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Aerodynamic evaluation of the postthyroidectomy voice.

Nancy Pearl Solomon¹, Leah B Helou, Matthew J Makashay

¹Department of Surgery, Army Audiology and Speech Center, Walter Reed Army Medical Center, Washington, District of Columbia 20307, USA. nancy.p.solomon@us.army.mil

Journal of Voice : Official Journal of the Voice Foundation

|July 26, 2011

Summary

Thyroidectomy did not significantly alter vocal function measures like airway resistance. However, phonation threshold pressure (PTP) decreased post-surgery, possibly due to learning effects or reduced vocal range.

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Area of Science:

Otolaryngology
Speech and Language Pathology
Surgical Outcomes

Background:

Thyroidectomy can impact laryngeal function and voice.
Aerodynamic assessments are used to evaluate vocal function.
Distinguishing surgical effects from intubation effects is important.

Purpose of the Study:

To assess changes in vocal function after thyroidectomy using aerodynamic measures.
To investigate if laryngeal airway resistance (R(law)) and phonation threshold pressure (PTP) change post-thyroidectomy.
To differentiate vocal changes due to thyroidectomy from those caused by endotracheal intubation.

Main Methods:

Prospective longitudinal clinical trial with a control group.
Eighty thyroidectomy patients and 16 control patients were evaluated preoperatively and at 2 weeks and 3 months postoperatively.
Measures included maximum phonation time (MPT), mean airflow, R(law), and PTP at two fundamental frequency (F0) levels.

Main Results:

No systematic differences in MPT, mean airflow, or R(law) were found between surgical and control groups.
Phonation threshold pressure (PTP) significantly decreased over time in both surgical groups and at both F0 levels.
Fundamental frequency (F0) range decreased short-term post-surgery, correlating with PTP changes.

Conclusions:

Aerodynamic assessments did not show systematic vocal function changes directly linked to thyroidectomy.
A postoperative decrease in PTP was observed in surgical patients, potentially due to learning effects or reduced F0 range.
Further research may be needed to fully understand the long-term vocal impact of thyroidectomy.