Cineradiography of the pharyngeal stage of deglutition in 150 individuals without dysphagia

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Abstract
With the aid of cineradiography the pharyngeal stage of deglutition was examined at a speed of 50 and 100 frames/s among 150 individuals without dysphagia. In 124 (83%) the act of swallowing had a symmetrical and synchronous pattern. Different types of aberrations from this pattern were registered in 26 individuals (17%). In 7 individuals the epiglottis did not tilt down properly but remained in a transverse position during deglutition. In 8 individuals, contrast medium passed into the laryngeal vestibule. Seven individuals had a dysfunction of the cricopharyngeal muscle which did not relax properly. One individual had a web in the upper esophagus. In all but 2 individuals the aberrations were isolated and not concomitant with other abnormalities of the act of swallowing.