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The device detects both obstructive and central sleep apneas (CSA). CSA detection uses the Forced
Oscillation Technique (FOT) to determine the state of the patient's airway during an apnea. When an
apnea has been detected, small oscillations in pressure (1 cm H
O peak-to-peak at 4 Hz) are added
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to the current device pressure. The CSA detection algorithm uses the resulting flow and pressure
(determined at the mask) to measure the airway patency.
Cheyne-Stokes respiration detection
Available in all modes on the AirSense 10 AutoSet, AirSense 10 AutoSet for Her and the
AirSense 10 Elite.
Cheyne-Stokes respiration (CSR) is a form of sleep-disordered breathing characterized by a periodic
waxing and waning of respiration. The waxing periods (hyperpneas, typically 40 seconds in length)
can include large gasping breaths that tend to arouse the patient while the waning periods
(hypopneas or apneas, typically 20 seconds in length) cause blood oxygen desaturations.
The following example shows a typical CSR period.
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