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Soft phonation index - a sensitive parameter?

Mili Mary Mathew1, Jayashree S Bhat

  • 1Department of Audiology & Speech Language Pathology, Kasturba Medical College (Unit of Manipal University), Mangalore, Karnataka, 575 001 India.

Indian Journal of Otolaryngology and Head and Neck Surgery : Official Publication of the Association of Otolaryngologists of India
|November 3, 2012
PubMed
Summary
This summary is machine-generated.

The Soft Phonation Index (SPI) effectively detects incomplete vocal fold closure in men with unilateral vocal nodules, offering a sensitive acoustic measure for voice disorder diagnosis. Further research should explore contributing physiological factors.

Keywords:
Objective assessmentSPIVoice disorders

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Area of Science:

  • Otolaryngology
  • Speech-Language Pathology
  • Acoustic Analysis

Background:

  • Voice disorder diagnosis relies on perceptual and acoustic methods.
  • Assessing vocal fold closure is crucial for understanding laryngeal function.
  • Soft Phonation Index (SPI) quantifies vocal fold approximation, with higher values indicating incomplete closure.

Purpose of the Study:

  • To evaluate the sensitivity of the acoustic parameter SPI in detecting incomplete vocal fold adduction.
  • To analyze SPI values in male patients diagnosed with unilateral vocal nodules compared to a control group.

Main Methods:

  • Sixty participants (30 controls, 30 with unilateral vocal nodules) were included.
  • Phonation samples of the vowel /a/ were recorded using Kay Elemetrics CSL 4150.
  • SPI values from Multi Dimensional Voice Program (MDVP) analysis were statistically compared using an independent samples t-test.

Main Results:

  • A statistically significant difference was found in mean SPI values between the control and experimental groups.
  • SPI demonstrated sensitivity in identifying abnormalities in vocal fold approximation in individuals with vocal nodules.

Conclusions:

  • SPI is a sensitive acoustic parameter for detecting altered vocal fold closure in unilateral vocal nodules.
  • Findings align with previous studies on vocal fold palsy and cordectomy, where SPI indicated breathiness.
  • Further research is needed to establish normative SPI values for the Indian population and explore factors influencing individual variations.