Central Sleep Apnoea; S9 Essentials; Sleep Quality - ResMed S9 Elite Clinical Manual

Central sleep apnoea

The S9 Series detects both obstructive and central sleep apnoeas (CSA). CSA detection uses the Forced
Oscillation Technique (FOT) to determine the state of the patient's airway during an apnoea. When an
apnoea has been detected, small oscillations in pressure (1 cm H
the current device pressure. The CSA algorithm uses the resulting flow and pressure (determined at the
mask) to measure the airway patency.
Respiratory flow

S9 Essentials

S9 Essentials is designed to make device interaction and menu navigation easier for patients. If enabled,
S9 Essentials disables the Info and Setup functionality so that patients can simply start and stop therapy
and adjust ramp, humidification and Climate Control. S9 Essentials can be enabled via Clinical Setup >
Options > Access.

Sleep quality

Designed to promote compliance, the Sleep Quality indicator allows the patient to actively engage in
their own therapy by identifying leak, usage and AHI information. This information can be set to:
• Usage—where only usage hours are displayed
• On—where usage, leak and AHI information are displayed.
8
O peak-to-peak at 4 Hz) are added to
2
10 sec
4 sec 6 sec
delay
CSA detector
(respiratory
begins
pause)
Apnea type
detected -
Central or
Obstructive