Dräger Carina

Instructions for use Carina SW 3.2n 151
Principles of operation
PC-AC
Pressure Control – Assist Control
Assisted-controlled, pressure-controlled ventilation
allowing spontaneous breathing during the entire
respiratory cycle and back-up respiratory rate
Pressure-controlled ventilation
The upper pressure level is determined by Pinsp.
The duration of the inspiratory phase of a manda-
tory breath is determined by Ti. As in all pressure-
controlled ventilation modes, the tidal volume sup-
plied depends on the difference in pressure "Pinsp
– PEEP", the lung mechanics (resistance and com-
pliance) and the patient's respiratory drive. The
pressure rise from the lower pressure level PEEP
to the upper pressure level Pinsp is defined with
the Ramp setting.
Assisted-controlled ventilation
Every inspiratory effort of the patient on PEEP level
triggers a synchronized mandatory breath. Thus,
the time and number of mandatory breaths are de-
termined by the patient. The trigger window covers
the expiratory time minus a refractory period at the
beginning of the expiration. The expiratory time is
determined by the respiratory rate RR and the in-
spiratory time Ti.
A non-synchronized mandatory breath is triggered
at the latest at the end of the expiratory time
(backup respiratory rate).
The minimal number of mandatory breaths is deter-
mined by the respiratory rate RR.
037
Paw
PEEP
1
Ti
Slow
pressure rise
Flow
t
t
Pinsp
Without spontaneous breathing
With spontaneous breathing
Trigger window
RR
Fast
pressure rise