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

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Fig. 1. Location of the impedance electrode (A) A catheter for multichannel intraluminal impedance-pH (MII-pH) has impedance electrodes at 3, 5, 7, 9, 15, and 17 cm and pH probe at 5 cm above the upper border of lower esophageal sphincter (LES). (B) A catheter for hypopharyngeal MII (HMII) has 3 pairs of impedance electrodes (hypopharynx, proximal esophagus; 2 cm and 4 cm below upper esophageal sphincter [UES], and distal esophagus; 21 cm and 23 cm below UES). (C) The top impedance electrode in the hypopharynx indicated by arrows was placed 0.5 cm proximal to the upper border of the UES.
J Neurogastroenterol Motil 2022;28:69~77
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