A 55-year-old obese man with daytime somnolence undergoes polysomnography. Results show 45 apneic events and 30 hypopneic events during 7 hours of sleep. What is the Apnea-Hypopnea Index and the severity classification?
- A AHI 7.5, mild OSA
- B AHI 10.7, mild OSA ✓
- C AHI 10.7, moderate OSA
- D AHI 7.5, moderate OSA
Correct answer: B. AHI 10.7, mild OSA
Explanation
AHI equals total events divided by hours of sleep. Here, 45 plus 30 equals 75 events divided by 7 hours, giving 10.7 events per hour. Mild OSA is defined as AHI 5 to 15, moderate as 15 to 30, and severe as greater than 30. Therefore, this is mild OSA.
Reference: International Classification of Sleep Disorders, 3rd (ICSD-3) ed.
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