Brain-Gut Interactions in Overweight and Normal Weight Patients With Chronic Abdominal Pain

Stopped early

Conditions studied: Obesity, Stress, Irritable Bowel Syndrome, Women, Abdominal Pain

In brief

About 15 to 20 percent of individuals living in the United States have chronic abdominal pain, often of unknown origin, which is often difficult to diagnose and treat. One possible cause of chronic abdominal pain is an inflammation of the intestines, but it is not known whether the two are related. Furthermore, although overweight people tend to be more likely to have increased inflammation, it is not known whether there is a connection between increased body weight and chronic abdominal pain. This study will examine the relationship between symptoms of chronic abdominal pain and intestinal inflammation by comparing the medical test results of normal weight and overweight patients who have a history of chronic abdominal pain. This study will include 224 subjects, who must be men and women between the ages of 13 and 45. Half the subjects will be healthy participants, and half will have had chronic abdominal pain of unknown origin for longer than 6 months. Female participants must take a urine pregnancy test before starting the study, and will not be allowed to participate if the test is positive. During the study, patients will visit the NIH Clinical Center on two occasions for testing. On the first visit, patients will provide a medical history, including information about current medications or natural remedies and tobacco and alcohol use, and will also fill out questionnaires to provide information about symptoms, current levels of gastrointestinal pain, and general quality of life. The study researchers will conduct a physical examination, measure patients height and weight, and draw blood for testing. Patients will be asked to not eat or drink anything for 8 hours before the second visit, and will be asked to bring a bathing suit and a swim cap to the Clinical Center. On the day of the visit, patients will fill out questionnaires to provide information about symptoms, current levels of gastrointestinal pain, and general quality of life. Patients will also provide a blood sample for testing. Researchers will measure patients blood pressure and heart rate, height, weight, waist/hip circumference, and intra-abdominal measurement. Patients will also be asked to put on the bathing suit and swim cap to have their body fat measured using a machine called the BOD POD. To test the gastrointestinal system, patients will then be asked to drink a sugar-based test solution, and researchers will collect all voided urine for the next 5 to 6 hours. (Patients may drink water during this time.) On either Day 1 or Day 2 of the study, patients will sip, swish and spit an additional sweet taste solution. Patients will sip, swish, and spit different concentrations of this sweet taste solution, for a total of 25 tastings of this solution. Subjects will then complete questionnaires about their sweetness preferences related to these 25 tastings.

Key facts

Study ID: NCT00824941
Run by: National Institute of Nursing Research (NINR)
People needed: 132
Starts: 2009-02-06
Expected to finish: 2019-11-13
Last updated by the study team: 2019-11-20

Who can join

Age: 13 and older, up to 45. Sex: any. Healthy volunteers: accepted.

You may not qualify if…

Patients with any of the following will be excluded:
Have a history of an organic GI disease (e.g., inflammatory bowel disease, celiac disease, biliary disorders, bowel resection) cardiac, pulmonary, neurologic, renal, endocrine, or gynecological pathology
Are currently taking medications for GI symptoms daily such as 5-HT3 antagonists/5-HT4 agonists, prokinetic drugs, laxatives (but not fiber supplements), anti-diarrheals or antispasmodics
Are currently taking other medications daily that would alter serotonin (e.g., serotonin specific reuptake inhibitors [SSRI]), catecholamines (e.g., tricycle antidepressants but not inhaled beta-agonist for mild-moderate asthma), cortisol (excluding inhaled corticosteroids)
Work during the late evening and night (as cortisol levels may be altered)
Severe co-morbid pain or psychiatric conditions (e.g., fibromyalgia, bipolar or psychotic disorder)
Take greater than 300 mg of caffeine containing beverages or food (e.g. chocolate) in the afternoon-evening or greater than 2 servings of alcohol containing beverages everyday (decaffeinated coffee is acceptable)
Are unable to give informed consent
Are unable to physically use the touch screen for the purpose of the study
Are visually impaired or currently institutionalized
Females who are pregnant or lactating
NINR employees, subordinates/relatives/ or co-workers
Any NIH employee who is a subordinate/relative/or co-worker of a study investigator

Where it is running

National Institutes of Health Clinical Center, 9000 Rockville Pike — Bethesda, Maryland, United States

Full record on ClinicalTrials.gov

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