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. 2023 Mar 16;15(3):84–102. doi: 10.4253/wjge.v15.i3.84

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©The Author(s) 2023. Published by Baishideng Publishing Group Inc. All rights reserved.

This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial.

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Tracing from MII-pH study and correct position of MII-pH probe on chest radiography. A: Acid reflux (impedance changes up to 7.5 cm above the pH sensor, which shows a drop in pH); B: Non-acid reflux (impedance changes up to 9 cm above the pH sensor, without a pH drop); C: Swallow shown by impedance changes; D: Chest X-ray showing proper position of the pH sensor (arrow) of the MII-pH probe 2 vertebral bodies above the diaphragm (dotted line).