More on Blood Gases
Why does PaO2 rise as PaCO2 falls?
Answer
There is more ‘space’ in the alveoli – as described in the alveolar gas equation.
Write down the alveolar gas equation.
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More on Blood Gases
Why does PaO2 rise as PaCO2 falls?
Answer
There is more ‘space’ in the alveoli – as described in the alveolar gas equation.
Write down the alveolar gas equation.
Answer
The Alveolar Gas Equation:
PAO2 = PIO2 - (PaCO2/R)
PAO2 = Alveolar partial pressure of oxygen
PIO2 = Inspired partial pressure of oxygen
PaCO2 = Arterial partial pressure of carbon dioxide
R = Respiratory quotient