4-14
Principles of operation
setting. If the patient fails to trigger a breath within the interval determined by
the Rate control, the ventilator triggers a Timed (backup) breath with the set
I-Time, Rise, and IPAP settings.
The control settings active in the PPV mode are shown in Figure 4-14.
Figure 4-14: PPV controls
Figure 4-15 shows PPV mode waveforms. Note how volume and pressure
increase as does the ventilatory demand of the patient. Max V (PPV maximum
volume limit) and Max P (PPV maximum pressure limit) are used to prevent
the delivery of excessive pressure or volume. More information about these
limits is provided in “About Max V and Max P alarms and alarm limits” on
page 6-7.
Figure 4-15: PPV waveforms
VolumeFlowPressure
Max V
Increase in patient demand
Time
Max P
EPAP
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