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The procedure to fix it involves a doctor injecting 50 to 100 units of Botox — more than twice the amount often used to smooth forehead wrinkles — into the upper cricopharyngeal muscle.

R-CPD, also known as "no burp syndrome", occurs when the cricopharyngeal muscle in the throat is unbale to relax to allow gas to pass upwards.

This is the spasmodically closed cricopharyngeal constriction.

Passing the cricopharyngeal and hiatal spasmodically contracted narrowings will prove the most trying part of esophagoscopy; but with the head properly held, and the tube properly placed and directed, patient waiting for relaxation of the spasm with gentle continuous pressure will usually expose the lumen ahead.

The larynx is to be exposed as in direct laryngoscopy, the right pyriform sinus identified, the tip of the speculum inserted therein, and gently insinuated to the cricopharyngeal constriction.