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Sleep Apnea
Obstructive Sleep Apnea
- Recurrent episodes of obstructive breathing during sleep caused by collapse of the upper airways.
Definitions
- Apnea—episodes of paused breathing lasting for at least 10 seconds
- Hypopnea—inadequate or shallow breathing episodes lasting for at least 10 seconds with at least 4% oxygen desaturation and at least 30% reduction in airflow; also defined as decrease in tidal volume by at least 50% from baseline
Respiratory Disturbance Index
- Total number of apneic and hypopneic events per hour of sleep
- 5-15 mild
- 15-30 moderate
- 30 is severe
Epworth Sleepiness Score
- A self-administered questionnaire with 8 questions that provides a person’s general level of daytime sleepiness. Score can range from 0 to 24; the higher the score, the higher the daytime sleepiness.
Fujita Classification of OSA Obstructive Locations
- Type I: oropharynx
- Type II: oropharynx and hypopharynx
- type III: hypopharynx
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