimination rate.
- To monitor physiological parameters and serum beta-endorphin levels as indicators of pain and response to morphine.
Main Methods:
- Twenty neonates received a morphine sulfate loading dose followed by a continuous infusion.
- Intravenous morphine administration at 50 mcg/kg loading dose and 15 mcg/kg/hr infusion.
- Continuous monitoring of heart rate, respiratory rate, and blood pressure.
- Analysis of serum morphine and beta-endorphin levels, and urinary morphine excretion.
Main Results:
- Mean morphine infusion duration was 34 hours with a steady-state serum concentration of 39 ng/ml.
- Pharmacokinetic parameters included a half-life of 6.6 hours and an elimination rate of 0.126 hr-1.
- Significant reduction in serum beta-endorphin levels was observed, indicating effective pain control.
- No adverse events attributed to morphine therapy were reported.
Conclusions:
- Continuous intravenous morphine sulfate infusion is an effective and safe method for managing postoperative pain in neonates.
- The therapy demonstrated good tolerability and a positive impact on biochemical markers of pain.
- Further research can build upon these findings for optimized neonatal pain management protocols.