Figure 1.
Pressure (longitudinal axis) and time (horizontal axis) curve in APRV. Two mandatory breaths (without SB, switched by time) and two intermittent mandatory breaths (with SB, triggered by flow or pressure, switched by both time and SB) are shown. Black arrows represent high pressure (Phigh), low pressure (Plow), and mean airway pressure (Pmean). Red arrow represents SB. Blue fontin the horizontal axis represents high pressure time (Thigh) and low-pressure time (Tlow).
APRV: Airway pressure release ventilation; SB: Spontaneous breathing.