Figure 3From: Pavane for a pulse pressure variation defunctDifference between mean systemic filling and right atrial pressure correlates with venous return. With increasing pleural pressure (Ppl) during inspiration, right atrial pressure (RAP) increases, diminishing the difference between mean systemic filling and right atrial pressure (Pms – RAP). CO/Q, increase in cardiac output; VR, venous return.Back to article page