Body surface area, cardiac index, pump flow, oxygen delivery and consumption, hematocrit on bypass, and dilution formulas used by perfusionists.
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- What is the DuBois and DuBois formula for calculating body surface area (BSA)?
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BSA (m2) = 0.007184 x height(cm)^0.725 x weight(kg)^0.425- Formula for cardiac index (CI)
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CI = Cardiac output (CO) divided by body surface area (BSA)- Normal resting cardiac index in an adult
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About 2.4 to 4.0 L/min/m2- Formula for cardiac output (CO) from stroke volume and heart rate
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CO = Stroke volume x Heart rate- Normal resting cardiac output in an average adult
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About 4 to 6 L/min- How is a patient's target pump flow (L/min) calculated for cardiopulmonary bypass?
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Target pump flow = desired cardiac index x body surface area (BSA)- Standard full-flow cardiopulmonary bypass pump index targets about ____ L/min/m2.
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2.2 to 2.4- Formula for stroke volume (SV) from cardiac output and heart rate
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SV (mL) = (CO divided by HR) x 1000- The Fick principle states that cardiac output equals oxygen consumption divided by the ____.
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arteriovenous oxygen content difference- Formula for arterial oxygen content (CaO2)
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CaO2 = (Hgb x 1.34 x SaO2) + (PaO2 x 0.003)- Formula for venous oxygen content (CvO2)
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CvO2 = (Hgb x 1.34 x SvO2) + (PvO2 x 0.003)- Formula for total oxygen delivery (DO2)
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DO2 = Cardiac output x CaO2 x 10- Formula for oxygen consumption (VO2) by the Fick method
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VO2 = Cardiac output x (CaO2 minus CvO2) x 10- Normal resting whole-body oxygen consumption (VO2) in an adult
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About 200 to 250 mL O2 per minute- Formula for the oxygen extraction ratio
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O2 extraction ratio = VO2 divided by DO2
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