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Intra-operative remifentanil might influence pain levels in the immediate post-operative period after major abdominal surgery

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Abstract:

Background: 

Remifentanil, a widely used analgesic agent in anaesthesia, has a rapid onset and short duration of action. In clinical settings, this requires an appropriate pain strategy to prevent unacceptable pain in the post-operative period. The aim of this study was to investigate whether remifentanil had any impact on post-operative pain and opioid consumption after major abdominal surgery. Methods: 

Fifty patients undergoing major abdominal surgery were randomized to receive either remifentanil 0.4 µg/kg/min or placebo intra-operatively, in addition to basic combined general and epidural anaesthesia, in this double-blind study. Patients received patient-controlled analgesia with morphine for 24 h post-operatively. Morphine consumption, assessment of pain at rest and during coughing, side-effects and levels of sensory block were recorded during the first 24 h post-operatively. Results: 

Twenty-one patients receiving remifentanil and 18 patients receiving placebo completed the study. The median visual analogue scale (VAS) score at rest from 0 to 2 h was significantly increased in the remifentanil group [40 mm (27–61 mm)] vs. placebo [13 mm (3–35 mm)] (P < 0.05). No significant differences in morphine consumption, VAS score during coughing or adverse effects were observed between the groups. Conclusion: 

The results are weak and difficult to interpret. They could indicate that a high dose of remifentanil added to otherwise sufficient combined general and epidural anaesthesia may induce opioid-induced hyperalgesia and/or clinically acute opioid tolerance after major abdominal surgery; however, as no significant differences could be observed between the groups after 2 h post-operatively, the clinical relevance of these observations is questionable.

Keywords: acute opioid tolerance; opioid-induced hyperalgesia; post-operative pain; remifentanil

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1399-6576.2005.00861.x

Affiliations: 1: The Danish University of Pharmaceutical Sciences, Copenhagen, and 2: Department of Anaesthesiology, Glostrup University Hospital, Glostrup, Denmark

Publication date: November 1, 2005

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