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Esophageal manometry has been widely used to diagnose esophageal motility disorders. 1 It is the standard diagnostic tool in nonobstructive dysphagia, as it evaluates both pressures of the lower esophageal sphincter (LES) and contractility of the esophageal body. An important advancement in the last 20 years has been the introduction of high-resolution manometry (HRM), usually defined as manometry carried out with a catheter with at least 21 channels and with sensors at 1-cm intervals. 2 HRM is swiftly replacing conventional manometry, in which only a limited number of sensors (usually 4 to 8) are used. The generally perceived advantages of HRM over conventional manometry are that positioning of the catheter is less critical and that the interpretation of the recorded pressures, displayed in the form of topographical color-coded plots, is more intuitive. 3

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