Anal sphincteric pressure in fissure-in-ano before and after lateral internal sphincterotomy

Abstract
Resting anal canal pressure was measured in 15 patients with anal fissure before and after lateral internal sphincterotomy. This pressure was significantly higher in these subjects (mean 95 .+-. 23.08 mm HG) than in the control group (mean 66.10 .+-. 14.28 mm Hg) before surgery (P < 0.005). After surgery, a normal and canal pressure was produced. Anal canal spasm apparently is responsible for chronicity of anal fissures.

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