The value of ambulatory 24 hr esophageal pH monitoring in clinical practice in patients who were referred with persistent gastroesophageal reflux disease (GERD)-related symptoms while on standard dose anti-reflux medications.

To determine the value of pH testing in clinical practice in gastroesophageal reflux disease patients who failed anti-reflux treatment. Patients resistant to standard dose proton pump inhibitor or an H2-blocker underwent pH testing. Randomly selected patients from the proton pump inhibitor failure group underwent the modified acid perfusion test as compared to patients with non-erosive reflux disease.

Relationship between rate of change in acid exposure along the esophagus and length of Barrett's epithelium.

Objective: Gastroesophageal reflux disease (GERD) plays a major role in the development of Barrett's esophagus. Recently, we demonstrated that duration of esophageal acid exposure in the distal esophagus correlates with the length of Barrett's mucosa. The aim of this study was to determine whether there is a relationship between the rate of the change in acid exposure along the esophagus and the length of Barrett's esophagus.