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Epidural anaesthesia with bupivacaine does not cause increased oedema in small gut anatomoses in pigs

Published online by Cambridge University Press:  28 January 2005

A. Fedder ,
R. Dall ,
S. Laurberg  and
S. Å. Rodt
A. Fedder
Affiliation:
Aarhus University Hospital, Unit of Colorectal Surgery, Århus, Denmark Aarhus University Hospital, Department of Anaesthesiology, Århus, Denmark
R. Dall
Affiliation:
Aarhus University Hospital, Department of Anaesthesiology, Århus, Denmark
S. Laurberg
Affiliation:
Aarhus University Hospital, Unit of Colorectal Surgery, Århus, Denmark
S. Å. Rodt
Affiliation:
Aarhus University Hospital, Department of Anaesthesiology, Århus, Denmark
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Abstract

Summary

Background and objective: Epidural analgesia is widely used for abdominal surgery due to the properties of ‘stress-free’ anaesthesia and superior pain control. Nevertheless, sympathomimetics are known to antagonize inflammation. The present study was performed to investigate if epidural local anaesthetics caused increased local oedema formation.

Methods: Thirty Dansk Landrace pigs were randomized into three groups: epidural bupivacaine, epidural morphine or intravenous (i.v.) fentanyl. All animals were anaesthetized with isoflurane and i.v. midazolam and received an identical fluid regimen. Six small bowel resections were performed over a 3-h period and during the following 3 h the anastomoses were resected. Primary end-points were water content in small bowel and mesentery samples before and after gut anastomosis, lymph flow and urine production.

Results: The water content in the small bowel samples was not changed by surgery or by the different anaesthetic protocols. In the mesenteric tissue, there was a highly significant increase in water content of the post-anastomotic samples compared to pre-anastomotic samples (P < 0.001) and a significant time treatment interaction was revealed (P < 0.05) suggesting an increase in oedema formation in the epidural local anaesthetic group. Lymph flow did not change during the experiments and there were no significant differences between the groups (P = 0.80). The mean total urine output was 44% higher in the epidural morphine group compared to the local anaesthetic group (P = 0.17).

Conclusions: Surgery did not increase gut wall water content, but acute oedema formation resulted in the peri-resectional mesenterial tissue, more prominently so in the bupivacaine group.

Keywords

ANAESTHESIA, EPIDURAL, bupivacaine, opioids, adverse effectsANASTOMOSIS SURGICAL, adverse effects, anastomotic breakdownOEDEMA, local tissue, intestine, mesenteryINFLAMMATIONSWINE
Type
Original Article
Information
European Journal of Anaesthesiology , Volume 21 , Issue 11 , November 2004 , pp. 864 - 870
Copyright
2004 European Society of Anaesthesiology

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