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Why is there a difference between you measured ETCO2 and PaCO2?

Anaesthesia Coffee Break

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What's the Relationship Between Arterial CO2 and Whole CO2?

The relationship between arterial CO2 and entire CO2 is best described by the Bohr equation. There's a whole derivation of it in West but we won't need to go into that today. So obviously there's absolutely no difference, if you look at this equation, if there's no difference between your arterial and your n-tidal PCO2, there's no alveolar dead space. And so roughly, I mean you get different values for this obviously but I think the one quote is roughly about 0.2 or 1.3.

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