A5/A3â„¢ Operating Instructions 046-003777-00 5 - 17
Operations Ventilation Modes
SIMV-VC means to deliver synchronized intermittent mandatory volume controlled ventilation to
the patient. In the SIMV-VC mode, the ventilator waits for patient’s next inspiration based on the
specified time interval. The sensitivity depends on Trigger. If Trigger is reached within the trigger
waiting time (called synchronous trigger window), the ventilator delivers volume controlled
ventilation synchronously with the preset tidal volume and inspiratory time. If the patient does
not inspire within the trigger window, the ventilator delivers volume controlled ventilation to the
patient at the end of trigger window. Spontaneous breathing outside trigger window can acquire
pressure support.
In VCV and SIMV-VC modes, when inspiration pressure reaches Plimit, the inspiration pressure is
held.
5.6.9.3 Synchronized Intermittent Mandatory Ventilation–Pressure
Control (SIMV-PC) - A5 Only
FIGURE 5-15 Synchronized Intermittent Mandatory Ventilation–Pressure Control (SIMV-PC)
Tab
SIMV-PC is available on the A5 only. SIMV-PC means to deliver synchronized intermittent
mandatory pressure controlled ventilation to the patient. In the SIMV-PC mode, the ventilator
waits for patient’s next inspiration based on the specified time interval. The sensitivity depends
on Trigger. If Trigger is reached within the trigger waiting time (called synchronous trigger
window), the ventilator delivers pressure controlled ventilation synchronously with the preset
inspiratory pressure and inspiratory time. If the patient does not inspire within the trigger
window, the ventilator delivers pressure controlled ventilation to the patient at the end of trigger
window. Spontaneous breathing outside trigger window can acquire pressure support.
5.6.9.4 To Set SIMV-VC or SIMV-PC Mode
1. Select the SIMV-VC tab or SIMV-PC tab on the Main Screen.
2. Check that all SIMV-VC or SIMV-PC parameters are set appropriately.
If necessary, select the parameter softkey to edit the parameters settings (see FIGURE 5-15).
You can use the digital keyboard on the screen to enter the desired value, or continuously
press the or buttons to rapidly increase or decrease the parameter values.
3. Select the Set Mode softkey to confirm.
SIMV-VC parameters:
• Vt: Tidal volume (mL)
• Rate: Breath rate (bpm)
• Tinsp: Time of inspiration (sec)
NOTE: The screen displays the calculated I:E ratio based on Rate and Tinsp
when adjusting the Tinsp (software bundle version 02.06.00 and later).
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