title: Association between reflux esophagitis and/or hiatus hernia and gastric mucosal atrophy level in Japan.
abstract: OBJECTIVE
  The mechanisms involved in reflux esophagitis (RE) are mainly esophageal motor dysfunction and abnormal esophageal acid exposure. Therefore the extent of gastric mucosal atrophy (GMA), which is related to gastric acid secretion, is an important factor in the development of RE. The aim of this study was to evaluate the prevalence of RE and hiatus hernia (HH) according to level of GMA.
  
  
  METHODS
  A total of 1897 prospective, consecutive endoscopic examinations were performed by the same endoscopist to investigate the prevalence of RE and HH in patients with closed or open-type GMA. The patients were divided into four age groups: under 44, 45-54, 55-64 and over 65 years.
  
  
  RESULTS
  The prevalence of RE and HH in patients with closed-type GMA was significantly higher than that of open-type GMA in the 45-54, 55-64 and over 65 age groups. In patients with open-type GMA, the prevalence of RE in each age group was similar at 5.0-7.4%, and the prevalence of HH in the over 65 age group was significantly higher than that of the 55-64 age group. In patients with closed-type GMA, the prevalence of RE and HH in the over 65 age group was significantly higher than that of other age groups.
  
  
  CONCLUSIONS
  The existence of closed-type GMA and age over 65 years were important factors in the development of RE and HH.
authors.affiliation: Department of Medicine, Division of Gastroenterology, Nippon Medical School, Tokyo, Japan. k-iwa@nms.ac.jp
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Iwakiri
authors.forename: Yuriko
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Hayashi
authors.forename: Makoto
authors.initials: M
authors.lastname: Kotoyori
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Kawami
authors.forename: Akihiko
authors.initials: A
authors.lastname: Kawakami
authors.forename: Choitsu
authors.initials: C
authors.lastname: Sakamoto
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D001284:Atrophy; D004942:Esophagitis, Peptic / Q000150:complications* / Q000453:epidemiology; D004945:Esophagoscopy; D005260:Female; D005753:Gastric Mucosa / Q000473:pathology*; D006551:Hernia, Hiatal / Q000150:complications* / Q000453:epidemiology; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D015995:Prevalence