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Chapter 3 Modes, Features, and Alarms
31
Bi-Flex
In S mode, the Bi-Flex attribute adjusts therapy by inserting a small
amount of pressure relief during the latter stages of inspiration and
during the beginning part of exhalation. In the following diagram,
the bold lines represent Bi-Flex in comparison to the dashed line
representing normal BiPAP therapy. 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.
PRESSURE
IPAP
EPAP
TIME
BiPAP
Bi-Flex
3
1
2
Ramp
The device is equipped with a linear ramp function. In CPAP, S, S/T, T,
and PC modes, the Ramp feature will reduce the pressure and then
gradually increase (ramp) the pressure to the prescription pressure
setting so patients can fall asleep more comfortably. The gure below
illustrates how the ramp function works.
TIME
Note: Bi-Flex is only available
up to 25 cm H
2
O in S mode.
Bi-Flex in Comparison to
Traditional Bi-Level Therapy
Note: IPAP will not ramp below
4 cm H
2
O.
The Ramp Function