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4. A patient with normal lungs but a right-to-left shunt is found atcatheterization to have oxygen concentrations in his arterial and mixedvenous blood of 18 ml·100 ml−1 and 14 ml·100 ml−1, respectively. If theO2 concentration of the blood leaving the pulmonary capillaries is calcu-lated to be 20 ml·100 ml−1, what is his shunt as a percentage of his cardiacoutput?A. 23B. 33C. 43D. 53E. 63

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