title: [24-hour esophageal pH monitoring. An analysis of 21 cases].
abstract: Esophageal pH monitoring was carried out with self-made portable pH recorder in 21 subjects for 24 hours under normal conditions. The results were as follows: the number of physiological gastroesophageal reflux (GER, pH < 4) was less than 23 times; the percentage of GER duration calculated by dividing the cumulative time of pH less than 4 by the total monitoring time was less than 1.4; the percentage was about 2 in upright position and less than 0.2 in lying position; the duration of the longest reflux episode was less than 5 minutes; the physiological gastroesophageal reflux occurred more often in upright position; while the pathological GER took place both in upright and lying position. Our study also indicated that the degree of esophagitis had no relation with the type of GER.
authors.affiliation: Department of Internal Medicine, Second Teaching Hospital, Xi'an Medical University.
authors.forename: J
authors.initials: J
authors.lastname: Gong
authors.forename: J Y
authors.initials: JY
authors.lastname: Luo
authors.forename: Y L
authors.initials: YL
authors.lastname: Zu
mesh_terms: D000328:Adult; D004941:Esophagitis / Q000175:diagnosis; D004947:Esophagus / Q000503:physiopathology*; D005260:Female; D005764:Gastroesophageal Reflux / Q000175:diagnosis*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic; D011187:Posture; D013997:Time Factors