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Ischemic hypersensitivity in irritable bowel syndrome patients
Qiqi Zhou1, Roger B Fillingim, Joseph L Riley
1Department of Medicine, The Ohio State University, Columbus, Ohio 43212, USA.
Pain Medicine (Malden, Mass.)
|October 30, 2010
Summary
Irritable bowel syndrome (IBS) patients exhibit heightened sensitivity to deep pain stimuli, indicating altered central pain processing. This hypersensitivity to ischemic pain correlates with the severity of their gastrointestinal symptoms.
Area of Science:
- Gastroenterology
- Pain Medicine
- Neuroscience
Background:
- Evidence is mixed on whether irritable bowel syndrome (IBS) patients experience heightened somatic pain perception.
- Investigating pain perception in IBS is crucial for understanding the condition's complex pathophysiology.
Purpose of the Study:
- To evaluate somatic hypersensitivity in IBS patients using a deep, tonic somatic pain stimulus (ischemic pain).
- To compare pain perception between IBS patients and healthy controls.
Main Methods:
- 27 diarrhea-predominant IBS, 15 constipation-predominant IBS patients, and 29 controls underwent ischemic arm pain induction via a modified submaximal effort tourniquet procedure.
- Pain threshold and tolerance times were recorded; participants also completed the Functional Bowel Disease Severity Index (FBDSI) and psychosocial questionnaires.
- Group differences were analyzed using one-way ANOVA and Tukey comparisons.
Main Results:
- IBS patients demonstrated significantly shorter times to ischemic pain threshold and tolerance compared to controls.
- No significant difference was found in pain ratings at the time of tolerance between groups.
- IBS patients reported higher FBDSI scores, and a negative correlation was observed between ischemic pain threshold and FBDSI score.
Conclusions:
- IBS patients exhibit hypersensitivity to ischemic arm pain, suggesting widespread alterations in central pain processing.
- The association between ischemic pain threshold and clinical symptoms may indicate a dysfunction in inhibitory pain systems in IBS.
- These findings highlight potential central pain mechanisms contributing to IBS symptomology.
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