Ventilation modes
English
71
P-SIMV - Pressure Synchronised Intermittent Mandatory Ventilation
P-SIMV is a mixed ventilation mode delivering pressure-controlled mandatory breaths and
pressure-supported spontaneous breaths.
Mandatory breaths are delivered at a set frequency and spontaneous breaths are permitted between
mandatory breaths.
For mandatory breaths
The inspiratory pressure support is set using P control and is initiated by either:
-
the ventilator at a set respiratory rate
-
the patient - if the patient effort is close enough to the next scheduled mandatory breath. This
time is 60% of the breath period or 10 seconds, whichever is less.
End of inspiration (switch from inspiration to expiration) is controlled by the ventilator (time-triggered
breath)
For spontaneous breaths
The inspiratory pressure support is set using PS. Inspiration is either:
-
Initiated by the patient (spontaneous-triggered breath)
-
Ended by the patient (spontaneous-cycled breath)
The patient is free to take any number of spontaneous breaths between mandatory breaths.
Parameter
Setting
Resp.rate
(per min)
Mandatory breaths:
Adult: 2 to 50 [10]
Paed: 5 to 80 [20]
PEEP
(cmH
2
O)
Off, 3.0 to 20.0 [5.0]
P control
(cmH
2
O)
Mandatory breaths:
Adult: 2 to 50 [7]
Paed: 2 to 50 [7]
PS
(cmH
2
O)
Spontaneous breaths:
Adult: 2 to 50 [7]
Paed: 2 to 50 [7]
Ti
(sec)
Mandatory breaths
Adult: 0.2 to 5.0 [1.0]
Paed: 0.2 to 5.0 [0.6]
Cycle
(%)
Spontaneous breaths:
5 to 90, Auto [Auto]
Trigger type
Flow / Pressure
Trigger
When Trigger Type is set to
Flow:
(double limb circuit only)
Adult: 0.5 to 15 [1.0] (L/min)
Paed: 0.5 to 15 [0.5] (L/min)
When Trigger Type is set to
Pressure:
(double and single limb circuit)
Very Low to Very High [Medium]
Rise Time
(msec)
Min, 150 to 900 [200]
Summary of Contents for Astral 100
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