ABSTRACT
Miniaturization of pH electrodes has permitted prolonged esophageal pH monitoring in even the smallest baby.76 Computerized data collection and analysis is now commonplace and this has aided prolonged study periods, which were not previously possible.77 Extensive investigation of affected and otherwise normal infants has facilitated normal and abnormal ranges for esophageal pH to be generated.78 The parameters measured include the number of reflux episodes of a specific pH or less, their duration and the total time for which this occurred as a percentage of the study period.77
The latter appears to be the most important of these as this not only reflects the frequency of reflux but also the esophageal clearance of refluxed acid.
