Abstract
Continuous long-term esophageal pH monitoring has become the preferred test to quantify acid gastroesophageal reflux. Because reflux to a limited extent is physiologic, the determination of optimal thresholds to separate normal from abnormal reflux is mandatory. Esophageal pH was measured during 24 hours in 509 healthy thriving infants, aged 3 days to 1 year, using a glass microelectrode with an external reference electrode connected to a portable recorder.
Percentiles of the four parameters studied (reflux index or percent of the investigation time with a pH <4, number of episodes with a pH <4 during 24 hours, number of episodes lasting >5 minutes, the duration of the longest episode (in minutes)) are presented. A percentile curve of the reflux index regarding the age distribution shows that the normal range for the reflux index during the first 12 months of life is about 10% (95 percentile), decreasing from 13% at birth to 8% at 12 months. Application of an age-related percentile curve offers a close-to-reality possibility of data interpretation and illustrates that there is inevitably an overlap of data between normal and abnormal populations, because reflux is a phenomenon occurring to some extent in every human being.
- Received January 17, 1990.
- Accepted May 17, 1990.
- Copyright © 1991 by the American Academy of Pediatrics
Individual Login
Institutional Login
You may be able to gain access using your login credentials for your institution. Contact your librarian or administrator if you do not have a username and password.