More About Ivaps - ResMed VPAP ST-A User Manual

The common adjustable settings for different modes in the VPAP ST-A are shown below.
Settings
Set pressure
IPAP
EPAP
Respiratory rate
Ti
Target Va
Target Patient Rate
Ti Max
Ti Min
Rise time
Trigger sensitivity
Cycle sensitivity
Min PS
Max PS
Height

More about iVAPS

You may prefer some assurance that the patient's ventilatory needs will be defended if their condition
varies. A variety of 'dual mode' schemes exist, that aim to combine the benefits of pressure target and
volume target, most of which can be categorised generically as volume-assured pressure support, or
VAPS modes.
With VAPS devices in general, the ventilatory assistance (pressure support) aims to automatically adjust
to changes in patient condition over time, typically to maintain a target tidal volume.
Max PS
Min PS
Pressure
iVAPS offers the comfort and synchrony of pressure support, but with the assurance offered by a volume
target. iVAPS has the following advantages over traditional VAPS schemes:
• iVAPS is a unique combination for a servo-controlled ventilator, in that iVAPS has the goal of
regulating alveolar ventilation to a prescribed target, and iVAPS has a swift but gentle servocontrol
response. iVAPS is tuned to be fast enough to avoid blood-gas derangement associated with most
breathing challenges, including during sleep, but is gentle enough to avoid disruption.
• iVAPS has an intelligent Backup Rate (iBR) which aims to keep 'out of the way' while the patient is
breathing, yet during sustained apnoea will mimic the patient's own breath rate. This contributes to
iVAPS' ability to maintain its ventilation target and so stabilise blood gases even during sleep.
• iVAPS has ResMed's robust leak compensation scheme (Vsync). This promotes synchrony and
comfort even during significant leak.
6
S ST
ü ü
ü ü
ü
ü ü
ü ü
ü ü
ü ü
ü ü
Time
T PAC iVAPS
ü ü
ü ü
ü ü
ü ü
ü ü
ü
Pressure
Target alveolar ventilation
Current alveolar ventilation
CPAP
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü