6-12
6.5.5 V-SIMV
V-SIMV is volume-synchronized intermittent mandatory ventilation mode. It provides the
minimum number of mandatory breaths based on the preset intermittent mandatory
ventilation frequency. Mandatory ventilation mode is volume mode (V-A/C mode). If patient
triggers within the trigger window, ventilator delivers mandatory volume control breath once.
Mandatory volume control breath is also delivered once if it is not triggered at the end of
trigger window. Spontaneous breathing or pressure support breathing is supported outside the
trigger window.
Trigger window is a period of buffer time for patient’s synchronization inspiration. The
period is in the later expiration phase of the mechanical ventilation. The trigger window is 5 s
long for adult and 1.5 s long for pediatric while simultaneously it cannot exceed the
expiratory time.
The following figure shows typical waveforms in V-SIMV+PSV mode.
Paw
Flow
Time
Time
SIMV cycle
Trigger
window
SIMV cycle
Volume
control
Insp. trigge
△Psupp
V-SIMV+PSV
Trigger
window
Trigger
window
Volume
control
In V-SIMV mode, you need to set the following basic ventilation parameters:
1. [O
2
%]: Oxygen concentration
2. [TV]: Tidal volume
3. [Tinsp]: Inspiration time
4. [fsimv]: Mandatory breathing frequency
5. [Tpause(%)]: Percent of inspiratory pause time
6. [ΔPsupp]: Pressure support level
7 [PEEP]: Positive end-expiratory pressure
8. [F-Trig] or [P-Trig]: Inspiration trigger level
9. [Exp％]: Expiration trigger level
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