[Anal sphincter function following colorectal anastomosis with a stapler by transperineal-sphincter approach].

In 4 patients who under went low anterior resection for cancer of mid and lower 1/3 of the rectum, with colo-rectal anastomosis by posterior transphinteric approach, anorectal pressure profiles have been studied by open tip technique 30 d. 6 months following operation. Bowel movements, gas and feces discrimination and anal continence were also controlled. Resting pressure, delta % pressure changes during recto-anal reflex, pressure in voluntary contraction, altered in the first post-operative period, become normal in 6 months. Although volume and pressure at urgent rectal sensation, volume and rectal sensation and compliance altered after surgery did not change after 6 months, suggesting that the reservoir function of the rectum is lost, patients achieved a good control of bowel movements, and a good gas and feces discrimination and anal continence within the first 6 months of operation.