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Esophageal motor activity and acid clearance
1Department of Medicine, Northwestern University, Chicago, Illinois.
Gastroenterology Clinics of North America
|September 1, 1990
Summary
Patients with reflux disease often have prolonged esophageal acid clearance times due to impaired volume clearance or reduced saliva. This leads to increased acid exposure and a higher risk of peptic esophagitis.
Area of Science:
- Gastroenterology
- Esophageal Physiology
Background:
- Esophageal acid clearance is a two-step process involving volume and acid clearance.
- Normal acid clearance relies on rapid fluid emptying and salivary neutralization of residual acid.
- Prolonged acid clearance times are observed in approximately half of patients with reflux disease.
Purpose of the Study:
- To investigate the mechanisms underlying prolonged esophageal acid clearance times in patients with reflux disease.
- To differentiate between volume clearance and acid clearance abnormalities.
- To understand the role of salivation in esophageal acid neutralization.
Main Methods:
- The study reviews existing evidence on esophageal acid clearance mechanisms.
- It examines factors affecting volume clearance, such as peristalsis and hiatal hernias.
- It analyzes the impact of reduced salivation and salivary neutralizing capacity.
Main Results:
- Prolonged acid clearance is linked to impaired volume clearance (due to esophagitis or hiatal hernia) or reduced salivation.
- Reduced saliva production, seen in smokers and those on anticholinergic drugs, prolongs acid neutralization.
- Increased residual acid in the esophagus leads to prolonged mucosal acid exposure.
Conclusions:
- Abnormalities in either volume clearance or salivation contribute to prolonged esophageal acid clearance.
- This prolonged exposure increases the likelihood of developing peptic esophagitis.
- Understanding these mechanisms is crucial for managing reflux disease.