Graphic representation of pharyngeal wall motion during swallow: technical note.

Movements of the pharyngeal wall were measured at 12 transverse levels, on consecutive cineradiograms obtained during swallowing of thin, liquid barium, in a single nondysphagic volunteer. By graphic representation of these measurements on the IBM personal computer, it was possible to analyze in detail pharyngeal motor activity in terms of displacement of the pharyngeal wall. The contraction created a fairly steep narrowing of the lumen. The peristaltic wave was more difficult to analyze. Movements of the pharyngeal wall in posteroanterior projection gave good information about the constrictors. Although this technique has several inherent methodologic difficulties, its use may expand our knowledge of pharyngeal peristalsis.