Vibratory Pattern of the Vocal Cords in Unilateral Laryngeal Paralysis

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Abstract
Cinematographic, roentgenographic and mechanical investigations permit a clarification of the vibratory pattern and the dynamics of phonation in unilateral vocal cord paralysis. The following facts emerge: (1) The paralyzed vocal cord vibrates at the same frequency as the normal cord. (2) The amplitude of the paralyzed cord may be greater or smaller than that of its opposite member. (3) The motions of the cords may be either in phase or out of phase and may differ substantially from cycle to cycle. (4) The healthy cord initiates vibration. (5) The paralyzed vocal cord ceases vibration first. The atypical laryngeal behavior is explained in terms of fundamental anatomic and physiologic principles with reference to structural modifications, air flow characteristics and tissue adjustments. The role of the healthy cord as the regulator of vibration is stressed.