In the given DO2 calculation example, what is the cardiac output value (L/min)?

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Multiple Choice

In the given DO2 calculation example, what is the cardiac output value (L/min)?

The main idea here is how oxygen delivery to the tissues is determined by how much blood the heart pumps and how much oxygen each unit of arterial blood can carry. Oxygen delivery (DO2) is calculated as the product of cardiac output (CO) and arterial oxygen content (CaO2), with a conversion factor to keep units consistent: DO2 = CO × CaO2 × 10. To solve for cardiac output when DO2 and CaO2 are known, rearrange this to CO = DO2 ÷ (CaO2 × 10). In the given example, plugging the DO2 value and the CaO2 value into this rearranged formula gives 6 L/min, which aligns with a plausible resting cardiac output. This is why the 6 L/min choice is the best fit. If CaO2 were higher for the same DO2, CO would be lower, and if CaO2 were lower, CO would be higher, illustrating how these factors trade off in determining CO.

The main idea here is how oxygen delivery to the tissues is determined by how much blood the heart pumps and how much oxygen each unit of arterial blood can carry. Oxygen delivery (DO2) is calculated as the product of cardiac output (CO) and arterial oxygen content (CaO2), with a conversion factor to keep units consistent: DO2 = CO × CaO2 × 10. To solve for cardiac output when DO2 and CaO2 are known, rearrange this to CO = DO2 ÷ (CaO2 × 10). In the given example, plugging the DO2 value and the CaO2 value into this rearranged formula gives 6 L/min, which aligns with a plausible resting cardiac output. This is why the 6 L/min choice is the best fit. If CaO2 were higher for the same DO2, CO would be lower, and if CaO2 were lower, CO would be higher, illustrating how these factors trade off in determining CO.

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