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Functional staging for vocal cord paralysis.

P Woo1, R Colton, D Brewer

  • 1Department of Otolaryngology and Communication Sciences, SUNY Health Science Center, Syracuse 13210.

Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
|September 1, 1991
PubMed
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Objective testing reliably assesses vocal cord paralysis. Measurements like phonatory mean flow rate (MFR) and maximum phonation time (MPT) correlate with vocal ability and aid in functional staging for treatment.

Area of Science:

  • Otolaryngology
  • Speech-Language Pathology
  • Medical Diagnostics

Background:

  • Vocal cord paralysis significantly impacts phonatory function.
  • Objective assessment methods are crucial for evaluating vocal deficits.
  • Existing clinical assessments may not fully capture the extent of functional impairment.

Purpose of the Study:

  • To establish reliable objective testing for phonatory function post-vocal paralysis.
  • To correlate clinical history with objective vocal measurements.
  • To develop a functional staging system for vocal cord paralysis.

Main Methods:

  • Review of 116 cases with objective testing in 55 patients.
  • Measurement of phonatory mean flow rate (MFR), maximum phonation time (MPT), and maximum decibel output (SPL).

Related Experiment Videos

  • Correlation analysis between clinical history (vocal ability, aspiration) and objective parameters.

    • Main Results:

    • Clinical history significantly correlated with MFR, MPT, and SPL.
    • A four-stage classification system was formulated based on these measurements.
    • Stage I (near-normal) and Stage IV (severe disability) parameters were defined (e.g., MPT, SPL).
    • Factors like sex, age, weight loss, and malignancy influence vocal deficit severity.
    • Post-therapy showed improved MPT and SPL, with decreased MFR.

    Conclusions:

    • MFR, MPT, and SPL are valuable objective indicators for clinicians.
    • The developed functional staging system aids in assessing and treating vocal cord paralysis.
    • Objective measurements provide a reliable basis for understanding and managing phonatory dysfunction.