I am in the midst of preparing for my exams.
I can't understand what is the difference between PO2 and Pa02.
I know that PaO2 is the partial pressure of oxygen in blood.
PO2 is partial pressure of Oxygen.
Are they interchangeable?
For example in many textbooks (and websites) i have read, about the oxygen dissocation curve,
the x-axis is PO2.
In the discussion, they state "it describes the relationship bettwen the sat of Hb and the patrial pressure of (PO2) in the blood. Due to the shape of the curve, a small drop in PaO2 below 8kPa will cause a marked fall in SaO2."
In the same paragraph, they made reference to both PO2 and PaO2.
I am so confused.
Thank you very much.