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Pressure
pMax
PEEP
volume-controlled
mechanical breath
1/Freq. (set)
The controlled ventilation mode PRVC + ASB combines the advantages of both pressure-
controlled ventilation and volume-controlled ventilation. The set tidal volume is applied
with the minimum ventilation pressure possible.
Ventilation begins with three volume-controlled breaths with the set tidal volume and
decreasing flow. The volume-controlled breaths have a plateau time of 50% of the
configured inspiration time T
value for the inspiratory pressure pInsp of the following pressure-controlled ventilation. It
measures the administered volumes and adjusts the ventilation pressure accordingly. If the
lung parameters change during ventilation, the unit alters the inspiratory pressure pInsp in
increments of a maximum of 3 mbar in order to achieve the set tidal volume again and
thereby automatically compensate for changes in the patient.
Measuring the applied volume is improved by compensating hose compliance. This enables
precise control of the required tidal volume, in particular of small tidal volumes under high
airway pressures.
The set maximum pressure limitation (pMax) ensures the safety of the patient. For safety
reasons inspiratory pressure pInsp is 5 mbar below the set maximum pressure limitation
(pMax). Once maximum ventilation pressure (pMax - 5 mbar) is achieved, the unit
administers as much volume as possible. If this volume deviates from the set tidal volume,
the unit triggers the low-priority alarm "Vt not achievable".
pPlat
pressure-controlled
mechanical breath
1/Freq. (set)
. The unit selects the measured plateau pressure as starting
i
pInsp (variable)
pressure-controlled
Ventilation modes
Safety
margin 5 mbar
Increments
max. 3 mbar
mechanical breath
EN
Time
77
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