An Excised Canine Model of Anterior Glottic Web and Its Acoustic, Aerodynamic, and High-speed Measurements.
Chao Xue, Allyson Pulvermacher, William Calawerts and 2 others
PMID 27671751WHAT IT FOUND
In an excised dog larynx model, adding a suture bridge to mimic a glottic web raised the pressure needed for phonation and increased pitch and signal chaos as the web covered more of the airway.
The web itself vibrated, creating a complex movement system unlike normal voice production.
Key findings
01Phonation threshold pressure and fundamental frequency increased significantly as the simulated glottic web occlusion increased from 0% to 33%.
02Acoustic irregularity, measured by jitter, shimmer, and correlation dimension, was significantly higher in the web model groups compared to baseline.
03High-speed video showed the simulated web mass oscillated during phonation, whereas the anterior commissure in normal tissue remained fixed.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study used excised canine larynges, which lack the neural control, blood flow, and mucosal health of a living human voice box. The model used a silk suture to mimic a fibrous web, which may not perfectly replicate the elasticity or mass of human scar tissue. The study only modeled type 1 webs (up to 33% occlusion), so the results do not apply to more severe stenosis. Perturbation measures (jitter and shimmer) did not increase linearly with occlusion at all pressure levels, suggesting these standard acoustic tools may fail when the signal becomes too chaotic.
The easy way to misread this
Do not interpret these acoustic or aerodynamic values as direct human norms. The study used an excised dog larynx with a suture bridge, so the specific pressure and frequency numbers do not translate directly to clinical assessment of a patient's voice.