Why do transcutaneous oxygen tension (PO₂) and carbon dioxide tension (PCO₂) values differ from PaO₂ and PaCO₂ measurements?
A) Because of the lag time between the cardiac output and the time the blood reaches the transcutaneous electrode site
B) Because the skin is much more permeable to oxygen than carbon dioxide
C) Because oxygen is consumed and carbon dioxide is produced in transit from the left ventricle to the electrode site
D) Because metabolism in the tissue consumes oxygen and produces carbon dioxide at the site of the electrode
Correct Answer:
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