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An acoustic screening test for obstructive sleep apnoea

A W McCombe1, V Kwok, W M Hawke

  • 1Department of Otolaryngology University of Toronto, Canada.

Clinical Otolaryngology and Allied Sciences
|August 1, 1995
PubMed
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A new acoustic index (Hawke Index) can help screen for obstructive sleep apnoea (OSA) by analyzing snoring sounds. This index shows a significant correlation with OSA severity, potentially aiding in diagnosis.

Area of Science:

  • Otolaryngology
  • Sleep Medicine
  • Acoustics

Background:

  • Obstructive sleep apnoea (OSA) is a common sleep disorder.
  • Snoring is a frequent symptom of OSA.
  • Current diagnostic methods for OSA can be invasive or resource-intensive.

Purpose of the Study:

  • To investigate acoustic differences in snoring sounds between patients with OSA and simple snoring.
  • To develop and validate a novel acoustic index for OSA screening.

Main Methods:

  • Third-octave sound analysis of snoring sounds from 9 OSA patients and 18 simple snorers.
  • Development of the Hawke Index (HI) based on the ratio of A-weighted to linear sound levels (HI = dB(A)/dB(SPL) for Lmax).
  • Correlation analysis between HI and the apnoea/hypopnoea index (AHI).

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Main Results:

  • Both groups showed a low-frequency peak around 80 Hz.
  • The OSA group exhibited a significantly higher high-frequency sound component.
  • A significant positive correlation (r = 0.73) was found between HI and AHI.
  • A HI threshold of 0.90 demonstrated 67% sensitivity and 100% specificity for OSA.

Conclusions:

  • The Hawke Index effectively differentiates OSA from simple snoring based on acoustic properties.
  • The HI shows promise as a non-invasive screening tool for OSA.
  • Further research and development could integrate this acoustic analysis into clinical practice for OSA diagnosis.