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Physiological Determinants of Snore Loudness.
Daniel Vena1, Laura Gell1, Ludovico Messineo1
1Division of Sleep and Circadian Disorders, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
Annals of the American Thoracic Society
|October 25, 2023
Summary
Ventilatory drive, not just airway obstruction, significantly impacts snore loudness. Increased breathing effort amplifies snoring, especially with moderate obstruction, while severe obstruction can silence snoring.
Area of Science:
- Respiratory Physiology
- Sleep Medicine
- Acoustic Analysis
Background:
- Physiological factors influencing snoring severity are not fully understood.
- Airway obstruction is a primary cause of snoring, but ventilatory drive's role is under-investigated.
Purpose of the Study:
- To investigate the relationship between airway obstruction and ventilatory drive in determining snore loudness.
- To develop a more comprehensive understanding of snoring physiology.
Main Methods:
- Studied 40 patients with suspected or diagnosed obstructive sleep apnea.
- Measured airflow, ventilatory drive (diaphragm EMG), and tracheal snore loudness.
- Defined "obstruction" as the flow:drive ratio and analyzed 165,063 breaths using mixed-model analysis.
Main Results:
- Snore loudness increased significantly with ventilatory drive under moderate obstruction (flow:drive=50%).
- The effect of ventilatory drive on snore loudness was minimal without obstruction.
- Snore loudness increased with obstruction only when ventilatory drive was elevated; severe obstruction (flow:drive<20%) reduced snore loudness.
Conclusions:
- Ventilatory drive is a critical modulator of snore loudness, alongside airway obstruction.
- This finding provides a new framework for understanding snoring severity and developing diagnostic technologies for sleep-disordered breathing.
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