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Description of the ventilation modes
VC-SIMV
Volume Control – Synchronized Intermittent Man-
datory Ventilation
Intermittent, triggered, volume-controlled ventila-
tion, allowing spontaneous breathing during the ex-
piratory phase with AutoFlow and pressure sup-
port.
Paw
PEEP
Flow
Volume-controlled ventilation
The tidal volume of the mandatory breaths is deter-
mined by the volume VT. The duration of the inspir-
atory phase of a mandatory breath is determined by
Ti. The pressure rise is determined by the Ramp
setting. The peak inspiratory pressure PIP is limited
by the Pmax setting.
Synchronization
The mandatory breaths can be triggered by the pa-
tient's inspiratory effort on PEEP level.
Instructions for use Carina SW 3.2n
Slow
Fast
pressure rise
pressure rise
PIP
Ti
1
RR
Without spontaneous
breathing
Pressure support
Trigger window
With spontaneous
breathing
A mandatory breath can only be triggered within a
"trigger window" by the flow trigger in synchrony
with the patient's inspiratory effort. This prevents
the mandatory breath being applied during expira-
tion.
The trigger window has a maximum duration of
5 seconds. For expiratory times shorter than
5 seconds, the trigger window covers the entire ex-
piratory time minus a refractory period of 500 ms to
the beginning of the expiration.
The synchronization of the mandatory breath re-
duces the expiratory time.
Principles of operation
Pmax
t
t
145
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