Abstract
The diagnosis of functional esophageal disorders has evolved from conventional manometry in 1970s to high-resolution manometry in 2010s. The conventional manometry was based on linear plot, whereas newly developed high-resolution manometry is based on spatiotemporal plots. Additionally, novel parameters including integrated relaxation pressure, distal contractile integral, and distal latency have expanded our understanding of pathophysiology of functional esophageal disorders including esophageal achalasia. Following three rounds of revision, the fourth version of Chicago classification of esophageal motility disorders was developed, which is more closely related to clinical situations compared with the previous versions. Moreover, functional lumen imaging probe (FLIP), based on the distensibility of esophageal lumen and sphincter, has also strengthened our understanding of functional esophageal disorders.
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