All true about pressure control ventilation except-
The desired inflation pressure is preselected
There is accelerating flow rate
Tidal volume can be variable
Alveolar pressure is fixed
With pressure control ventilation (PCV), the desired inflation pressure is preselected, and a decelerating inspiratory flow rate provides high flows at the onset of the lung inflation, to attain the desired inflation pressure quickly. Pressure control modes of ventilation In a pressure controlled mode of ventilation, the inspiratory pressure is the control variable, and is maintained during the inspiratory phase. As a result of this, the pressure waveform is "square". This increases the mean airway pressure (i.e. the area under the pressure/time graph is greater). During the early inspiratory phase, the ventilator provides a high inspiratory flow rate to rapidly achieve the pressure limit variable ("PC above PEEP" on a SERVO-i). In order to maintain this pressure, the flow rate needs to decrease over the course of inspiration, and it generally takes the shape of a downsloping ramp. During the early inspiratory phase, the ventilator provides a high inspiratory flow rate to rapidly achieve the pressure limit variable . In order to maintain this pressure, the flow rate needs to decrease over the course of inspiration, and it generally takes the shape of a downsloping ramp.
Modes of Ventilation