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Open Access Duration of Effects on Clinical Parameters and Referred Hyperalgesia in Rats after Abdominal Surgery and Multiple Doses of Analgesic

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This study evaluated the duration of clinical effects and referred hyperalgesia in rats (n = 10 per group) undergoing abdominal surgery with analgesics (ketoprofen at 3 mg/kg and buprenorphine at 0.01 or 0.1 mg/kg) administered intramuscularly twice daily for 72 h beginning prior to surgery; no-surgery and no-analgesia control groups were included. Food and water consumption and body weight were monitored daily. As a measure of referred hyperalgesia, tail-flick latency was measured daily, before and 4 h after analgesia administration. Compared with those of the no-surgery controls, significant decreases in food consumption and body weight occurred 24 h after surgery without analgesics. There were nonsignificant reductions in these effects by analgesics, but the benefits were not significantly different than those of saline. These parameters continued to be decreased with variable significance in the buprenorphine groups at 48 and 72 h after surgery. In both buprenorphine-treated groups, water consumption was significantly increased at 24 h after surgery but not at 48 or 72 h. Tail-flick latency was not significantly different between the no-surgery and no-analgesia groups but was significantly increased 4 h after high-dose buprenorphine administration and declined nonsignificantly over time in the other groups. We conclude that painful effects from surgery are present primarily during the first 24 h after surgery. The analgesic regimens tested did not completely reduce these effects. Buprenorphine was associated with adverse effects for as long as 72 h after surgery. Referred hyperalgesia from this abdominal surgery could not be measured using the tail-flick assay.

Document Type: Research Article

Affiliations: 1: Departments of Veterinary Resources, Greenfield Laboratories, EliLilly and Company, 2001 W. Main St. Greenfield, Indiana 46140 2: Global Statistical Sciences, Greenfield Laboratories, EliLilly and Company, 2001 W. Main St. Greenfield, Indiana 46140 3: Departments of Veterinary Resources, Greenfield Laboratories, EliLilly and Company, 2001 W. Main St. Greenfield, Indiana 46140, School of Veterinary Medicine, Purdue University, 625 Harrison St., West Lafayette, Indiana 47907

Publication date: 2005-08-01

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  • Comparative Medicine (CM), an international journal of comparative and experimental medicine, is the leading English-language publication in the field and is ranked by the Science Citation Index in the upper third of all scientific journals. The mission of CM is to disseminate high-quality, peer-reviewed information that expands biomedical knowledge and promotes human and animal health through the study of laboratory animal disease, animal models of disease, and basic biologic mechanisms related to disease in people and animals.

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