Resting Pressure

The mean resting pressure in healthy volunteers ranges from 40 to 70mmHg. The internal anal sphincter generates the majority of the resting pressure.4 This smooth muscle is in a continuous state of maximal contraction accounting for 55% to 60% of resting tone. The external anal sphincter contributes less to the resting anal tone. The final determinant of resting anal tone is the contribution of the hemorrhoidal plexi. Patients with alterations in continence related to the internal anal sphincter often have low baseline resting pressure.

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