声門けいれんのメカニズムに関する電気生理学的研究

概要

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Electrophysiological studies on the activity of the internal laryngeal muscles during laryngospasm experimentally induced in the cat were done.Factors causing inspiratory dyspnea during laryngospasm were detected.Conclusions are as follow; 1) Laryngosoasm is organized by spasmic after-discharges seen in adductors, mainly in the thyroarytenoid muscle.Tensor mechanism of the vocal fold including the cricothyroid and the posterior cricoarytenoid, on the contrary, is inhibited, and sphyncteric type of closure is obser.ved. 2) In inspiration during laryngospasm, the posterior cricoarytenoid muscle does not fire at all contrary to cosistent activities of the diaphragmatic muscle. 3) Spasmic after-discharges in the adductors almost disappear in inspiratory phases during laryn.gospasm. 4) inspiratory dyspnea during laryngospasm is not due to spasmic contraction of the adductor muscles, but mainly due to inactivity of the abductor. 5) Aerodynamic effect of inspired air strem plays a cooperative part for dyspneic inspiration of laryngospasm.
社団法人日本耳鼻咽喉科学会の論文