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ventilation/flow ratio imbalance caused by ARDS or COPD. Even when the
respiratory line leaks, it can also ensure the supply of tidal volume. PCV shall be
used when the gas line leaks.
Typical pressure waveform of PCV is as follows:
Fig. 35 PCV typical pressure waveform
7.6.4 V-A/C and P-A/C
• V-A/C
V-A/C is a volume-controlled ventilation mode based on VCV and supports
synchronous triggering during the expiratory stage. When the trigger pressure/flow
rate meets the trigger conditions, the ventilator provides once VCV ventilation with
fixed tidal volume in advance.
The typical pressure waveform of V-A/C is shown below:
Fig. 36 V-A/C typical pressure waveform
•
P-A/C
P-A/C is a pressure-controlled ventilation mode based on PCV and supports
synchronous triggering during the expiratory stage. When the trigger pressure/flow
rate meets the trigger conditions, the ventilator provides once PCV ventilation with
fixed inspiratory pressure in advance.
The typical pressure waveform of P-A/C is shown below:
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