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Quantification of static and dynamic supraglottic activity.

S V Stager1, S Bielamowicz, A Gupta

  • 1Voice Treatment Center, The George Washington University, Washington, DC, USA. sursvs@gwumc.edu

Journal of Speech, Language, and Hearing Research : JSLHR
|January 5, 2002
PubMed
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Quantifying static supraglottic compression offers a new diagnostic method for voice disorders. Dynamic false vocal fold motion appears to be an articulatory function, not indicative of laryngeal dysfunction.

Area of Science:

  • Laryngology
  • Speech-Language Pathology
  • Voice Science

Background:

  • Current methods for assessing supraglottic compression in voice disorders rely on subjective rating scales.
  • Objective quantification of supraglottic activity is needed for better differentiation between voice-disordered groups.

Purpose of the Study:

  • To develop and validate a method for quantifying static supraglottic activity.
  • To quantify the extent of false vocal fold (FVF) motion during dynamic supraglottic activity.
  • To investigate differences in supraglottic compression between individuals with and without voice disorders.

Main Methods:

  • Transnasal fiberoptic laryngeal examinations were conducted during various speech tasks.
  • Single-frame images captured minimum and maximum supraglottic compression.

Related Experiment Videos

  • Measurements included anterior-to-posterior (A-P) distance, vocal fold length, and area to derive compression metrics.
  • Inter-rater reliability was established for both subjective ratings and objective measures.

    • Main Results:

    • Significant differences in normalized static supraglottic compression correlated with rating scale categories.
    • Significant differences in normalized dynamic supraglottic compression reflected changes between minimum and maximum compression ratings.
    • Voice-disordered groups showed significantly greater static A-P compression compared to controls (p < .03).
    • Normalized dynamic FVF compression ratios did not differ significantly between groups.

    Conclusions:

    • Static supraglottic activity quantification may serve as a diagnostic tool for voice disorders.
    • Dynamic supraglottic activity, specifically FVF motion, functions as an articulatory mechanism rather than a sign of disordered laryngeal function.