A mixed venous blood sample obtained from a pulmonary artery catheter sample has a PO2 of 85 mm Hg and a hemoglobin saturation of 95%. Which of the following is likely?
1. The pulmonary artery catheter balloon was not deflated.
2. The sample was drawn from the proximal, not distal port.
3. The blood sample was withdrawn too quickly.
a. 1 and 2 only
b. 1 and 3 only
c. 2 and 3 only
d. 1, 2, and 3
ANS: B
If one fails to deflate the balloon before sampling or withdraw the sample too quickly, the ve-nous blood may be "contaminated" with that from the pulmonary capillaries. The result is always a falsely high oxygen level.
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