Relative circulation pressures in a patient post-Fontan operation compared to a healthy individual with biventricular heart

This graphic demonstrates the relative circulation pressures in a normal biventricular heart (solid line) and a patient with a Fontan operation (dashed line). In both situations, the systemic and pulmonary circulations are connected in series. The primary difference seen at rest is in the central venous pressure. Without a ventricle pumping blood from the systemic veins to the lungs, the central venous pressure remains elevated.