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Significance Of Puborectalis Muscle In Pelvic Floor Disorders | 3519
ISSN: 2161-069X

Journal of Gastrointestinal & Digestive System
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Significance of puborectalis muscle in pelvic floor disorders

2nd International Conference on Gastroenterology & Urology

Ravinder Mittal

AcceptedAbstracts: J Gastrointest Dig Syst

DOI: 10.4172/2161-069X.S1.019

Puborectalis muscle (PRM) is a ?U? or ?sling? shaped muscle that is thought to be a major player in the anal continence function. Current thinking is that it is important for maintaining the anorectal angle (ARA). Studies conducted in our laboratory during last 12 years show new aspects of the PRM function. 1) PRM contraction causes closure of the proximal half of the anal canal. For these studies, we utilized novel techniques of 3D transperineal ultrasound imaging of the pelvis and high definition manometry. 2) PRM forms the inferior margin of the pelvic floor hiatus through which anal canal, vagina and urethra emmerge from the abdominal cavity to the exterior (atmosphere). We hypothesized that contraction of the PRM lifts the anal canal, vagina and uretha ventrally and reduce the size of pelvic floor hiatus, thus compressing all structures contained in it again each other and in turn against the pubic symphsis. Accordingly, we found a high pressure zone in the vagina. Characteristics of the vaginal high pressure zone show tonic or sustained/continuous pressure that increases significantly with voluntary squeeze. Furthermore, we measured directionality of pressures in the vaginal high pressure zone using high definition manometry, 3D-US and magnetic resonance imaging. These studies show that vaginal pressures are distributed in the dorso-ventral direction, which is consistent with the direction of forces related to the shortening of PRM. All of the above studies were conducted in healthy nullipara women. 3) To determine if PRM contraction has a role in the urethral closure function, we conducted studies in rabbits. PRM was stimulated electrically and pressures were recorded using a sleeve sensor. These studies show that PRM contraction increases pressure in the anal canal, vagina and urethra. In fact urethral closure pressure with PRM stimulation was 2-3 times more than with the urethral rhabdosphincter stimulation. In summary, puborectalis muscle, which forms the pelvic floor hiatus causes closure of the anal, vaginal and urethral orifices. Since PRM gets frequently damaged during vaginal delivery, we propose that its dysfunction must play critical role in various pelvic floor disorders.
Ravinder Mittal is a Professor of Medicine and Director of GI function laboratory at the University of California, San Diego. A graduate of University of Delhi in India, he completed clinical and research training in gastroenterology at the Yale University. He was a tenured professor of medicine at the University of Virgina in Charlottesville, Virginia prior to coming to UCSD in 1997. He is the author of more than 100 original papers and 25 book chapters. His research has been funded continuously by NIH since 1988.