Accepted
at 3:35 a.m. Feb, 26, 2026
by
braviboron
Author:
kyle.robinson
Co-authors:
braviboron
Type of change:
Updated content
Rationale for change
times by 1.25 makes for easier mental maths than divide by 0.8
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What is the alveolar gas equation, and what does it commonly simplify to at sea level for most patients?
\[{{c1::\begin{align*}P_{\text{A} }\ce{O2} &= \left( \underset{\substack{\text{Fractional concentration}\\\text{of inspired } \ce{O2} } } {F_{\text{I} }\ce{O2} } \; \times \left( \underset{\substack{\text{Total pressure}\\\text{of inspired air} } } {P_{\text{I} } } - \underset{\substack{\text{Partial pressure}\\\text{of water vapour} } } {P_{\ce{H2O} } } \right) \right) - \left( \underset{\substack{\text{Arterial } \ce{CO2}\\\text{tension} } } {P_{\text{a} }\ce{CO2} } \Big/ \underset{\substack{\text{Respiratory}\\\text{Quotient} } } {\text{RQ} } \right) \\
&\approx F_\text{I}\ce{O2}\times\left[760-47\right]-\left(\frac{P_\text{a}\ce{CO2} }{0.8}\right)
\end{align*} }}\]
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Missed Questions
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eTG Complete
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Talley & O'Connor
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Additional Resources
https://junior-doctor-notes.netlify.app/01-Disciplines/Respiratory/Investigations/Blood-Gas-Interpretation
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Source
One by one
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