title: Normal ambulatory 24-hour esophageal pH values in Koreans -a multicenter study-.
abstract: Ambulatory 24-hr esophageal pH monitoring is considered the gold standard for diagnosing gastroesophageal reflux disease. The aim of this study was to establish normal values for gastroesophageal acid exposure in healthy Koreans. Fifty healthy volunteers (24 males and 26 females; mean age, 45 yr) without reflux symptoms and without reflux esophagitis or hiatal hernia on upper endoscopy underwent ambulatory 24-hr esophageal pH monitoring after esophageal manometry. The 95th percentiles for the reflux parameters were: the percent total time pH <4, 3.7%; the percent upright time pH <4, 5.7%; the percent supine time pH <4, 1.0%; the number of reflux episodes with pH <4, 76.5; the number of reflux episodes with pH <4 for >5 min, 1.5; the duration of the longest episode, 12.5 min; and the composite score, 14.2. Age and gender were not associated with any of the pH parameters. In conclusion, physiological gastroesophageal reflux occurs in healthy Koreans. These normal esophageal pH values will provide reference data for clinical and research studies in Korea.
authors.affiliation: Department of Internal Medicine, Pusan National University School of Medicine and Medical Research Institute, Pusan National University Hospital, Busan, Korea.
authors.forename: Gwang Ha
authors.initials: GH
authors.lastname: Kim
authors.forename: Kyu Chan
authors.initials: KC
authors.lastname: Huh
authors.forename: Yong Chan
authors.initials: YC
authors.lastname: Lee
authors.forename: Kwang Jae
authors.initials: KJ
authors.lastname: Lee
authors.forename: Suck Chei
authors.initials: SC
authors.lastname: Choi
authors.forename: Ki Nam
authors.initials: KN
authors.lastname: Shim
authors.forename: Jeong Hwan
authors.initials: JH
authors.lastname: Kim
authors.forename: In Seok
authors.initials: IS
authors.lastname: Lee
authors.forename: Hang Lak
authors.initials: HL
authors.lastname: Lee
authors.forename: Hwoon-Yong
authors.initials: HY
authors.lastname: Jung
authors.forename: Hyo Jin
authors.initials: HJ
authors.lastname: Park
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D050782:Esophageal pH Monitoring; D005260:Female; D005745:Gastric Acidity Determination; D005764:Gastroesophageal Reflux / Q000175:diagnosis*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007723:Korea; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D012737:Sex Factors; D013997:Time Factors