The role of free radical oxidation in damage of the stomach and duodenum after limiting resection of the liver (experimental study)

Abstract

Maximum allowable liver resections are the operation of choice for patients with focal formations while the problem of ulcerative gastrointestinal bleeding after such operations remains relevant. Under the conditions of perioperative stress, free radical oxidation processes are activated and exert a detrimental effect on organs and tissues. Therefore, the aim of our study was to evaluate parameters of free radical oxidation in the stomach and duodenum in the early postoperative period after the maximum allowable liver resection and to determine the time of initial changes in these organs. The study was performed on 70 white outbred male rats weighing 200-230 g. Liver resection was performed according to the original method in 60 rats; the control group consisted of 10 intact rats. After 6, 12 h, 1, 3, 7, and 30 days, the stomach and duodenum were excised for a chemiluminescence study of homogenates and a histological study of preparations. Results of the study showed that the activation of free radical oxidation occurred already at 12 h after the surgery. The peak changes occurred at 12 h in the duodenum and at 24 h in the stomach. Structural changes in these organs were observed at 12 h and were evident as erosions and ulcers. In the stomach, these changes were irreversible, since they were replaced with a scar whereas in the duodenum, they were reversible, since they were replaced with almost mature epithelium in the late postoperative period.