BiLevel + ASB: Ventilation at two pressure levels + Assisted Spontaneous Breathing
The BiLevel + ASB mode is used for pressure control ventilation combined with free spontaneous respiration at pressure levels pInsp and PEEP during the entire ventilation cycle and adjustable pressure support at PEEP level. This mode is used on patients who have no spontaneous respiration or on spontaneously breathing patients.
The patient can trigger a mandatory, pressure-controlled mechanical breath during a predetermined trigger time slot. The trigger time slot 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. The tidal volume and minute volume are determined by the set pInsp, lung compliance, and the set inspiratory time Ti.
The following ventilation parameters can be set:
pInsp: Inspiratory pressure in mbar
Freq.: Ventilation rate in 1/min
PEEP: Positive end-expiratory pressure in mbar
pMax: Maximum inspiratory pressure in mbar
Δ pASB: Pressure support (relative to the set PEEP)
InTr: Inspiratory trigger
ExTr: Expiratory trigger
I:E: Inspiratory-expiratory time ratio