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Changes in Cough Airflow and Acoustics After Injection Laryngoplasty.
Anaïs Rameau1, Katerina Andreadis1, Alexander German1
1Department of Otolaryngology-Head and Neck Surgery, Weill Cornell Medicine, Sean Parker Institute for the Voice, New York, New York, U.S.A.
The Laryngoscope
|June 20, 2022
Summary
Injection laryngoplasty improves cough effectiveness in patients with glottic insufficiency. This procedure enhances cough airflow dynamics, which can be monitored using cough acoustic signals, potentially reducing aspiration risk.
Area of Science:
- Otolaryngology
- Speech and Language Pathology
- Pulmonology
Background:
- Glottic insufficiency, often due to vocal fold dysfunction, impairs voluntary cough effectiveness.
- Effective cough is crucial for airway clearance and preventing aspiration.
Purpose of the Study:
- To investigate if injection laryngoplasty improves cough airflow dynamics in patients with glottic insufficiency.
- To determine if cough strength can be inferred from acoustic signals.
- To assess the correlation between glottic competence, cough sounds, and spectrogram morphology.
Main Methods:
- A prospective interventional study involving patients scheduled for injection laryngoplasty.
- Instrumental assessment of voluntary cough airflow using a pneumotachometer and cough sound recording.
- Statistical analysis (Wilcoxon signed-rank test, Spearman correlation) to compare pre- and post-procedure measures.
Main Results:
- Injection laryngoplasty significantly decreased peak expiratory flow rise time and increased cough volume acceleration, indicating improved cough effectiveness.
- A weak but significant correlation was found between peak expiratory flow rise time and acoustic measures (acoustic energy, peak power density).
Conclusions:
- Injection laryngoplasty may improve cough effectiveness in patients with glottic insufficiency, potentially averting aspiration.
- Cough airflow improvements following the procedure can be tracked using cough acoustic signals.
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