Acid hypersensitivity in patients with eosinophilic oesophagitis

Area of Science:

• Gastroenterology
• Oesophageal Physiology
• Pain Research

Background:

• Eosinophilic oesophagitis (EoE) is frequently associated with painful symptoms.
• Limited experimental data exist regarding pain mechanisms in EoE.
• Understanding pain response is crucial for managing EoE symptoms.

Purpose of the Study:

• To compare oesophageal pain responses to mechanical, thermal, and electrical stimuli in EoE patients and healthy controls.
• To investigate the role of acid perfusion in eliciting pain in EoE.
• To assess for central nervous system sensitization in EoE.

Main Methods:

• Utilized a multimodal oesophageal probe for stimulation.
• Administered mechanical, thermal, electrical, and acid (0.1 M HCl) stimuli.
• Recorded pain scores, referred pain areas, and evoked brain potentials.

Main Results:

• EoE patients showed significantly lower acid tolerance and earlier onset of acid-induced burning sensation compared to controls.
• Patients with pure EoE experienced acid-induced burning earlier than those with coexisting gastro-oesophageal reflux disease or controls.
• No significant differences were observed in responses to mechanical, thermal, or electrical stimuli, indicating no central sensitization.

Conclusions:

• EoE patients demonstrate hypersensitivity to oesophageal acid, likely due to peripheral mechanisms.
• Findings suggest that physiological acid reflux may contribute to symptom generation in EoE.
• Pain pathophysiology in EoE appears localized to the oesophageal tissue.