Set Ventilation Operations
6 - 14 Operator’s Manual of Anesthesia System
6.6.9 Set Airway Pressure Release Ventilation (APRV) (Optional)
The APRV mode refers to the Airway Pressure Release Ventilation mode, which can be regarded as the
CPAP mode with periodical and transient airway pressure release. APRV applies a continuous positive
air way pressure in conjunction with an inverse I:E ratio to assist in maintaining lung inflation may
provide benefits to difficult to oxygente patients.
Switchover between high pressure phase and low pressure phase is based on Tlow and Thigh in
APRV mode.
Continuous pressure is allowed in both high pressure phase and low pressure phase.
Figure 6-11 Airway Pressure Release Ventilation tab
Set APRV Mode:
1. Select the APRV tab on the Main Screen.
2. Select the parameter soft key and assign an appropriate value on the pop-up screen.
3. Check that all APRV parameters are set appropriately.
4. Select the [Set Mode] soft key to confirm the settings.
APRV parameters:
• Phigh: high pressure level
• Plow: low pressure level
• Thigh: high pressure time
• Tlow: low pressure time
• Tslope: rise time
NOTE: Before activating a new automatic ventilation mode, ensure that all
related parameters are set appropriately.
6.6.10 Lung Recruitment Ventilation (Optional)
Lung recruitment is a lung-protective ventilation strategy. The ventilator intermittently supplies gases
of a pressure higher than the mean airway pressure, and sustains the pressure for a period of time
during the automatic ventilation. In this way, the lung recruitment maneuvers open more collapsed
pulmonary alveoli and prevent the secondary pulmonary atelectasis caused by the low tidal volumes
ventilation.
For the safety of the ventilation and observing the effect of the lung recruitment ventilation, the
anesthesia system needs to perform real-time monitoring over PEAK, PEEP, C, and Vte during the lung
recruitment ventilation.
NOTE: Recruitment can only be used in automatic ventilation modes.
NOTE: Generally, 100% O
2
or high-concentration O
2
is used for ventilation
during lung recruitment.
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