Assessment of laparotomy-induced stress response in opium- and morphine-addicted rats by measuring serum glucose and corticosterone levels: an animal experiment.

BACKGROUND

Surgical procedures induce stress responses similar to severe illnesses, activating the metabolic and neuroendocrine systems, especially the hypothalamic-pituitary-adrenal (HPA) axis. The resulting cortisol surge maintains homeostasis but can adversely affect recovery by elevating blood glucose levels and increasing the risk of complications. Given the high prevalence of opium use, especially in the Middle East and southwestern Asia, and its suspected impact on HPA axis function, this study assesses corticosterone (CS) and glucose as indicators of impaired neuroendocrine responses to surgical stress in an animal model with chronic opioid use.

MATERIALS AND

METHODS

Thirty-six male Wistar rats were randomly assigned to three groups: morphine-addicted, opium-addicted, and control. Addiction was induced by administering increasing doses of morphine or opium in drinking water, as verified by naloxone injections. Laparotomy was performed under ketamine and xylazine anesthesia. Blood samples were collected post-surgery and post-recovery to measure the CS and glucose levels.

RESULTS

This study included 30 rats, with 10 rats per group. Post-surgery, mean CS levels were higher in the control group compared to the addicted groups, although not significantly higher. Thirty minutes post-recovery, CS levels remained elevated in the addicted groups. Mean glucose levels were significantly higher in the control group both immediately and 30 minutes post-recovery, indicating a sustained hyperglycemic response. No significant differences were observed between addicted groups in glucose levels.

CONCLUSION

Our study suggests that chronic opioid use may reduce the neuroendocrine response to surgical stress, as shown by lower CS levels in the addicted rats. This aligns with existing research on opioids and stress responses. However, the small sample size and lack of baseline measurements limit the findings. Future studies should use larger, more diverse samples and additional biomarkers. This pilot study highlights the need for further research on altered stress responses in opioid-addicted patients undergoing surgery, emphasizing the importance of tailored postoperative care.