title: Complete elimination of reflux symptoms does not guarantee normalization of intraesophageal and intragastric pH in patients with gastroesophageal reflux disease (GERD).
abstract: BACKGROUND
  Acid plays a significant role in the development of gastroesophageal reflux symptoms, such as heartburn and regurgitation. It is generally assumed that acid suppressive therapy improves or eliminates symptoms by normalizing intraesophageal pH.
  
  
  OBJECTIVE
  The aim of this article was to assess the efficacy of proton-pump inhibitors (PPIs) in normalizing intraesophageal and intragastric pH in patients with GERD without Barrett's esophagus (BE) rendered symptom free by therapy.
  
  
  METHODS
  Patients were evaluated by dual-sensor 24-h pH monitoring while receiving PPI therapy for complete control of GERD symptoms. Analyses of intraesophageal and intragastric pH profiles were then made.
  
  
  RESULTS
  Fifty patients, 39 men and 11 women, with GERD, without BE, were studied. All tolerated PPIs well and were asymptomatic at the time of the study. Fifty percent of patients had abnormal intraesophageal pH profiles despite adequate symptom control on PPIs, which was associated with significant breakthrough of intraesophageal acid control in both the upright and supine positions. Low intragastric pH correlated highly with intraesophageal acid reflux only in patients with persistent abnormal esophageal acid exposure (p= 0.001).
  
  
  CONCLUSIONS
  Fifty percent of patients with GERD without BE continue to exhibit pathologic GERD and low intragastric pH despite PPI therapy that achieves complete reflux symptom control.
authors.affiliation: Department of Medicine; Section of Gastroenterology, VA Palo Alto Health Care System, Palo Alto, California 94304, USA.
authors.forename: David
authors.initials: D
authors.lastname: Milkes
authors.forename: Lauren B
authors.initials: LB
authors.lastname: Gerson
authors.forename: George
authors.initials: G
authors.lastname: Triadafilopoulos
mesh_terms: D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D005745:Gastric Acidity Determination; D005764:Gastroesophageal Reflux / Q000175:diagnosis* / Q000188:drug therapy*; D049670:History, 17th Century; D006801:Humans; D006863:Hydrogen-Ion Concentration; D016014:Linear Models; D008297:Male; D008991:Monitoring, Physiologic; D011336:Probability; D011446:Prospective Studies; D054328:Proton Pump Inhibitors; D017494:Proton Pumps / Q000627:therapeutic use; D012307:Risk Factors; D012720:Severity of Illness Index; D016896:Treatment Outcome
chemical_list: D054328:Proton Pump Inhibitors; D017494:Proton Pumps