The effect of tadalafil on anastomotic healing in ischemic small intestine in rats.

PURPOSE: To investigate the effect of tadalafil on anastomotic healing in an ischemic small intestine.
METHODS: Standardized transection and anastomosis in the small intestine were performed in 48 male Sprague-Dawley rats divided into four equal groups (n = 12): group 1, normal anastomosis; group 2, ischemic anastomosis; group 3, normal anastomosis+tadalafil treatment; group 4, ischemic anastomosis+tadalafil treatment. Ischemia was established by ligating 2 cm of mesentery on either side of the anastomosis. Tadalafil was given to the rats once a day at dose of 5 mg/kg. The anastomotic bursting pressures and hydroxyproline concentrations were measured on postoperative day 4. A histopathological evaluation of the anastomoses was also performed.
RESULTS: The bursting pressure and hydroxyproline concentration in group 2 were significantly lower than those in the other groups. There was no difference in the hydroxyproline concentration among groups 1, 3, and 4. While there was no difference between groups 3 and 4, the bursting pressures were significantly higher in groups 3 and 4 than in group 1. The histopathological evaluation revealed no significant differences in inflammatory cell infiltration, vascularization, or anastomotic collagen deposition among the groups.
CONCLUSION: Tadalafil treatment improved the anastomotic bursting pressure and the hydroxyproline concentration in both normal and ischemic small intestine anastomosis.