Opioid use after propofol or sevoflurane anesthesia: a randomized trial

Area of Science:

• Anesthesiology
• Pharmacology
• Pain Management

Background:

• Propofol, an intravenous anesthetic, acts as a gamma-aminobutyric acid A receptor agonist.
• Propofol's analgesic effects involve peripheral nociceptive transmission depression, NMDA receptor antagonism, and GABA-A receptor activation in dorsal root ganglion cells.
• The clinical significance of intraoperative propofol for postoperative analgesia remains unclear.

Purpose of the Study:

• To test the hypothesis that sevoflurane anesthesia requires greater postoperative opioid quantities than propofol anesthesia.
• To compare postoperative opioid consumption and pain scores between patients receiving sevoflurane and propofol.

Main Methods:

• Ninety patients undergoing open vein stripping were randomized to sevoflurane or propofol anesthesia.
• Postoperative pain was managed with piritramide and patient-controlled morphine hydrochloride.
• The primary outcome was total opioid use from surgery end to the next morning; pain scores were recorded on an 11-point scale.

Main Results:

• Median morphine sulfate equivalents were 9.8 mg (sevoflurane group) and 10 mg (propofol group).
• Sevoflurane was not superior to propofol in postoperative opioid consumption (P = 0.74).
• No significant difference in pain scores was observed between the groups over time (P = 0.31).

Conclusions:

• Intraoperative sevoflurane anesthesia did not reduce postoperative analgesia compared to propofol.
• The findings align with previous research suggesting sevoflurane does not provide superior postoperative pain relief.
• The study was registered at ClinicalTrials.gov (NCT00712517).