4-6
To ensure the set tidal volume gas delivery, the ventilator adjusts gas flow based on the
measured inspiratory volume, dynamically compensates for the loss of tidal volume arising
from breathing system compliance and system leakage and eliminates the effect of fresh gas
as well. This is called tidal volume compensation.
In the VCV mode, if tidal volume compensation is turned off or failed, the anesthesia
machine can continue delivering gas stably but cannot compensate for the effects of fresh gas
flow and breathing system compliance losses.
4.4.3.2 Waveforms
The following figures show the Paw waveform and flow waveform in the VCV mode.
Generally, in the VCV mode, the flow waveform is at a constant flow during inspiration and
the Paw waveform rises in the same period.
4.4.3.3 Start VCV Mode
1. Select the [Vent Mode] shortcut key to open the [Vent Mode Setup] menu.
2. Select [VCV] in the [Vent Mode Setup] menu.
3. After confirming the selection, the[TV] shortcut key (the first key from the left in the
parameter setup shortcut keys area) is highlighted.
4. Make sure that TV is appropriately set for the patient. Push the control knob to confirm
the setting so as to start VCV mode.
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