154
EN MEDUMAT
Standard
2
WM
6807
1
0
5
/2
021
7 Description of the modes
The controlled PRVC + ASB mode 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 mechanical breaths with the set tidal volume
and decreasing flow. The volume-controlled mechanical breaths
have a plateau time of 50 % of the configured inspiration time T
i
.
The device selects the measured plateau pressure as the starting
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 device 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 tube compliance. This enables precise
control of the required tidal volume, in particular of small tidal
volumes under high airway pressures. The set maximum ventilation
pressure (pMax) ensures the safety of the patient. For safety
reasons, the inspiratory pressure (pInsp) is at least 5 mbar below
the set maximum ventilation pressure (pMax).
Pressure
Time
PRVC + ASB
pMax
1/Freq. (set)
1/Freq. (set)
volume-controlled
mechanical breath
pressure-controlled
mechanical breath
Safety
distance 5 mbar
Increment
max. 3 mbar
pPlateau
pInsp (variable)
PEEP
pressure-controlled
mechanical breath
∆pASB
Summary of Contents for MEDUMAT Standard2
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