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Investigation of Cortico-Rectal Pathways in Healthy Subjects (Aim 2)

The recruitment status of this study is unknown because the information has not been verified recently.
Verified March 2011 by University of Iowa.
Recruitment status was  Recruiting
Sponsor:
Information provided by:
University of Iowa
ClinicalTrials.gov Identifier:
NCT01300897
First received: August 18, 2010
Last updated: March 7, 2011
Last verified: March 2011
History of Changes
  Purpose

Biofeedback therapy improves bowel symptoms and anorectal function in patients with dyssynergic defecation, however its mechanism of action is not known. The investigators hypothesize that biofeedback therapy enhances gut-brain-gut communication by altering cortical processing of information and improving cortically mediated neuromuscular function of the gut. However, in order to better understand these mechanisms in patients, the investigators need to examine and establish normative data and compare findings with healthy subjects. The investigators specific aims are to examine and evaluate the following 40 normal subjects; (1) To evaluate the afferent cortical evoked potentials in response to the electrical stimulation of the anorectum and (2) To evaluate the corticofugal tracts (efferent) by recording the anal and rectal electromyographic responses following noninvasive lumbosacral and transcranial magnetic stimulation.


Condition
Healthy Volunteers

Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Prospective
Official Title: Investigation of Cortico-Rectal Pathways in Healthy Subjects

Further study details as provided by University of Iowa:

Primary Outcome Measures:
  • Describe latencies and amplitudes between the brain and gut in healthy volunteers [ Time Frame: 1 visit of 3 hours ] [ Designated as safety issue: No ]

    Measurements & Analysis: The latency, inter-peak latency and amplitude of each component of the cortical evoked potentials will be averaged to obtain group mean data.

    Statistical Analysis: The paired t-test or Wilcoxon signed-rank test will be used to compare the latencies.

    Lumbosacral and Transcranial Magnetic Stimulation (TMS) Data and Statistical Analysis: Mean latency and mean amplitude for each individual will be calculated.



Estimated Enrollment: 50
Study Start Date: August 2005
Estimated Study Completion Date: December 2012
Estimated Primary Completion Date: December 2012 (Final data collection date for primary outcome measure)
Groups/Cohorts
Healthy Volunteer

  Eligibility

Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes
Sampling Method:   Probability Sample
Study Population

40 Healthy volunteers.

Criteria

Inclusion criteria:

  • Right-handed adults between ages 18 years and 99 years, who are free of bowel disorders or other medical illnesses.

Exclusion Criteria:

  • Potential subjects with comorbid illnesses; severe cardiac disease, chronic renal failure or previous gastrointestinal surgery except cholecystectomy and appendectomy.
  • Neurologic diseases e.g.; head injury, epilepsy, multiple sclerosis, strokes, spinal cord injuries.
  • People who have metal in their skull or under the skull, or have metal in the back or hips.
  • People who have a cardiac pacemaker, implanted defibrillator or medication pump.
  • Impaired cognizance (mini mental score of < 15) and/or legally blind.
  • Pregnant or likely to conceive during the course of the study. Women with potential for pregnancy must be willing to use contraceptive measures during the study.
  • Previous pelvic surgery, rectocele repair, bladder repair, radical hysterectomy.
  • Rectal prolapse or anal fissure or anal surgery.
  Contacts and Locations
Please refer to this study by its ClinicalTrials.gov identifier: NCT01300897

Locations
United States, Iowa
University of Iowa Hospitals and Clinics Recruiting
Iowa City, Iowa, United States, 52242
Contact: Satish SC Rao, MD, PhD     319-353-6602     satish-rao@uiowa.edu    
Sponsors and Collaborators
University of Iowa
Investigators
Principal Investigator: Satish SC Rao, MD, PhD University of Iowa
  More Information

No publications provided

Responsible Party: Satish SC Rao/Professor of Internal Medicine and Director of Neurogastroenterology and GI Motility, University of Iowa
ClinicalTrials.gov Identifier: NCT01300897     History of Changes
Other Study ID Numbers: 5R01DK057100-2
Study First Received: August 18, 2010
Last Updated: March 7, 2011
Health Authority: United States: Institutional Review Board

Keywords provided by University of Iowa:
cortical function, motor evoked potential responses

ClinicalTrials.gov processed this record on May 23, 2013