Objective To investigate the incidence of esophageal bile reflux and its relationship with acid or alkaline reflux and to evaluate the significance of detecting bile reflux in the diagnosis of gastroesophageal reflux disease (GERD). Methods Using ambulatory 24 hour pH monitoring and bilirubin monitoring technique, the changes of 24 hour intraesophageal pH and bile reflux in 34 subjects (including healthy subjects, patients with reflux esophagitis and patients after gastrectomy) were simultaneously asses...