Which channel of the PAC should be selected to draw blood from if a mixed venous sample is required?

Question

Quizplus · Accepted Answer

Because oxygen contents of superior and inferior vena cava venous blood may differ considerably, proximal channel blood is not a clinically acceptable mixed venous blood sample for purposes of measuring the body's average venous oxygen content. A thoroughly mixed venous blood sample reflecting the true average of the body's venous oxygen content must be obtained from the pulmonary artery, through the catheter's distal channel.

Which Channel of the PAC Should Be Selected to Draw