Internal Anal Sphincter Function Following Lateral Internal Sphincterotomy for Anal Fissure: A Long-term Manometric Study

摘要

Fifty patients who underwent lateral internal sphincterotomy were evaluated by manometry 1 month before surgery and 1, 3, 6, and 12 months following surgery. The manometric study showed a decrease in pressure 1 month after surgery and a gradual rise at each evaluation up to a plateau at 12 months. Lateral internal sphincterotomy caused a significant decline in resting anal pressure and gradual rise indicating recovery but still remained significantly lower than before surgery.