title: Acid exposure and altered acid clearance in GERD patients treated for Helicobacter pylori infection.
abstract: BACKGROUND
  After the eradication of Helicobacter pylori, an increased incidence of gastroesophageal reflux disease and acid gastric secretion have been reported.
  
  
  OBJECTIVE
  To evaluate the effect of Helicobacter pylori-eradication on proximal and distal gastroesophageal reflux and acid clearance in patients with gastroesophageal reflux disease.
  
  
  METHODS
  Sixty-eight gastroesophageal reflux disease patients (age range 18-61 years) were studied by upper endoscopy. All underwent esophageal manometry and dual probe 24-h pH-metry.
  
  
  RESULTS
  Percent of time at pH<4 was significantly increased in the proximal esophagus of Helicobacter pylori-eradicated patients compared to Helicobacter pylori-negative (2.4+/-0.5 vs. 1.0+/-0.2; p<0.01); no differences were found in the distal esophagus (14.0+/-3.7 vs. 9.0+/-1.4%, NS). The total number of reflux episodes was significantly higher in the proximal oesophagus of Helicobacter pylori-eradicated patients (37+/-3 vs. 22+/-3, p<0.05). In the distal esophagus, acid clearance was significantly longer, both during total time (1.4+/-0.2 vs. 0.8+/-0.7 min, p<0.01), and in the supine period (8.5+/-2.7 vs. 2.7+/-0.4 min, p<0.05). No differences were reported in the manometric parameters of the two groups of patients.
  
  
  CONCLUSIONS
  In patients with gastroesophageal reflux disease, Helicobacter pylori eradication is associated with increased acid exposure of the proximal esophagus and delayed distal acid clearance.
authors.affiliation: Department of Clinical and Experimental Medicine, Division of Hepatogastroenterology, University Federico II, Via Sergio Pansini 5, 80131 Naples, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Sarnelli
authors.forename: E
authors.initials: E
authors.lastname: Ierardi
authors.forename: R
authors.initials: R
authors.lastname: Grasso
authors.forename: C
authors.initials: C
authors.lastname: Verde
authors.forename: M E
authors.initials: ME
authors.lastname: Bottiglieri
authors.forename: G
authors.initials: G
authors.lastname: Nardone
authors.forename: G
authors.initials: G
authors.lastname: Budillon
authors.forename: R
authors.initials: R
authors.lastname: Cuomo
mesh_terms: D000293:Adolescent; D000328:Adult; D000658:Amoxicillin / Q000627:therapeutic use; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D000897:Anti-Ulcer Agents / Q000627:therapeutic use; D017291:Clarithromycin / Q000627:therapeutic use; D004359:Drug Therapy, Combination; D016099:Endoscopy, Gastrointestinal; D004947:Esophagus / Q000473:pathology; D005260:Female; D005744:Gastric Acid / Q000378:metabolism*; D005764:Gastroesophageal Reflux / Q000150:complications / Q000378:metabolism* / Q000382:microbiology; D016481:Helicobacter Infections / Q000150:complications / Q000188:drug therapy / Q000378:metabolism*; D016480:Helicobacter pylori; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D008365:Manometry; D008875:Middle Aged; D008991:Monitoring, Physiologic; D015999:Multivariate Analysis; D009853:Omeprazole / Q000627:therapeutic use; D010406:Penicillins / Q000627:therapeutic use
chemical_list: D000900:Anti-Bacterial Agents; D000897:Anti-Ulcer Agents; D010406:Penicillins; D000658:Amoxicillin; D017291:Clarithromycin; D009853:Omeprazole