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Anorectal manometry studies during balloon inflation. Upper column shows pressure of the balloon inflation, and lower part shows effect on anorectal canal. Pressures are visualized gradually by colors from dark blue (lowest pressure = 0 mm Hg) to red (highest pressure = 200 mm Hg). A: present rectoanal inhibitory reflex (RAIR), B: absent RAIR, C: absent RAIR with "pressure column"
