What is achalasia? Achalasia is a disorder of the primary motility of the esophagus characterized by the loss of peristalsis and increased tonicity plus failure of the lower esophageal sphincter (LES) relaxation in response to swallowing. Epidemiology It has a worldwide prevalence of 6 to 10 per 100,000 inhabitants per year. Average age of diagnosis … Leer más Achalasia