Figure 3
From: Clinical review: Biphasic positive airway pressure and airway pressure release ventilation
Spontaneous breathing during airway pressure release ventilation (APRV)/biphasic positive airway pressure (BiPAP) accounted for a decrease in blood flow to shunt units (ventilation/perfusion [VA/Q] < 0.005) and an increase in perfusion of normal VA/Q units (0.1 < VA/Q < 10), without creating low VA/Q areas (0.05 < VA/Q < 0.1). Pressure support ventilation had no effect on pulmonary blood flow distribution when compared with controlled mechanical ventilation (APRV/BiPAP without spontaneous breathing).