126 EN MEDUVENT Standard
WM 67851 01/2021
10 Description of the modes
PRVC + PS mode combines the benefits of pressure-controlled and
volume-controlled ventilation. The set tidal volume is administered
with the minimum ventilation pressure possible. Ventilation starts
at low ventilation pressures P
insp
and reaches target volume after a
few breaths. In the phase between mandatory mechanical breaths,
the patient can breathe spontaneously at CPAP level or trigger
pressure support (PS). If triggers are triggered within the trigger
window (20 % before the mandatory breath), the mandatory
breath is synchronized.
The volumes administered are measured and ventilation pressure
adapted according to the situation. If lung parameters change
during ventilation, the device alters inspiratory pressure P
insp
in
order to achieve the set tidal volume again and thereby
automatically compensate for changes in the patient. Measuring
the volume administered is improved by compensating hose
compliance. This enables precise control of the required tidal
volume, in particular at low tidal volumes under high airway
pressures. The set maximum pressure limit (pMax) ensures the
safety of the patient. For safety reasons, the maximum inspiratory
pressure (P
insp
) is at the level of the pressure limit (pMax).
If the volume achieved deviates from the set tidal volume, the
device triggers the medium-priority alarm Vt not achievable.
10.5 SIMV (optional)
Description
Abbreviation SIMV
Long form Synchronized Intermittent Mandatory Ventilation
Type Volume-controlled
Requirements SIMV option has been activated
Ventilation parameters
• pMax
•Freq.
•Vt
•InTr
•PEEP
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