Therapy modes

The following table describes the therapy modes available on the S9 VPAP Tx.

Therapy mode

Description

CPAP (Continuous Positive Airway

Delivers a fixed pressure with optional Expiratory

Pressure)

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

Treats central sleep apnea and/or mixed apneas and

Servo-ventilation)

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

Maintains a preset target alveolar minute ventilation by

Pressure Support)

monitoring delivered ventilation, adjusting the pressure

 

support and providing an intelligent backup breath

 

automatically.

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ResMed S9 VPAP Tx manual Therapy modes, Therapy mode Description