Cardiac output and left ventricular preload are important physiologic parameters because knowing them allows one, in actual clinical situations, to apply Starlingâ€™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 â€œwedgeâ€ really mean anything?
As improbable as it seems, the wedge pressure correlates nicely with left atrial pressure.