The influence of omentectomy on bacterial clearance: an experimental study.

BACKGROUND The influence of an omentectomy on peritoneal defense mechanisms and its clinical consequences have not been fully elucidated. In the present study, we aimed to investigate the influence of omentectomy on bacterial growth in blood and tissue specimen cultures in rats with experimental peritonitis. METHODS Fifty Wistar-Albino rats were included in the present study. Animals were assigned into five groups as follow: Group 1 (n = 10), omentectomy alone; Group 2 (n = 10), omentectomy + bacterial peritonitis; Group 3 (n = 10), bacterial peritonitis alone; Group 4 (n = 10), laparotomy alone; and Group 5 (n = 10), sham group. Culture positivity rate and bacterial growth (colony forming units [CFU]/gram tissue) were assessed in mesenteric lymphoid tissue and venous blood of all animals. RESULTS Bacterial growth in lymphoid tissue was significantly higher in Groups 2 and 3 than others (both, p < 0.05). CFU of Escherichia coli in lymphoid tissue was significantly higher in Group 2 than in Groups 1 and 3 (both, p < 0.05/4). Blood culture positivity was significantly higher in Group 2 than the others (both, p < 0.05). CONCLUSION The omentum has an important role in the host peritoneal defense system. Peritoneal infection may pursue a more severe course with increased bacterial entrance into the blood in the absence of the omentum.