A5/A3™ Operating Instructions 046-003777-00 5 - 15
Operations Ventilation Modes
2. Check that all VCV parameters are set appropriately.
If necessary, select the parameter softkey to edit the parameters settings (see FIGURE 5-12).
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.
VCV parameters:
• Vt: Tidal volume (mL)
• Rate: Breath rate (bpm)
• I:E: Ratio of inspiratory time to expiratory time
NOTE: The screen displays the calculated Tinsp when adjusting the I:E ratio
(software bundle version 02.06.00 and later).
• Tpause: Percentage of inspiratory plateau time in inspiratory time (%)
• PEEP: Positive end-expiratory pressure (cmH
2
O)
• Plimit: Pressure limit level (cmH
2
O)
NOTE: Before activating a new mechanical ventilation mode, ensure that all
related parameters are set appropriately.
5.6.8 Pressure Control Ventilation (PCV)
Pressure control ventilation (PCV) mode is a basic fully-mechanical ventilation mode. In the PCV
mode, each time mechanical ventilation starts, PAW rises rapidly to the preset Pinsp. Then gas
flow slows down through the feedback system to keep PAW constant until expiration starts at the
end of inspiration. The tidal volume delivered in the PCV mode changes based on patient
pulmonary compliance and airway resistance.
In the PCV mode, you can set PEEP to improve expiration of end-tidal carbon dioxide and to
increase oxygenation of breathing process.
For the A5, in PCV mode, Tidal Volume Guarantee (VtG) can be enabled with the VtG setting.
When VtG is a value, then Pinsp is disabled. The ventilator attempts to deliver the set VtG while
maintaining the PAW at or below PlimVG. When VtG is Off, PlimVG is disabled and Pinsp is
enabled. Changing the value of Pinsp will automatically set PlimVG to the same value, but PlimVG
can be adjusted without affecting the value of Pinsp.
NOTE: In PCV mode, even when the PlimVG or Pinsp parameters are inactive,
they are restricted to the parameter relationship equations
PlimVG≥PEEP+5 and Pinsp≥PEEP+5.
See sectionC.9 (page C-15)
"Ventilation Parameter Relationships".
FIGURE 5-13 Pressure Control Ventilation Tab
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