Vagal function in relation to gastro-oesophageal reflux and associated motility changes

Area of Science:

• Gastroenterology
• Neurogastroenterology
• Autonomic Nervous System Function

Background:

• Gastro-oesophageal reflux (GER) is a common condition with multifactorial causes.
• The role of the vagus nerve, a key component of the autonomic nervous system, in GER pathophysiology is not fully understood.

Purpose of the Study:

• To investigate vagal nerve function in patients with GER.
• To determine if impaired vagal function is associated with GER or secondary esophageal spasm.

Main Methods:

• Assessed vagal function via gastric secretory response to insulin-induced hypoglycemia and pulse-rate variation with respiration.
• Performed endoscopic evaluation, mucosal biopsy, and esophageal manometry in patients with GER and duodenal ulcers.

Main Results:

• Seven out of 28 GER patients exhibited impaired upper alimentary vagal efferent function.
• No vagal impairment was observed in GER patients with manometric evidence of esophageal spasm.
• Twelve out of 27 GER patients showed low pulse-rate variation with respiration, indicating cardiac vagal fiber dysfunction.

Conclusions:

• Impaired efferent vagal supply may be a contributing factor in some cases of GER.
• Vagal dysfunction does not appear to play a significant role in esophageal spasm secondary to GER.