Journal of Neurogastroenterology and Motility : eISSN 2093-0887 / pISSN 2093-0879

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Fig. 1. Configuration of the hypopharyngeal multichannel intraluminal impedance-pH catheter for detection of pharyngeal acid reflux. The catheter was selected based on the participants’ esophageal length. The catheter incorporates 2 trans-upper esophageal sphincter (UES) impedance channels to differentiate refluxes from swallows, 2 proximal esophageal ones, and 2 distal esophageal ones. The 2 pH probes were located at 1 cm above the UES and 5 cm (± 1 cm) above the lower esophageal sphincter (LES).
J Neurogastroenterol Motil 2023;29:49~57
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