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An Experimental Study

Hisayoshi Kojima, MD; Koichi Omori, MD; Kazuhiko Shoji, MD; Iwao Honjo, MD; Nobuhiko Isshiki, MD; Tatsuo Nakamura, MD; Yoshihiko Shimizu, MD

Arch Otolaryngol Head Neck Surg. 1990;116(1):74-78.

Abstract
• In an attempt to remobilize a unilaterally paralyzed vocal cord, experiments were made in five adult dogs. Adduction of the paralyzed vocal cord for phonation in synchrony with the intact cord was achieved by electrical stimulation of the adductor muscles that was triggered by the signals from the cricothyroid muscle. The difference in the level of action potentials of the cricothyroid muscle between during phonation and during respiration was used for setting the threshold so as to differentiate phonation from respiration. Nearly synchronous movement of the two vocal cords thereby attained during phonation greatly improved the voice quality that was hoarse without the paced stimulation.

(Arch Otolaryngol Head Neck Surg. 1990;116:74-78)

Author Affiliations
From the Departments of Otolaryngology (Drs Kojima, Omori, Shoji, and Honjo), Plastic Surgery (Dr Isshiki), and Research Center for Medical Polymers and Biomaterials, School of Medicine (Drs Nakamura and Shimizu), Kyoto (Japan) University.

Footnotes
Accepted for publication May 30, 1989.

Reprint requests to Department of Otolaryngology, School of Medicine, Kyoto University, Sakyo-ku, Kyoto 606, Japan (Dr Kojima).

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