Cardiac output and left ventricular preload are important physiologic parameters because knowing them allows one, in actual clinical situations, to apply Starling’s law: an increase in
Bedside Hemodynamic Monitoring preload produces an increase in cardiac output at any given level of myocardial contractility. For instance, in a patient with a low cardiac output and a wedge pressure below normal, intravenous fluid would be expected to improve cardiac output.
Does the “wedge” really mean anything?
As improbable as it seems, the wedge pressure correlates nicely with left atrial pressure.