Electromyographic Study on Respiratory Movement of the Intrinsic Laryngeal Muscles:-Effect of Anesthesia-

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Although it is known that electrical activity in five intrinsic laryngeal muscles during respiration is controlled by respiratory center, the effects of anesthesia to laryngeal muscles has not yet been elucidated.The present author attempted to make a research on respiratory movement of the larynx in time of anesthesia, observing electromyograms of the intrinsic laryngeal muscles of matured rabbits.The results were as follows.:According to progress of anesthesia, discharge of the laryngeal muscles showed variable electromyographic pattern in contrast with normal condition.The discharge-frequency of anticus was decreased especially during inspiration, while that of posticus was increased during expiration as well as inspiration.In view of above findings, it is showed that posticus are more resistant to anesthesia than anticus.In other words, inspiratory muscles of larynx are more resistant to paralysis than expiratory muscles as well as other respiratory muscles.
耳鼻咽喉科臨床学会の論文