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Ileocecal valve dysfunction in small intestinal bacterial overgrowth: a pilot study.
Larry S Miller1, Anil K Vegesna, Aiswerya Madanam Sampath
1Department of Medicine, Section of Gastroenterology, Hofstra Northshore Long Island Jewish Hospital, School of Medicine at Hofstra University, Manhasset, NY 11030, USA. larrymillergastro@yahoo.com
World Journal of Gastroenterology
|December 15, 2012
Summary
Patients with a defective ileocecal valve (ICV) reflex show signs of small intestinal bacterial overgrowth, indicated by abnormal lactulose breath tests. These individuals also report more severe gastrointestinal symptoms, suggesting a link between ICV function and digestive health.
Area of Science:
- Gastroenterology
- Digestive Physiology
- Microbiome Research
Background:
- The ileocecal valve (ICV) regulates the passage of contents from the small intestine to the large intestine.
- A defective ICV or cecal distension reflex may contribute to gastrointestinal disorders.
- Small intestinal bacterial overgrowth (SIBO) is a condition characterized by excessive bacteria in the small intestine.
Purpose of the Study:
- To investigate the association between a defective ileocecal valve (ICV)/cecal distension reflex and the presence of small intestinal bacterial overgrowth (SIBO).
- To compare the ICV pressure responses during cecal insufflation in individuals with and without SIBO.
- To evaluate the correlation between ICV function, SIBO, and reported gastrointestinal symptoms.
Main Methods:
- Utilized colonoscopy with manometry catheter to measure pressures within the terminal ileum (TI) and ICV.
- Performed air insufflation into the cecum up to 40 mmHg to assess the ICV/cecal distension reflex.
- Conducted lactulose breath testing one month post-colonoscopy to diagnose SIBO and compared results with manometry findings.
Main Results:
- Subjects with positive lactulose breath tests (indicating SIBO) exhibited significantly lower peak ICV pressures and a reduced pressure difference between the ICV and cecum during air insufflation compared to those with normal tests.
- The ICV pressure response was significantly higher in individuals with normal breath tests than in those with positive tests.
- Individuals with SIBO reported significantly higher symptom scores for early satiety, loss of appetite, and bloating.
Conclusions:
- A defective ileocecal valve (ICV) cecal distension reflex is associated with small intestinal bacterial overgrowth (SIBO).
- Individuals with SIBO demonstrate impaired ICV pressure responses.
- A defective ICV reflex correlates with increased gastrointestinal symptom severity in patients.
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