Esophageal function testing should be used for differential diagnosis of dysphagia. Dysphagia can be the consequence of hypermotility or hypomotility of the muscles of the esophagus. Decreased esophageal or esophagogastric junction distensibility can provoke dysphagia. The most well established esophageal dysmotility is achalasia. Other motility disorders can also cause dysphagia. High-resolution manometry (HRM) is the gold standard investigation for esophageal motility disorders. Simultaneous measurement of HRM and intraluminal impedance can be useful to assess motility and bolus transit. Impedance planimetry measures distensibility of the esophageal body and gastroesophageal junction in patients with achalasia and eosinophilic esophagitis.
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