REPRODUCIBILITY OF CONTINUOUS 24 HOUR ESOPHAGEAL PH MONITORING IN INFANTS AND CHILDREN

The reproducibility of 24 hour oesophageal pH monitoring was studied in 30 infants and children including the proportions of the investigation time with a pH <4 (reflux index), the number of episodes with a pH <4 or lasting longer than five minutes, and the duration of the longest episode with a pH <4. Twenty four hour pH monitoring was performed using identical equipment on two consecutive days under similar conditions. Pearson correlation coefficients range from 0.88 to 0.98. The results obtained on two consecutive days were similar. The reflux index and the number of reflux episodes >five minutes were the most reproducible parameters. Despite the many patient factors influencing pH data, the reproducibility of 24 hour pH monitoring data are satisfactory for routine clinical application.