146 EN MEDUMAT Standard
2
WM 68071 05/2021
7 Description of the modes
The BiLevel + ASB mode is used for pressure-controlled ventilation
combined with free spontaneous breathing at pressure levels pInsp
and PEEP during the entire breathing cycle and for adjustable
pressure support at PEEP level. This mode is used on patients who
have no spontaneous breathing or on spontaneously breathing
patients. The patient can trigger a mandatory, pressure-controlled
mechanical breath during a predetermined trigger window.
The trigger window is 20 % of the expiratory time Te before the
anticipated mandatory mechanical breath. For the rest of the time,
the patient can breathe spontaneously or with the aid of pressure
support. Tidal volume and minute volume are determined by the
set pInsp, lung compliance and the set inspiration time T
i
.
dP
dT
Pressure
Time
TI=T
insp
∆pASB
Assisted spontaneous breathingMechanical ventilation
BiLevel + ASB
1/Freq.
(spontaneous)
1/Freq. (set)
pMax
pInsp
PEEP
Pressure
ramp
dP
dT
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