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Extradural clonidine does not potentiate analgesia produced by extradural morphine after meniscectomy
E J van Essen1, J G Bovill, E J Ploeger
1Department of Anaesthesia, Westeinde Hospital, The Hague, The Netherlands.
Abstract:
We have studied the ability of clonidine to potentiate morphine analgesia in 28 patients (ASA I) after meniscectomy under general anaesthesia. One hour after surgery, morphine 3 mg (n = 10), clonidine 75 micrograms (n = 8) or morphine 3 mg plus clonidine 75 micrograms (n = 10) was injected extradurally. Morphine alone and in combination with clonidine produced similar and significant analgesia as assessed by verbal analogue pain scores. Pain scores did not decrease significantly in patients given clonidine alone. There were statistically, but not clinically significant decreases in systemic arterial pressure after morphine alone and clonidine alone. No patient developed sensory or motor block. One patient given morphine alone developed retention of urine. It is concluded that, in the dose used in this study, clonidine did not potentiate the analgesia produced by extradural morphine.
Insights
Clonidine did not enhance morphine pain relief after knee surgery when administered extradurally. The combination provided similar analgesia to morphine alone, with no significant adverse effects observed.
Area of Science:
- Anesthesiology
- Pharmacology
Background:
- Postoperative pain management is crucial for patient recovery.
- Opioid analgesics like morphine are commonly used but can have side effects.
- Adjuvants are explored to enhance opioid efficacy and reduce dosage.
Purpose of the Study:
- To investigate if clonidine can potentiate morphine-induced analgesia.
- To assess the efficacy and safety of combining extradural morphine and clonidine for postoperative pain control.
Main Methods:
- A randomized study involving 28 patients undergoing meniscectomy under general anesthesia.
- Extradural administration of morphine 3 mg, clonidine 75 micrograms, or a combination of both.
- Pain assessment using verbal analogue pain scores and monitoring of vital signs and neurological block.
Main Results:
- Both morphine alone and the combination of morphine plus clonidine produced significant analgesia.
- Clonidine alone did not significantly reduce pain scores.
- No significant difference in analgesia was observed between morphine alone and the combination.
- Statistically, but not clinically significant, decreases in blood pressure were noted.
- No sensory or motor block occurred.
Conclusions:
- Clonidine, at the tested dose, did not potentiate the analgesic effects of extradural morphine.
- The combination of morphine and clonidine did not offer superior pain relief compared to morphine alone in this study.
- Further research may be needed to explore different dosages or patient populations.