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Published on: March 20, 2018
Evaluation of anxiety-like behaviour in a rat model of acute postoperative pain
Francois Kouya1, Zohaib Iqbal, Daniel Charen
1From the Pain Research Program, New Jersey Neuroscience Institute and Seton Hall University School of Graduate Medical Education, JFK Medical Center, Edison, New Jersey (FK, ZI, DC, MS, RKB), Department of Developmental Neurobiology, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, New York, USA (RKB) *Francois Kouya and Zohaib Iqbal contributed equally to the writing of the article.
Background:
Unrelieved acute postoperative pain can lead to a wide range of adverse effects, such as anxiety, depression, restlessness and sleep deprivation.
Objective:
To investigate anxiety-like behaviour in a postoperative pain model.
Interventions And Main Outcome Measures:
Mechanical hypersensitivity was assessed with an electronic von Frey device, whereas anxiety-like behaviour was measured with light/dark testing and elevated plus maze testing.
Results:
Rats developed significant mechanical hyperalgesia on 1, 3 and 8 days postsurgery compared with sham-operated rats. There was no reduction in motility between preincision and postincision when animals were allowed to move freely in an open field locomotion test. In light-dark tests, incised animals spent significantly less time than sham rats in the light compartment on the 1st and 3rd postoperative days. However, in an elevated plus maze test, differences between sham and incised rats were only observed on the 8th postoperative day as they spent significantly more time in the open arms. Pretreatment with morphine significantly increased withdrawal thresholds compared with treatment with saline (0.9% NaCl), but had no effect on light or open arm avoidance behaviour.
Conclusion:
We report that a rat model of acute postoperative pain is associated with anxiety-like increased light and open arm avoidance behaviour.
