What is the cardiac output when oxygen (O2) consumption = 200 mL/min, arterial O2 content = 21 vol%, and mixed venous O2 content = 15 vol%?
a. 3.3 mL/min c. 5.3 mL/min
b. 4.3 mL/min d. 6.3 mL/min
ANS: A
Cardiac output = oxygen consumption ÷ (arterial O2 content – mixed venous O2 content). 21 vol% = 21 mL/100 mL and 15 vol% = 15 mL/100 mL. Therefore, 200 mL/min ÷ (21 mL/100 mL – 15 mL/100 mL) 10 = 3.3 mL/min.
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