Cardiac Formulas
Mean arterial pressure
Mean arterial pressure (MAP) [1, 2] = [systolic blood pressure + (2 X diastolic blood pressure)] / 3
The reference range is 70-100 mm Hg.
Cardiac index
Cardiac index = cardiac output / body surface area
The reference range is 2.5-4 L/min/m2.
Stroke volume
Stroke volume [3] = cardiac output / heart rate
The reference range is 60-120 mL/beat. [4]
Systemic vascular resistance
Systemic vascular resistance = (mean arterial pressure – mean right atrial pressure) x 80 / cardiac output
The reference range is 800-1200 dynes X sec/cm3.
Pulmonary vascular resistance
Pulmonary vascular resistance = (mean pulmonary artery pressure – mean pulmonary capillary wedge pressure) X 80 / cardiac output
The reference range is 125-250 dynes X sec/cm3.
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