The Synapse Critical Care & Emergency Medicine Podcast

The Synapse Season 2 Episode 99 - The "Anti-Winters" Formula

Season 2 Episode 99

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Ok, we talked about Winters Formula for expected PaCO2 in metabolic acidosis...but what happens if our patient has the opposite issue, and is metabolic alkalosis instead? Is there a magical (albeit empirical) equation to help with PaCO2 prediction there too? Well, ask and thee shalt receiveth! There IS an equation, but it is the lesser-known (and un-named) cousin to Winters Formula. What is it, how do we use it, and what are the pitfalls? Glad you asked! Come join me and find out!


Expected PaCO2 = 0.7 x [HCO3] + 21     (+/- 1.5)