The relevance of stroboscopy in functional dysphonias(1)

Area of Science:

• Laryngology
• Speech-Language Pathology
• Voice Science

Background:

• Functional dysphonias involve voice disturbances without structural abnormalities.
• Current clinical practice often subcategorizes these disorders into hyperfunctional and hypofunctional types.
• The diagnostic and classificatory utility of videostroboscopy for these subcategories requires critical evaluation.

Purpose of the Study:

• To critically evaluate the relevance of videostroboscopy in the diagnosis and classification of functional dysphonias.
• To assess if videostroboscopy can differentiate between hyperfunctional and hypofunctional voice disorders.
• To determine the correlation between quantitative stroboscopic parameters and subjective assessments.

Main Methods:

• Videostroboscopy was performed on 45 patients with functional dysphonias (27 hyperfunctional, 15 hypofunctional, 3 mixed).
• Quantitative analysis included three geometrical and three time-dependent stroboscopic parameters.
• Cluster analysis was employed to identify potential subgroups based on stroboscopic findings.

Main Results:

• The study could not confirm the clinical subdivision of functional dysphonias into hyper- and hypofunctional types using videostroboscopy.
• Quantitative stroboscopic measurements did not correlate with qualitative subjective assessments.
• Separate clusters of stroboscopic findings corresponding to the proposed subclassification were not identified.

Conclusions:

• Videostroboscopy remains a valuable tool for excluding organic lesions in functional dysphonia diagnostics.
• The current study did not find videostroboscopy reliable for subclassifying functional dysphonias into hyper- and hypofunctional types.
• Further research may be needed to refine diagnostic criteria for functional voice disorders.