Hypersensitivity for capsaicin in patients with functional dyspepsia

Area of Science:

• Gastroenterology
• Clinical Medicine
• Pharmacology

Background:

• Functional dyspepsia (FD) pathophysiology remains unclear, limiting diagnostic and therapeutic strategies.
• A subgroup of FD patients may exhibit heightened sensitivity to chemical stimuli.
• Identifying such hypersensitivity could refine diagnosis and treatment approaches.

Purpose of the Study:

• To evaluate the efficacy of an oral capsaicin load test for detecting chemical hypersensitivity in functional dyspepsia.
• To establish the reliability and diagnostic value of the capsaicin test in FD patients.

Main Methods:

• A dose-finding study preceded the main trial.
• 61 healthy controls and 54 FD patients ingested a 0.75 mg capsaicin capsule.
• Symptom severity was assessed using a graded questionnaire, with an aggregate symptom score calculated.

Main Results:

• FD patients exhibited significantly higher symptom scores compared to controls (10.0 vs. 6.0).
• The capsaicin test identified chemical hypersensitivity in 54% of FD patients.
• The test demonstrated good reliability (Cronbach's alpha = 0.86).

Conclusions:

• The capsaicin load test is a simple, non-invasive tool for identifying chemical hypersensitivity in functional dyspepsia.
• This test can help diagnose a specific subgroup of FD patients.
• Findings suggest a role for chemical hypersensitivity in FD pathophysiology.