This site became the new on June 19th. Learn more.
Show more Menu IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more... Menu IMPORTANT: Talk with a trusted healthcare professional before volunteering for a study. Read more... Menu
Give us feedback

Mechano-physiological Approach to Anorectal Function

This study has been terminated.
(inadequate no of constip patients)
American College of Gastroenterology
Information provided by:
Penn State University Identifier:
First received: September 14, 2005
Last updated: June 1, 2011
Last verified: September 2009
We hypothesize that defecatory disorders can be described in mechanical terms which would allow a mechanistic description of disorders which would in turn allow better directed biofeedback mechanisms to treat disorders of defecation.

Condition Intervention
Constipation Procedure: defecography

Study Type: Observational
Study Design: Observational Model: Case-Only
Time Perspective: Prospective
Official Title: Mechano-physiological Approach to Normal Anorectal Function and the Classification of Defecatory Disorders

Further study details as provided by Penn State University:

Enrollment: 17
Study Start Date: February 2006
Study Completion Date: May 2011
Primary Completion Date: May 2011 (Final data collection date for primary outcome measure)
Intervention Details:
    Procedure: defecography
    insertion of catheter to record pressure. Insertion of barium to outline rectum and fluoroscopy to define change in rectal contour and expulsion of barium during the study.
Detailed Description:
Disorders of defecation are very common and the process of defecation remains poorly described. This results in a limited approach to treatment of patients, with limited success. This study will simultaneously measure multiple components of the process of defecation - the abdominal wall and perineal muscle activity, the pressure within the rectum and in the anal canal and the change in shape of the anorectal region of the colon, in order to develop a biomechanical model which can describe the normal and abnormal defecatory process. It is anticipated that, by understanding the process in these terms will allow a new approach to categorizing and describing defecation problems which in turn will lead to more specific approaches of treatment which will be tailored to individual patients. These parameters will compared in volunteers with no defecatory disorders and patients with defecatory disorders who are being referred for defecography as part of their clinical evaluation.

Ages Eligible for Study:   18 Years to 80 Years   (Adult, Senior)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
women with no defecatory dysfunctionl


Inclusion Criteria:

  • Women
  • No defecatory problems
  • On no medication which affect bowel habits

Exclusion Criteria:

  • Pregnancy


Inclusion Criteria:

  • Difficulty in defecation
  • Women

Exclusion criteria:

  • Pregnancy
  • Medication which can affect bowel movement
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00219518

United States, Pennsylvania
Hershey Medical Center
Hershey, Pennsylvania, United States, 17033
Sponsors and Collaborators
Penn State University
American College of Gastroenterology
Principal Investigator: Ann Ouyang, MD Penn State College of Medicine and Penn State Milton S. Hershey Medical Center
  More Information

Responsible Party: Deputy director, ACG Institute for Clinical Research and Education Identifier: NCT00219518     History of Changes
Other Study ID Numbers: HY03-368
Study First Received: September 14, 2005
Last Updated: June 1, 2011

Keywords provided by Penn State University:
Pelvic floor dyssynergia

Additional relevant MeSH terms:
Signs and Symptoms, Digestive
Signs and Symptoms processed this record on June 22, 2017