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Palatal snoring identified by acoustic crest factor analysis.

P D Hill¹, B W Lee, J E Osborne

¹North Wales Medical Physics, Glan Clwyd Hospital, Rhyl, UK.

Physiological Measurement

|July 2, 1999

Summary

A new crest factor analysis of snoring sounds can accurately differentiate palatal from non-palatal snoring. This non-invasive method shows promise for guiding ENT surgical decisions regarding palatal surgery.

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Area of Science:

Otolaryngology
Acoustic Analysis
Sleep Medicine

Background:

Differentiating palatal from non-palatal snoring is crucial for ENT surgeons to determine the efficacy of palatal surgery.
Current gold standard for diagnosis is sleep nasendoscopy.
Palatal vibration causes significant low-frequency sound modulation.

Purpose of the Study:

To investigate the use of sound waveform crest factor as a non-invasive method to distinguish palatal from non-palatal snoring.
To assess the diagnostic potential of crest factor analysis in snoring.

Main Methods:

Recorded free-field snore sounds from 11 sedated adult patients.
Calculated the crest factor (peak-to-RMS ratio) of the sound waveform.
Compared acoustic findings with simultaneous sleep nasendoscopy results.

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Main Results:

The crest factor was significantly higher in palatal snorers compared to non-palatal snorers (p < 0.01).
Palatal and non-palatal snoring could be distinguished in all 11 cases using crest factor alone.
Six patients were identified as soft palate snorers; five as non-palatal (epiglottic, hypopharyngeal, tongue base).

Conclusions:

Crest factor analysis of snoring sounds is a promising non-invasive technique for differentiating palatal from non-palatal snoring.
This acoustic method could aid ENT surgeons in pre-operative assessment and treatment planning.