title: Reflux esophagitis patients in Singapore have motor and acid exposure abnormalities similar to patients in the Western hemisphere.
abstract: OBJECTIVE
  Endoscopic esophagitis is less common in the East than in the West. The reason for this is unknown. This study examines prospectively the relationship between endoscopic esophagitis and lower esophageal sphincter pressure, distal esophageal contractility, esophageal peristaltic performance, esophageal acid exposure, gastric acid output, and Helicobacter pylori (H. pylori) status in a consecutive series of Asian patients.
  
  
  METHODS
  Esophageal manometry and ambulatory pH monitoring were carried out in 48 patients with endoscopic esophagitis and 208 patients with symptoms suspicious of gastroesophageal reflux disease but without esophagitis. Gastric acid output and H. pylori serology were determined in 22 of the esophagitis group and 36 of the nonesophagitis group.
  
  
  RESULTS
  Compared to the nonesophagitis patients, esophagitis patients had a higher prevalence of hypotensive lower esophageal sphincter (49% vs 24%, p < 0.001), impaired esophageal contractility (45% vs 22%, p < 0.005), poor peristaltic performance (23% vs 12%, p < 0.05), and pathological acid reflux (48% vs 27%, p < 0.005). However, there was no difference in the two groups with respect to gastric acid output and H. pylori positivity.
  
  
  CONCLUSIONS
  Lower esophageal sphincter competence, esophageal peristaltic contractility, and esophageal acid exposure were important factors in the pathogenesis of reflux esophagitis--results identical to Western studies. Gastric acid output per se and H. pylori infection might not be responsible for susceptibility to esophagitis.
authors.affiliation: Department of Medicine, National University of Singapore, Singapore.
authors.forename: K Y
authors.initials: KY
authors.lastname: Ho
authors.forename: J Y
authors.initials: JY
authors.lastname: Kang
mesh_terms: D000328:Adult; D000368:Aged; D002681:China / Q000208:ethnology; D004942:Esophagitis, Peptic / Q000150:complications / Q000208:ethnology* / Q000503:physiopathology; D004947:Esophagus / Q000378:metabolism / Q000503:physiopathology*; D005260:Female; D005744:Gastric Acid / Q000378:metabolism; D005755:Gastrins / Q000097:blood; D016481:Helicobacter Infections / Q000150:complications; D016480:Helicobacter pylori; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D008365:Manometry; D008875:Middle Aged; D012846:Singapore
chemical_list: D005755:Gastrins