Dräger Cato - SIMV, Synchronised Intermittent Mandatory Ventilation

SIMV
Synchronized Intermittent Mandatory
Ventilation
Mixture of mechanical ventilation and spontaneous
breathing.
In SIMV mode, the patient can breathe spontaneously
at specified regular intervals. Between these intervals,
mandatory (i.e. automatically delivered) ventilation strokes
ensure a minimum degree of ventilation.
The mandatory ventilation strokes are the same as those
for IPPV ventilation. They are defined by the parameters
VT, IPPV frequency fIPPV, TI:TE and TIP.
Each mandatory breath is followed by a pause in which
the patient can breathe spontaneously.
In order to prevent the next mandatory breath being
applied during the expiratory phase of spontaneous
breathing, a trigger function ensures that the mandatory
ventilation stroke is synchronized with the inspiratory
spontaneous breathing phase during an expectation
period.
The time between the end of each mandatory ventilation
stroke and the beginning of the next is subdivided into a
spontaneous breathing time TSpont and a trigger time
TTrigger.
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Descriptions
SIMV
Paw
t
Trigger
window (
T
Trigger)
Mandatory breath
Start of a new
mandatory breath
after triggering
TInsp TExsp
1
/fIPPV
TInsp TExsp
1
/fIPPV
TSpont
Trigger window
1
/fIMV
∆T
T
Spont
1
/fIMV
Start of a new
mandatory breath
without triggering
Trigger window
TTrigger
TTrigger
Airway pressure over time:
08528971