Figure 5
From: Bench-to-bedside review: An approach to hemodynamic monitoring - Guyton at the bedside
Inspiratory variations in central venous pressure predict response of cardiac output to a volume infusion. Patients who have an inspiratory (insp.) fall in central venous pressure (CVP) (left side) can have an increase in cardiac output (Q) with a volume infusion, but not always because it depends how close to the plateau of the cardiac function the venous return intersects. Patients who do not have an inspiratory fall in CVP are unlikely to respond to a volume infusion because this indicates that the venous return curve is intersecting the flat part of the cardiac function curve. Pra, right atrial pressure.