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. 2023 Oct 30;29(4):419–427. doi: 10.5056/jnm23125

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© 2023 The Korean Society of Neurogastroenterology and Motility

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Hierarchical classification for esophageal motility disorders according to Chicago classification version 4.0. According to the latest version of the Chicago classification, motility disorders can be classified into 2 main subcategories based on the manometric parameter, expressing the relaxation of the esophago-gastric junction, the integrated relaxation pressure. If raised, patients are categorized into the disorders of the esophagogastric junction (EGJ) outflow, comprising achalasia and EGJ outflow obstruction.