Figure 4.

A pump function graph demonstrating mean right ventricular pressure as a function of stroke volume (SV). Maximum mean right ventricular pressure is calculated from nonlinear extrapolations of early and late systolic portions of the right ventricular pressure curve. SV is calculated by dividing cardiac output by heart rate. The curve is a parabolic fit of two data points: maximum mean right ventricular pressure and measured mean right ventricular pressure/SV. At high right ventricular pressure, a small decrease in pressure results in a large increase in SV. PVR: pulmonary vascular resistance. Reproduced from [2] with permission from the publisher.