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== Justifying ASV ==
[[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.
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
=== Five types of Central Sleep Apnea ===
# Paradoxical breathing
A central hypopnea will have none of the above. Central Hypopnea. Central hypopneas are associated with reductions of purely in-phase thoracic and abdominal effort or movement signals, followed by an increase in chest and belly movements at the end. There is no evidence of phase shifting or paradoxical breathing, no airflow flattening, and no snoring throughout the entire central hypopnea.
A Central AHI is composed of Central Apnea and Central Hypopnea.
The Central Apnea numbers are easily extracted from modern PAP machines which report detailed efficacy data. We need to concentrate on Central Hypopnea numbers to demonstrate a '''Central AHI >5''' and that '''Central apneas and Central hypopneas >50% of total AHI''' Central Hypopnea. Central hypopneas are associated with reductions of purely in-phase thoracic and abdominal effort or movement signals, followed by an increase in chest and belly movements at the end. There is no evidence of phase shifting or paradoxical breathing, no airflow flattening, and no snoring throughout the entire central hypopnea.
=== Charts identifying Central Hypopneas ===
[http://www.apneaboard.com/CSA-and-ASV-Updated-Morgan.pdf CSA-and-ASV-Updated-Morgan.pdf]
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