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AHI = (2 OA + 5 CA + 10 H) ÷ 8 hours of sleep
AHI = 2.13
AHI = (5 OA + 2 CA + 7 H) ÷ 6 hours of sleep
AHI = 2.33
AHI = (6 OA + 4 CA + 9 H) ÷ 8 hours of sleep
AHI = 2.38
While the patient achieved 2 more hours of logged sleep on night 2, the patient also experienced more apnea events because of the 2 extra hours that apnea events have the potential to occur. So the AHI only varied slightly even though the patient slept 25% more on night 2 versus night 1.
In conclusion, the reduction of AHI is reallistcally realistically achieved by the reduction of events that occur. Although the reduction of AHI is a good indicator of CPAP efficacy, AHI alone is not necessarily an indicator of sleep quality. Many new CPAP patients will report feeling tired even though they report AHI numbers consistently in the normal range (0-5). There are many factors that effect sleep quality. AHI is certainly one aspect of sleep quality but should not be considered as the empirical value of sleep.
[[Category:Medical terms]][[Category:CPAP data]][[Category:Diagnosis]]
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