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An observational study of cognitive function in patients with irritable bowel syndrome and inflammatory bowel disease
J W Berrill1, J Gallacher, K Hood
1Department of Gastroenterology, University Hospital Llandough, Cardiff, UK.
Insights
Cognitive impairment is not intrinsically linked to Irritable Bowel Syndrome (IBS) or Inflammatory Bowel Disease (IBD). Mood disorders, particularly depression, may influence cognitive performance in these patients.
Area of Science:
- Gastroenterology
- Neuropsychology
- Psychiatry
Background:
- Irritable Bowel Syndrome (IBS) and Inflammatory Bowel Disease (IBD) share risk factors for cognitive impairment, including cytokine changes, mood disorders, and chronic pain.
- Previous research suggests a link between these gastrointestinal conditions and cognitive decline.
- This study investigated the cognitive profiles of patients diagnosed with IBS and IBD.
Purpose of the Study:
- To explore the cognitive function in patients with Irritable Bowel Syndrome (IBS) and Inflammatory Bowel Disease (IBD).
- To determine if IBS or IBD have an intrinsic association with cognitive dysfunction.
- To assess the impact of mood disorders and disease severity on cognition in IBS and IBD patients.
Main Methods:
- 231 participants (150 IBD, 40 IBS, 41 controls) completed the Cardiff Cognitive Battery, assessing psychomotor speed, memory, and intelligence.
- Analysis of covariance controlled for demographic factors, anxiety, and depression.
- Fecal calprotectin measured disease activity in IBD patients.
Main Results:
- IBD patients initially showed lower fluid and crystalline intelligence scores compared to controls.
- After accounting for mood disorders and education, no significant cognitive differences were found between IBD patients and controls.
- Disease duration, activity, and symptom severity did not impact cognitive function in either IBS or IBD patients.
Conclusions:
- The study does not support an intrinsic disease process in IBS or IBD causing cognitive dysfunction.
- Concurrent mood disorders, especially depression, may affect specific cognitive tasks in patients with IBD.
- Cognitive performance in IBS and IBD patients appears more influenced by comorbid conditions than the diseases themselves.
Background:
Irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD) are associated with several risk factors for developing cognitive impairment. These include altered cytokine levels, concurrent mood disorders, and the presence of chronic pain. This observational study aimed to explore the cognitive profile of patients with these conditions.
Methods:
Participants completed the Cardiff Cognitive Battery, a series of computerized neuropsychological performance tests that examine a range of cognitive function including psychomotor speed, memory, and intelligence. A progressive analysis of covariance model was used with demographic details, anxiety and depression scores entered as covariates. Fecal calprotectin levels were measured in IBD patients to determine disease activity.
Key Results:
In total 231 participants were recruited (150 IBD patients, 40 IBS patients, and 41 healthy controls). IBD patients had significantly lower scores on fluid (p = 0.01) and crystalline intelligence tests (p = 0.028) compared to healthy volunteers, however, this reflected differences in concurrent mood disorder and level of education. When these factors were added as covariates, there was no significant difference between the groups. Duration and activity of disease did not affect cognitive function in IBD patients. Severity of symptoms had no impact on cognition in patients with IBS.
Conclusions & Inferences:
The results of this observational study do not support the hypothesis that IBS or IBD have an intrinsic disease process that is associated with cognitive dysfunction. It is possible that concurrent mood disorders, in particular depression, may affect the cognitive performance of patients with IBD in specific tasks.
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