1

Why does venous PO2 decrease in anemic hypoxia? Shouldn't it be constant as PO2 is a measure of the dissolved oxygen?

-1

Assuming oxygen consumption remains constant, getting the same amount of O2 from less haemoglobin drops the venous spO2 even further than usual. O2 attached to Hb and dissolved in water are in equilibrium, so lower spO2 = lower pO2.

This principle is sometimes used in critical illness, where mixed venous spO2 from the pulmonary artery is compared to arterial spO2 to give a measure of O2 extraction.

  • Welcome to Health.SE. Since health is an important topic, the site has a strict policy that all answers should be backed up with reliable references, in order to provide the community with the means to assess the merit of the answer, regardless of the reader's background. See this list of reliable sources. If you still have trouble with this, feel free to visit the help center. – Narusan Aug 2 '17 at 8:50

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.