This pressure time graph is seen which mode of ventilation:-

In this graph constant Pressure is achieved which is seen in Pressure Control Ventilation. The major benefit of PCV is ability to control peak alveolar pressure which is a pressure most closely related to alveolar distention and injury, Thus PCV is protecting alveoli from overdistension. 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). Volume - controlled ventilation, where the inflation volume is preselected, and the ventilator automatically adjusts the inflation pressure to deliver the desired volume. the rate of lung inflation can be constant or decelerating. Modes of ventilation Control mode ventilation (CMV) Pressure control ventilation (PCV) Pure control modes (all breath is supplied by Ventilator, breath is not taken by the patient) Synchronized intermittent minute ventilation (SIMV) breath can be supplied by the Ventilator and can be taken by the patient Pressure suppo ventilation (PSV) Continuous positive airway pressure (CPAP) Pure spontaneous mode (in which all the breath has to be taken by the patient)