During polysomnography, the patient has 15 periods of apnea and 10 episodes of hypopnea dur-ing 6 hours of sleep. What is their apnea hypopnea index?
a. 2.5 c. 4.2
b. 3.5 d. 5.6
ANS: C
The apnea hypopnea index is calculated by taking the sum of the total number of apneas and the number of episodes of hypopnea. The total is then divided by the number of hours of sleep.
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