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Intravenous versus intraperitoneal morphine before surgery to provide postoperative pain relief
S H Kalman1, A G Jensen, P O Nyström
1Department of Anaesthesiology, University Hospital, Linköping, Sweden.
Acta Anaesthesiologica Scandinavica
|October 6, 1997
Summary
Intravenous morphine provided better pain relief and reduced postoperative needs compared to intraperitoneal administration after major abdominal surgery. This study highlights differences in pain management and morphine pharmacokinetics.
Area of Science:
- Pharmacology
- Anesthesiology
- Surgical Recovery
Background:
- Opioid receptors are present on peripheral nerves.
- Investigating optimal morphine administration routes is crucial for postoperative care.
Purpose of the Study:
- Compare intravenous (IV) vs. intraperitoneal (IP) morphine for pain, requirements, and recovery after abdominal surgery.
- Characterize IP morphine pharmacokinetics in humans.
Main Methods:
- 30 patients received 50 mg morphine IV or IP in a double-blind manner.
- Pain assessed via visual analogue scale; morphine use, recovery metrics (food intake, flatulence, hospital stay) recorded.
- Plasma morphine and metabolite concentrations measured for 4 hours.
Main Results:
- IV morphine group reported less pain at rest and on coughing post-surgery.
- Lower additional morphine requirements observed in the IV group on postoperative day 1.
- Similar overall recovery times; higher active metabolite (morphine-6-glucuronide) levels in IV group suggest different pharmacokinetics.
Conclusions:
- Intraperitoneal morphine (50 mg) is less effective than IV administration for pain control and reducing postoperative morphine needs after major abdominal surgery.
- Pharmacokinetic differences exist between IV and IP morphine administration.