ResMed S9 Series Clinical Guide

7
English
Apneas
The APAP algorithm only treats apneas up to 10 cm H
2
O and does not differentiate between different
types of apneas.
The enhanced AutoSet algorithm detects both obstructive and central apneas. If an apnea occurs, the
device responds appropriately.
Obstructive apnea
An obstructive apnea is when the upper airway becomes severely limited or completely obstructed.
AutoSet generally prevents obstructive apneas from occurring by responding to flow limitation and
snoring. If an obstructive apnea occurs, the device will respond by increasing pressure.
Complete airway obstruction
Time
Flow
Inspiratory flow-time curve
Absence of flow (for at least 10 sec)
Central apnea
During a central apnea, the airway will remain open, but there is no flow. When a central apnea is
detected, the device responds appropriately by not increasing pressure.
Open unrestricted airway
Time
Flow
Inspiratory flow-time curve
Absence of flow (for at least 10 sec)
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ResMed S9 Series Specifications

General

Data Storage	SD card
Device Type	CPAP Machine
Pressure Range	4 to 20 cm H2O
Sound Level	24 dB
Power Supply	100-240V AC, 50/60Hz
Therapy Modes	CPAP, VPAP ST, VPAP Auto
Altitude Adjustment	Yes
Operating Temperature	+41°F to +95°F (+5°C to +35°C)
Operating Humidity	10% to 95% non-condensing
AC Voltage	100-240V AC
Humidifier	optional
Ramp	Yes