Effect of omentectomy on peritoneal defence mechanisms in rats.
OBJECTIVE
To assess the effect of omentectomy on peritoneal defence mechanisms in rats.


METHODS
Randomised study.


METHODS
Sixty Wistar Albino rats.


METHODS
Rats were divided in three groups of 20. All rats underwent midline laparotomy and 10 rats in each group had omentectomy. Samples were taken two hours (early period) and 30 days (late period) after omentectomy.


METHODS
Effect of omentectomy on bactericidal activity of peritoneal fluid (PBA), chemotactic indices (CI) of polymorphonuclear leucocytes (PMNL), phagocytic activity of PMNL in the peritoneal fluid (PHA), total cell counts, and cell types of peritoneal washing fluid.


RESULTS
In the early period omentectomy reduced total cell counts from 3440 (1400-4800) x 10(6)/10 ml to 1480 (800-2080) x 10(6)/10 ml (p = 0.0022), and the CI of PMNL from 2.86 (2.32-4.02) to 1.43 (1.29-1.77) (p = 0.0002), and increased the PHA from 11.9 (8.3-17) to 17 (16-19) (p = 0.0006). The PBA was not significantly altered. The proportion of macrophages decreased (p = 0.0001), while the proportion of lymphocytes increased in the peritoneal fluid (p = 0.0002). In the late period total cell counts in the control and omentectomy groups were 3440 (1400-4800) x 10(6) and 3160 (1040-5120) x 10(6)/10 ml fluid, respectively (p = 0.52). Omentectomy reduced the CI of PMNL from 2.86 (2.32-4.02) to 2.01 (1.82-1.49) (p = 0.0003). The difference between the proportion of PHA of either group was not significant (p = 0.06). PBA in the control and omentectomy groups was 99.03 (70-100) and 99.48 (71.5-100), respectively (p = 0.97). Although the total cell count in the peritoneal fluid did not differ, the proportion of macrophages decreased (p = 0.0003) while the proportion of lymphocytes increased (p = 0.0002). The proportion of PMNL did not change in either of the experimental settings.


CONCLUSIONS
The omentum has an important role in local peritoneal defence mechanisms in experimental conditions. Its removal may effect some of these mechanisms adversely.
Agalar
F
F
Department of General Surgery, Hacettepe University School of Medicine, Ankara, Turkey.
Sayek
I
I
Cakmakçi
M
M
Hasçelik
G
G
Abbasoglu
O
O
D000818:Animals; D001202:Ascitic Fluid / Q000382:microbiology*; D002630:Chemotactic Factors / Q000096:biosynthesis; D004195:Disease Models, Animal; D007958:Leukocyte Count; D007963:Leukocytes, Mononuclear / Q000276:immunology*; D008264:Macrophages; D009852:Omentum / Q000601:surgery*; D010538:Peritonitis / Q000276:immunology*; D010587:Phagocytosis / Q000276:immunology*; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar; D012016:Reference Values
D002630:Chemotactic Factors