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[S/z ratio in glottic closure defects]

F J Gamboa1, A Nieto, A J del Palacio

  • 1Servicio de ORL, Hospital Príncipe de Asturias, Insalud, Universidad de Alcalá de Hénares.

Acta Otorrinolaringologica Espanola
|January 1, 1995
PubMed
Summary

The s/z ratio, comparing /s/ and vowel sound duration, helps detect laryngeal pathology. A ratio over 1.4 indicates a glottic closure defect, aiding in diagnosing vocal cord issues.

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Area of Science:

  • Laryngology
  • Speech-Language Pathology
  • Bioacoustics

Background:

  • The s/z ratio quantifies expiratory airflow resistance.
  • It differentiates between glottic and supraglottic airflow resistance.
  • This ratio minimizes respiratory influence on phonation time measurements.

Purpose of the Study:

  • To assess the s/z ratio's clinical utility for identifying laryngeal pathology.
  • To correlate s/z ratio values with the severity of glottic closure defects.

Main Methods:

  • Measured the s/z ratio in 72 patients with organic vocal cord pathology.
  • Assessed glottic closure using videolaryngostroboscopy.
  • Measured the s/z ratio in 22 healthy subjects for comparison.

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Main Results:

  • Normal-speaking subjects exhibited an s/z ratio near 1.0.
  • Patients with glottic closure defects showed an s/z ratio exceeding 1.4.
  • Organic lesions impairing glottic closure reduced airflow resistance, shortening vowel phonation time.

Conclusions:

  • The s/z ratio is a valuable clinical indicator for laryngeal pathology.
  • An s/z ratio > 1.4 suggests impaired glottic closure.
  • This non-invasive measure aids in diagnosing vocal cord dysfunction.