Abstract
Dysphagia is common in the general population. Many patients with dysphagia have normal endoscopy, barium swallow, and esophageal manometry findings. Rome classification classifies these patients into the category of functional dysphagia (FD).1 Each swallow induces a wave of esophageal inhibition/distension followed by contraction, both of which travel from the top to the bottom of the esophagus in a sequential or peristaltic fashion.2,3 High-resolution esophageal manometry (HRM) and the Chicago classification assess only the contraction phase of peristalsis.
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