Chapter 2 Therapy Modes and Features
15
AVAPS Rate
The AVAPS Rate setting allows you to adjust the maximum rate at which the pressure support
automatically changes to achieve the target tidal volume. The actual rate may be less than this
maximum setting depending on how far the current estimated tidal volume is from the target
tidal volume. A higher rate allows the AVAPS algorithm to change pressure support faster to meet
the target tidal volume. It can be set from 0.5 cmH
2
O per minute to 5.0 cmH
2
O per minute in
increments of 0.5 cmH
2
O per minute.
2.2.2 Bi-Flex Comfort Feature
If enabled, the device provides a comfort feature
called Bi-Flex in S mode only. The Bi-Flex attribute
adjusts therapy by inserting a small amount of
pressure relief during the latter stages of inspiration
and during active exhalation (the beginning part of
exhalation). Bi-Flex levels of 1, 2, or 3 progressively
reect increased pressure relief that will take place
at the end of inspiration and at the beginning of
expiration.
2.2.3 Ramp
The device is equipped with an optional
ramp feature. The ramp feature is designed
to oer lower pressures when activated and
then gradually increase to allow the patient
to fall asleep.
If ramp is activated with AVAPS enabled
or in AVAPS-AE mode, it will reduce the
maximum pressure support capability to
IPAP Min or Pressure Support Min and ramp to the IPAP Max or Pressure Support Max. In AVAPS-AE
mode, the EPAP will reduce to the EPAP Min setting but is not ramped, and Auto-EPAP adjusts the
pressure according to the patient’s needs. During the ramp period, the IPAP or pressure support
applied will be adjusted by the AVAPS algorithm but will be constrained by the current maximum
ramp pressure set point. The pressures (with exception of EPAP in AVAPS-AE mode) will then ramp
up to the original prescribed settings over the ramp time period.
PRESSURE
IPAP
EPAP
Ramp
Start
Ramp Button Pressed
Ramp Time
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