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Comparison of the analgesic efficacy and plasma concentrations of high-dose intra-articular and intramuscular morphine for knee arthroscopy

  • N. Raj (a1), A. Sehgal (a1), J. E. Hall (a1), A. Sharma (a1), K. R. Murrin (a1) and N. D. Groves (a1)...

Extract

Summary

Background and objective: It is important to provide good postoperative analgesia after discharge from day case surgery. The usefulness of intra-articular morphine for analgesia after day case knee arthroscopy remains controversial. A large dose of morphine intra-articularly may provide a good long-lasting analgesia, but its efficacy and pharmacokinetics are not known and may be no better than intramuscular morphine. We compared the effect of 10 mg intra-articular and intramuscular morphine for 24 h post-injection in a randomized double-blind study.

Methods: Forty adults undergoing knee arthroscopy were recruited and received either 10 mg morphine intra-articularly or intramuscularly. Our primary outcome was overall visual analogue assessment of pain (0–100 mm scale where 0 is no pain and 100 is worst possible pain) between 4 h (on discharge) and 24 h (postoperatively). Plasma morphine concentrations were measured at 15 min, and 1, 2, 4 and 24 h. The use of additional analgesia was noted.

Results: The assessment of pain experienced between discharge (4 h) and 24 h was significantly better in the intra-articular (n = 20; mean ± SD: 18 ± 19) than the intramuscular (n = 19; mean ± SD: 34 ± 20) group (P = 0.027). The number of patients consuming any additional analgesia between discharge and 24 h was significantly lower in the intra-articular morphine group (P = 0.038), with 4 (20%) patients in the intra-articular group and 11 (60%) patients in the intramuscular group consuming supplementary analgesia. There were no differences in plasma morphine concentrations between the groups.

Conclusions: A large dose of intra-articular morphine provided better analgesia than the same dose of intramuscular morphine, low plasma morphine levels suggesting a peripheral mechanism.

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Corresponding author

Correspondence to: Naveen Raj, Department of Anaesthetics and Intensive Care Medicine, University Hospital of Wales, Cardiff CF14 4XN, UK. E-mail: naveenraj@doctors.org.uk

Footnotes

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The results of the study were presented at the 2002 Annual Scientific Meeting of the Association of Anaesthetists of Great Britain and Ireland, in Bournemouth, UK.

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References

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Keywords

Comparison of the analgesic efficacy and plasma concentrations of high-dose intra-articular and intramuscular morphine for knee arthroscopy

  • N. Raj (a1), A. Sehgal (a1), J. E. Hall (a1), A. Sharma (a1), K. R. Murrin (a1) and N. D. Groves (a1)...

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