Achalasia is one of the differential diagnoses in patients with symptoms of dysphagia. High-resolution (HR) manometry is now regarded as the diagnostic gold standard for disturbances of esophageal motility. Manometry not only establishes the diagnosis, but also allows the condition to be classified into subtypes that may be important for the subsequent treatment. Three subtypes of achalasia are distinguished in what is known as the Chicago classification ...
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