Fig. 2
From: Venous return and mean systemic filling pressure: physiology and clinical applications
Overlaying of cardiac function curve and venous return curve. The venous return curve (in blue) indicates that venous return decreases when right atrial pressure (RAP) increases. Mean systemic filling pressure (Pmsf) is the pressure at the x-intercept of the venous return curve. Resistance to venous return (RVr) is represented by the inverse of the slope. At the intersection of the venous return curve and the cardiac function curve (in red) stands the point of equilibrium, whose coordinates reflect the haemodynamic conditions