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