A left-to-right cardiac shunt, due to a leak in the septum wall of the heart, would be best indicated by an increase
A. in PCWP
B. in mixed venous oxygen saturation
C. in mPAP
D. in arterial to venous oxygen content difference
Answer: B. A left-to-right cardiac shunt would best be observed by examining the oxygen saturation of mixed venous blood.
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