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Dual-sensor esophageal pH monitoring is routinely used to diagnose GERD. However, the proximal sensor may not be in proximal esophagus in patients with shortened esophagi. Our objective was to determine how often the proximal sensor was misplaced and to determine the effect on pH monitoring. Superior margins of the upper and lower esophageal sphincters (UES and LES) were determined prospectively in...
Healthy volunteers without symptoms of either gastroesophageal reflux or laryngopharyngeal reflux and without abnormalities on laryngologic examination were recruited for esophageal pH monitoring. Thirty subjects underwent ambulatory 24-hour double-channel pH probe monitoring to establish normative data for the upper probe, which was positioned just above the upper esophageal sphincter. Data were...
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