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Therapy modes
The following table describes the therapy modes available on the S9 VPAP Tx.
Therapy mode Description
CPAP (Continuous Positive Airway
Pressure)
Delivers a fixed pressure with optional Expiratory
Pressure Relief (EPR). EPR can improve patient comfort.
AutoSet Delivers CPAP therapy with optional Expiratory Pressure
Relief (EPR). Automatically adjusts the CPAP pressure in
response to snore, flow limited breaths and apneas.
VAuto Automatically adjusts pressure in response to flow
limitation, snore and apneas. Pressure Support (PS) is
fixed throughout the night and can be set by the clinician.
Min EPAP and Max IPAP restrict the delivered pressure
range.
Bilevel Provides for control over a number of related bilevel
therapy modes—S, S/T and T. In all cases you may set
two treatment pressures— one for inspiration (IPAP) and
one for expiration (EPAP). The difference between IPAP
and EPAP levels is the pressure support.
S (Spontaneous) Senses when the patient is inhaling and exhaling
and supplies the appropriate pressures accordingly.
The difference between IPAP and EPAP levels helps
determine the tidal volume.
S/T (Spontaneous/ Timed) Augments any breath initiated by the patient, but will also
supply additional breaths should the patient breath rate
fall below the clinician's set backup respiratory rate.
T (Timed) The fixed respiratory rate and the fixed inspiration/
expiration time set by the clinician is supplied regardless
of patient effort.
PAC (Pressure Assist Control) The inspiration time is preset in the PAC mode. There
is no spontaneous/flow cycling. The inspiration can be
triggered by the patient when respiratory rate is above a
preset value, or time triggered breath will be delivered at
the backup breath rate.
ASV (Adaptive Servo-ventilation) Treats central sleep apnea and/or mixed apneas and
periodic breathing. In ASV mode, the expiratory positive
airway pressure (EPAP) is adjusted by the clinician to
maintain upper airway patency, while Min PS and Max
PS restricts the range of automatically adjusted pressure
support.
ASVAuto (Automatic Adaptive
Servo-ventilation)
Treats central sleep apnea and/or mixed apneas and
periodic breathing. In ASVAuto mode, the expiratory
airway pressure (EPAP) is automatically adjusted to
maintain upper airway patency between the limits set
by Min EPAP and Max EPAP, while Min PS and Max PS
restrict the range of automatically adjusted pressure
support.
iVAPS (intelligent Volume-Assured
Pressure Support)
Maintains a preset target alveolar minute ventilation by
monitoring delivered ventilation, adjusting the pressure
support and providing an intelligent backup breath
automatically.