Long-term changes in vocal quality following Isshiki thyroplasty type I

Area of Science:

• Otolaryngology
• Speech-Language Pathology
• Vocal Fold Dynamics

Background:

• Unilateral vocal fold paralysis significantly impacts vocal quality and function.
• Surgical interventions aim to restore vocal fold function through medialization.

Purpose of the Study:

• To evaluate the long-term effects of Isshiki thyroplasty type I on vocal quality in patients with unilateral vocal fold paralysis.
• To assess changes in fundamental frequency, vocal intensity, maximum phonation time, and breath groups post-surgery.

Main Methods:

• A longitudinal study was conducted on five subjects with unilateral vocal fold paralysis.
• Vocal parameters were assessed pre- and post-thyroplasty type I (up to 4 years 4 months).
• Thyroplasty type I involved using a Silastic implant for vocal fold medialization.

Main Results:

• Significant long-term improvements were observed in vocal fundamental frequency and maximum phonation time.
• Habitual vocal intensity was significantly moderated post-surgery.
• A reduction in breath groups was noted within the thyroplasty group post-surgery compared to pre-surgery.

Conclusions:

• Isshiki thyroplasty type I offers long-term positive changes in vocal parameters for patients with unilateral vocal fold paralysis.
• Vocal fold medialization is attributed to the observed improvements in voice quality and function.
• The procedure demonstrated a favorable safety profile with no noted complications.