Effects of thyroplasty type I on vocal fold vibration

Area of Science:

• Otolaryngology
• Speech and Language Pathology
• Vocal Fold Dynamics

Background:

• Glottic incompetence dysphonia results from incomplete vocal fold closure.
• Medialization thyroplasty aims to improve glottic closure and voice quality.

Purpose of the Study:

• To evaluate the impact of medialization thyroplasty on vocal fold vibration in patients with glottic incompetence dysphonia.

Main Methods:

• 20 patients underwent Isshiki's thyroplasty type I for glottic incompetence dysphonia.
• Quantitative videostroboscopy measured glottic area, width, posterior gap, and vibration amplitude.
• Vocal function was assessed using acoustic, aerodynamic, and perceptual measures.

Main Results:

• Thyroplasty type I reduced glottal area and width, with improved glottic closure in most patients.
• Vocal fold vibration amplitude and closed phase duration increased post-surgery.
• Surgical outcomes correlated with improved vocal function measures.

Conclusions:

• Medialization thyroplasty effectively reduces glottal gaps and enhances vocal fold vibration.
• The procedure improves phonation efficiency in patients suffering from glottic incompetence dysphonia.