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Intraoperative tramadol reduces shivering but not pain after remifentanil–isoflurane general anaesthesia. A placebo-controlled, double-blind trial

Published online by Cambridge University Press:  01 June 2008

F. Heid*
Affiliation:
Johannes Gutenberg-University, Department of Anaesthesiology, Mainz, Germany
U. Grimm
Affiliation:
Johannes Gutenberg-University, Department of Anaesthesiology, Mainz, Germany
W. Roth
Affiliation:
Johannes Gutenberg-University, Department of Anaesthesiology, Mainz, Germany
T. Piepho
Affiliation:
Johannes Gutenberg-University, Department of Anaesthesiology, Mainz, Germany
T. Kerz
Affiliation:
Johannes Gutenberg-University, Department of Neurosurgery, Mainz, Germany
J. Jage
Affiliation:
Johannes Gutenberg-University, Department of Anaesthesiology, Mainz, Germany
*
Correspondence to: Florian Heid, Department of Anaesthesiology, Johannes Gutenberg-University, Langenbeckstr. 1, 55131 Mainz, Germany. E-mail: heid@uni-mainz.de; Tel: +49 6131 176755; Fax: +49 6131 176649
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Summary

Background and objective

Postoperative shivering and pain are frequent problems in patients recovering from anaesthesia with particularly high incidences being observed after remifentanil–isoflurane-based general anaesthesia. The opioid tramadol is generally effective in preventing shivering and treating pain, but its effects are not characterized after remifentanil-based general anaesthesia. This randomized, placebo-controlled, double-blind study evaluated the effects of intraoperative intravenous tramadol on postoperative shivering and pain after remifentanil-based general anaesthesia.

Methods

After Ethics Committee approval, 60 patients scheduled for lumbar disc surgery were included. Surgery was performed under general anaesthesia (remifentanil, isoflurane). Patients were randomly assigned to receive 2 mg kg−1 tramadol in 30 mL 0.9% saline infused intravenously (n = 30) or 30 mL saline (n = 30) 45–30 min before skin closure. The following parameters were assessed every 10 min for 2 h: shivering, pain, postoperative nausea and vomiting, sedation, heart rate, non-invasive blood pressure and peripheral oxygen saturation. The primary outcome variable was the incidence of shivering during the first 2 postoperative hours. Secondary variables were: shivering intensity, pain, postoperative nausea and vomiting, sedation, heart rate, non-invasive blood pressure and peripheral oxygen saturation.

Results

Shivering was less frequent in patients treated with tramadol (20% vs. 70%, P = 0.0009) and was of lower intensity (severe shivering: 10% vs. 46.7%, P = 0.003). Pain scores were similar between the groups and all other secondary outcome variables failed to reveal significant differences.

Conclusions

Compared with placebo, intraoperative intravenous administration of 2 mg kg−1 tramadol reduces the incidence and extent of postoperative shivering without alterations in pain perception after lumbar disc surgery under remifentanil–isoflurane-based general anaesthesia.

Type
Original Article
Copyright
Copyright © European Society of Anaesthesiology 2008

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