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Effects of pelvic floor muscle contraction on anal canal pressure

Title
Effects of pelvic floor muscle contraction on anal canal pressure
Authors
Padda B.S.Jung S.-A.Pretorius D.Nager C.W.Den-Boer D.Mittal R.K.
Ewha Authors
정성애
SCOPUS Author ID
정성애scopus
Issue Date
2007
Journal Title
American Journal of Physiology - Gastrointestinal and Liver Physiology
ISSN
0193-1857JCR Link
Citation
vol. 292, no. 2, pp. G565 - G571
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The role of pelvic floor muscle contraction in the genesis of anal canal pressure is not clear. Recent studies have suggested that vaginal distension increases pelvic floor muscle contraction. We studied the effects of vaginal distension on anal canal pressure in 15 nullipara asymptomatic women. Anal pressure, rest, and squeeze were measured using station pull-through manometry techniques with no vaginal probe, a 10-mm vaginal probe, and a 25-mm vaginal probe in place. Rest and squeeze vaginal pressures were significantly higher when measured with the 25-mm probe compared with the 10-mm probe, suggesting that vaginal distension enhances pelvic floor contraction. In the presence of the 25-mm vaginal probe, rest and squeeze anal pressures in the proximal part of the anal canal were significantly higher compared with no vaginal probe or the 10-mm vaginal probe. On the other hand, distal anal pressures were not affected by any of the vaginal probes. Ultrasound imaging of the pelvic floor revealed that vaginal distension increased the anterior-posterior length of the puborectalis muscle. Atropine at 15 μg/kg had no influence on the rest and squeeze anal pressures with or without vaginal distension. Our data suggest that pelvic floor contractions increase pressures in the proximal part of the anal canal, which is anatomically surrounded by the puborectalis muscle. We propose that pelvic floor contraction plays an important role in the fecal continence mechanism by increasing anal canal pressure. Copyright © 2007 the American Physiological Society.
DOI
10.1152/ajpgi.00250.2006
Appears in Collections:
의학전문대학원 > 의학과 > Journal papers
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