Dräger Instructional CD: Mechanical Ventilation - VentWorld
Dräger Instructional CD: Mechanical Ventilation - VentWorld
Dräger Instructional CD: Mechanical Ventilation - VentWorld
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5. How To Read Ventilator Displays<br />
DC-CMV (dual control within breaths: pressure control to volume control)<br />
Muscle<br />
Pressure<br />
Ventilator<br />
Pressure<br />
Volume<br />
Flow<br />
A B<br />
patient<br />
triggered<br />
large<br />
inspiratory<br />
effort<br />
set pressure limit<br />
pressure limit<br />
over-ridden<br />
no<br />
inspiratory<br />
effort<br />
set volume target<br />
volume target<br />
not met<br />
volume cycled<br />
flow cycled<br />
volume met before<br />
flow decays to set limit<br />
set flow limit<br />
switch from pressure control<br />
to volume control<br />
inspiratory flow<br />
equals flow limit<br />
In (A) the patient’s inspiratory effort is assisted by a Pressure Support type breath. The tidal<br />
volume target is met before flow decays to the set flow limit, and the breath is flow cycled. If<br />
the patient effort decreases enough that tidal volume is not met by the time flow decays to<br />
the set flow limit, then the control variable switches from pressure to volume (B). The<br />
breath proceeds at the set flow limit and is volume cycled when the target tidal volume is<br />
met. Notice that when this happens, airway pressure rises above the set pressure limit.<br />
Examples of this mode are Volume Assured Pressure Support on the Bird 8400 and Tbird<br />
ventilators and Pressure Augmentation on the Bear 1000 ventilator.<br />
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