An experimental study about relaxation and contraction of the cricopharyngeus muscle under general anesthesia in a total laryngectomy

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  • 嚥下第2期における輪状咽頭筋の弛緩と収縮に関する一考察

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Abstract

An experimental study focusing on relaxation and contraction of the cricopharyngeus muscle as monitored by E. M. G., and intraluminal pressure recordings in a total laryngectomy under general anesthesia, was done. Furthermore, freshly extracted canine inferior constrictor muscles were used for the purpose of assurance of cause of variety on phonation and/or swallowing regarding bursts of action potential and/ or abrupt pressure changes. After swallowing, an appearance of intraluminar positive pressure is suppressed by suxamethonium chloride, but a transient negative pressure in consequence of the passage of bolus, which is among tonic consecutive bursts at rest. Similar phenomenon are assured by an experimental use of mechanogram and highly concentrated potassium contracture. The variety of muscle contraction of the cricopharyngeus was attested by an immunohistochemical staining method utilizing PAP (peroxidase anti-peroxidase).

Journal

  • OTOLOGIA FUKUOKA

    OTOLOGIA FUKUOKA 36 (5Supplement5), 949-956, 1990

    JIBI TO RINSHO KAI

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