The relationship between esophagoscopic findings and total acid reflux time below pH 4 and pH 5 in the upper esophagus in patients with laryngopharyngeal reflux disease (LPRD)

The LPRD patients showed significantly longer acid reflux time in the upper esophagus than the control group. In the LPRD group, the LPRD with RE patients had more frequent acid exposure in the upper esophagus than the LPRD without RE. A pH level of 5 could be appropriate as a cutoff level for the diagnosis of LPRD in upper esophagus pH monitoring.