Thursday, July 2 (2020); Cardiovascular system
Venous return is the rate of blood flow into the heart from the veins. At a steady state, venous return and cardiac output are equal. Venous return can be expressed as VR = (MSFP - RAP) / VR, where MSFP is mean systemic filling pressure, RAP is right atrial pressure and VR is the venous resistance. Factors which influence venous return include total venous blood volume, venous smooth muscle tone, right atrial and pericardial properties, blood viscosity, vasoactive drugs and autonmic tone.