Through which pulmonary artery catheter port would you obtain a mixed venous blood sample?

a. Proximal (right atrium) port
b. Catheter thermistor connector
c. Distal (catheter tip) port
d. Balloon inflation port

ANS: C
First, ensure that the balloon is deflated and prepare to draw the sample directly from the cathe-ter's distal port (no three-way stopcock).

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