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== Definition Central/Mixed/Complex Apnea ==
'''Central sleep apnea (CSA)''' is defined as:
# An apnea-hypopnea index '''(AHI) greater than 5''', and
# There is no evidence of daytime or nocturnal hypoventilation
'''Complex sleep apnea (CompSA)''' (also called Mixed apnea) is a form of central apnea specifically identified by all of the following:
# With use of a positive airway pressure device without a backup rate (E0601 (CPAP) or E0470 BiLevel/BiPAP wo Backup), the polysomnogram (PSG) shows a pattern of apneas and hypopneas that demonstrates the persistence or emergence of central apneas or central hypopneas upon exposure to CPAP (E0601) or a bi-level device without backup rate (E0470) device when titrated to the point where obstructive events have been effectively treated (obstructive AHI less than 5 per hour).
# '''After resolution of the obstructive events''', the sum total of central apneas plus central hypopneas is greater than 50% of the total apneas and hypopneas; and
[[Central sleep apnea (CSA)|Central Sleep Apnea (CSA)]] is the cessation of respiratory effort result in a lack of respiratory movements. During sleep, your breathing is disrupted regularly because of how your brain functions, your brain simply doesn't tell your body to breathe, and therefore you don't try to breathe.
=== Five types of Central Sleep Apnea ===
# Central apneas and Central hypopneas >50% of total AHI
# Not better explained by another sleep disorder
''[http://www.apneaboard.com/CSA-and-ASV-Updated-Morgan.pdf CSA and ASV Updated Morgan]''
=== Event Definition Apnea, Hypopnea, Flow Limitation ===
* [[Obstructive sleep apnea (OSA)|Apnea]]: 80% to 100% reduction in airflow for >= 10 seconds
* [[Hypopnea]]: 50% to 80% reduction in airflow for >= 10 seconds
* [[Flow Limitation]]: <50% reduction in airflow for >= 10 seconds
These events may be either Obstructive or Central in nature
They represent different degrees of similar events. All of these may be disruptive.
While Central Hypopneas are important in diagnosing Central.Mixed.Complex apnea they are not monitored in most Sleep Studies.
=== Hypopneas - Obstructive and Central ===
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