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Intrathecal morphine dose-response data for pain relief after cholecystectomy
H Yamaguchi1, S Watanabe, K Motokawa
1Department of Anesthesia, Mito Saiseikai General Hospital, Japan.
Anesthesia and Analgesia
|February 1, 1990
Summary
Low-dose intrathecal morphine effectively manages pain after cholecystectomy. Doses between 0.06-0.12 mg provide optimal pain relief without significant respiratory depression or increased vomiting.
Area of Science:
- Anesthesiology
- Pharmacology
Background:
- Post-cholecystectomy pain management is crucial for patient recovery.
- Intrathecal morphine is an option for postoperative analgesia, but optimal dosing requires investigation.
Purpose of the Study:
- To determine the optimal dose of low-dose intrathecal morphine for pain relief after cholecystectomy.
- To evaluate the incidence of side effects, including respiratory depression and vomiting, at different morphine doses.
Main Methods:
- A randomized study involving 139 patients undergoing cholecystectomy.
- Administration of preservative-free morphine hydrochloride (0.00-0.20 mg) with hyperbaric tetracaine during spinal anesthesia.
- Assessment of pain relief and side effects over 48 hours post-surgery.
Main Results:
- Significant pain relief was observed with doses of 0.06 mg and higher for the first 24 hours.
- Increased incidence of respiratory depression occurred with higher doses (0.15-0.20 mg).
- Lower doses (0.04-0.10 mg) showed a significantly lower incidence of vomiting compared to the placebo group.
Conclusions:
- The optimal dose range for intrathecal morphine after cholecystectomy is 0.06-0.12 mg.
- This dose range provides effective pain relief while minimizing the risk of respiratory depression and gastrointestinal side effects.