Functional Test of the Larynx by the Superimposing Method of Laryngograms

Abstract

Both laryngograms during phonation and inspiration illustrate the same figure at the portion of the trachea. When both laryngeal figures are superimposed at the tracheal portion, movement of the vocal fold is to be quantitatively measured in two dimensions, horizontally and vertically. This method was applicated to cases of the recurrent laryngeal nerve paralysis and the laryngeal carcinoma. In the former, it was clarified that the paralysed vocal fold slightly adducts during phonation especially in all cases it shows no atrophy. In the latter, the invasion of carcinoma into the vocal muscle was more exactly diagnosed by the extent of adduction of the diseased vocal fold.