Why can cricopharyngeal dysfunction present with both dysphagia and regurgitation?

• A. Impaired relaxation of the upper esophageal sphincter leads to stasis and regurgitation of swallowed material into pharynx or airway.
• B. Esophageal spasm unrelated to the upper sphincter.
• C. Gastric reflux causing esophagitis without pharyngeal involvement.
• D. Tracheoesophageal fistula formation.

Answer: (A)

When the upper esophageal sphincter (cricopharyngeus) fails to relax at the right moment, the passage from the pharynx into the esophagus stays closed. That means a swallowed bolus can’t move forward, leading to dysphagia. The material that can’t pass collects just above the sphincter, creating stasis. That same reservoir can be pushed backward into the pharynx, causing regurgitation into the throat or even toward the airway. So cricopharyngeal dysfunction explains both the trouble swallowing and the regurgitation as a consequence of a single impaired barrier at the pharyngoesophageal junction. Other options describe processes that don’t link dysphagia with regurgitation from the UES: esophageal spasm involves the body of the esophagus and less commonly regurgitation from above the sphincter; gastric reflux affects the stomach/esophagus below the sphincter and doesn’t produce regurgitation from the pharyngeal area; a tracheoesophageal fistula causes coughing and aspiration from an abnormal connection rather than a failure of the UES to relax.