Spontaneous anorectal pressure activity. Evidence of internal anal sphincter contractions in response to rectal pressure waves.

Abstract:

:To characterize spontaneous anorectal pressure activity and a possible relation between the activity in the rectum and the anal canal, 11 healthy female volunteers were investigated. Resting activities were obtained during 1-h recordings with a multi-channel perfused catheter measuring the pressure 1, 2, 3, 7, and 8 cm from the anal verge. In five subjects sequences of rhythmic rectal pressure waves with amplitudes exceeding the maximal anal resting pressure coincided with a similar internal anal sphincter activity, preventing rectal pressure from exceeding the anal pressure at any point. The mean frequency was 5 x min-1 (range, 3-6 x min-1). This may well be a reflex mechanism by which the internal anal sphincter prevents incontinence in the resting state. Low-frequency pressure waves, not previously described, were detected in four women. These pressure waves were attributed to the internal anal sphincter and were named ultra-slow waves type II. The mean frequency and amplitude were 0.16 x min-1 (range, 0.15-0.17 x min-1) and 24 cm H2O (range, 11-41 cm H2O), respectively. The function of these pressure waves is unknown.

journal_name

Scand J Gastroenterol

authors

Sørensen SM,Gregersen H,Sørensen S,Djurhuus JC

doi

10.3109/00365528909092248

subject

Has Abstract

pub_date

1989-01-01 00:00:00

pages

115-200

issue

1

eissn

0036-5521

issn

1502-7708

journal_volume

24

pub_type

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