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Aerodynamic Threshold Measures for Reflecting Glottal Closure in Voice Disorders
Roger W Chan1, Sally Chien Hsin Liu2, Li-Chun Hsieh2,3
1Geriatric Care Research Center, Xiamen Medical College, Xiamen, Fujian, China.
Journal of Speech, Language, and Hearing Research : JSLHR
|November 18, 2024
Summary
Phonation threshold power (PTW) effectively identifies glottal incompetence, particularly in hypofunctional voice disorders. PTW shows higher sensitivity than phonation threshold pressure (PTP) and phonation threshold flow (PTF) in quantifying incomplete glottal closure.
Area of Science:
- Laryngology and Voice Science
- Speech Pathology and Acoustics
Background:
- Aerodynamic measures like phonation threshold pressure (PTP), phonation threshold flow (PTF), and phonation threshold power (PTW) have been proposed for quantifying glottal incompetence.
- Understanding the relationship between these aerodynamic measures and the degree of incomplete glottal closure is crucial for diagnosing and managing voice disorders.
Purpose of the Study:
- To investigate the effectiveness of PTP, PTF, and PTW in reflecting varying degrees of incomplete glottal closure in individuals with voice disorders.
- To compare the diagnostic accuracy of these aerodynamic measures in differentiating between different types of glottal incompetence.
Main Methods:
- Thirty individuals with glottal incompetence (10 hypofunctional, 20 hyperfunctional) and 30 controls participated.
- PTP, PTF, and PTW were measured, with PTW calculated as PTP × PTF.
- Incomplete glottal closure was quantified using normalized glottal gap (NGG) and normalized glottal gap area (NGGA) from videostroboscopic analysis.
Main Results:
- Significant differences in PTP, PTF, and PTW were observed across the three groups (hypofunctional, hyperfunctional, control), with higher values in the hypofunctional group.
- Receiver operating characteristic (ROC) analysis indicated good classification accuracy, particularly for PTW, in distinguishing hypofunctional from control groups (area under curve = .717–.757).
- Strong positive correlations were found between aerodynamic measures (especially PTW) and glottal gap parameters (NGG, NGGA) in the hypofunctional and overall disorders groups.
Conclusions:
- Aerodynamic measures, particularly PTW, are effective in identifying glottal incompetence, especially in hypofunctional voice disorders.
- PTW demonstrated higher sensitivity than PTP and PTF in quantifying incomplete glottal closure, aligning with theoretical expectations.
- Further research is recommended to evaluate the specific sensitivities of these measures for distinct incomplete glottal closures associated with various voice disorders.
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