Principles of operation
156 Instructions for use Carina SW 3.2n
Trigger
The trigger is used to synchronize mandatory
breaths with spontaneous breathing. The trigger is
also used for triggering and terminating the sup-
ported breaths with SPN-CPAP/PS, PC-BIPAP/PS
and VC-SIMV/PS.
Carina uses 3 trigger criteria to detect the breathing
effort of the patient:
– Flow gradient (flow change rate)
– Pressure
–Flow
The following settings can be selected:
– Off
– Normal
– Sensitiv.
Trigger criteria
The sensitivity in the detection of breaths and the
termination criterion for pressure-supported or vol-
ume-supported breaths are both changed with
these settings. This means that the Sensitiv. trig-
ger setting compared with the Normal setting
quickly triggers a breath and transitions early to ex-
piration.
Termination criterion of supported breaths
Inspiratory criterion Expiratory criterion
Normal Sensitiv. Normal Sensitiv.
Flow gradient Major change Minor change Major change Minor change
Pressure [mbar
or cm H
2O]
0.6 to 1 0.6 to 1 Paw high Paw high
Flow [L/min] 11 to 7 8 to 4 30 %PIF 50 %PIF
208
Sensitiv. Normal
Flow Flow
30 %PIF
PIF
PIF
50 %PIF
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