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Does snoring intensity predict flow limitation or respiratory effort during sleep?
R Stoohs1, A Skrobal, C Guilleminault
1Stanford University Medical School, Stanford Sleep Disorders Clinic and Research Center, CA 94305.
Respiration Physiology
|April 1, 1993
Summary
Snoring sound intensity poorly predicts breathing changes during sleep. However, snoring intensity can help identify individuals experiencing high inspiratory efforts during obstructed breathing.
Area of Science:
- Sleep Medicine
- Respiratory Physiology
Background:
- Obstructed breathing during sleep, often accompanied by snoring, can indicate varying degrees of respiratory effort.
- Assessing respiratory effort non-invasively is crucial for understanding sleep-disordered breathing.
Purpose of the Study:
- To evaluate snoring sound intensity (SSI) as a predictor of respiratory effort and inspiratory volume decrease during sleep.
- To determine if SSI can identify individuals with significant negative inspiratory efforts during obstructed breathing.
Main Methods:
- Nocturnal polysomnography was used in six snorers.
- Measurements included esophageal pressure (Pes) for respiratory effort, airflow (tidal volume [VT]), and snoring sound intensity (SSI).
Main Results:
- Snoring sound intensity (SSI) was a poor predictor of airflow limitation (tidal volume [VT]).
- SSI showed a significant positive correlation with peak-negative inspiratory efforts (Pes) across subjects.
- SSI effectively predicted the level of peak-negative inspiratory effort during obstructed breathing for individual subjects.
Conclusions:
- Snoring sound intensity is not a reliable indicator of flow limitation during sleep.
- Snoring sound intensity can serve as a useful indicator for identifying subjects with high peak negative inspiratory efforts during obstructed, noisy breathing.