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Study finds structural brain alterations in patients with irritable bowel syndrome
Date:7/22/2010

t UCLA. "Also, the finding removes the idea once and for all that IBS symptoms are not real and are 'only psychological.' The findings will give us more insight into better understanding IBS."

Researchers employed imaging techniques to examine and analyze brain anatomical differences between 55 female IBS patients and 48 female control subjects. Patients had moderate IBS severity, with disease duration from one to 34 years (average 11 years). The average age of the participants was 31.

Investigators found both increases and decreases of brain grey matter in specific cortical brain regions.

Even after accounting for additional factors such as anxiety and depression, researchers still discovered differences between IBS patients and control subjects in areas of the brain involved in cognitive and evaluative functions, including the prefrontal and posterior parietal cortices, and in the posterior insula, which represents the primary viscerosensory cortex receiving sensory information from the gastrointestinal tract.

"The grey-matter changes in the posterior insula are particularly interesting since they may play a role in central pain amplification for IBS patients," said study author David A. Seminowicz, Ph.D., of the Alan Edwards Centre for Research on Pain at McGill University. "This particular finding may point to a specific brain difference or abnormality that plays a role in heightening pain signals that reach the brain from the gut."

Decreases in grey matter in IBS patients occurred in several regions involved in attentional brain processes, which decide what the body should pay attention to. The thalamus and midbrain also showed reductions, including a region the periaqueductal grey that plays a major role in suppressing pain.

"Reductions of grey matter in these key areas may demonstrate an inability of the brain to effectively inhibit pain responses," Seminowicz said.

The observed
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Contact: Rachel Champeau
rchampeau@mednet.ucla.edu
310-794-2270
University of California - Los Angeles
Source:Eurekalert  

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