NBME 20 Decreased arterial Pco2 (NBME Answers)

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Retired NBME 20 Answers

nbme20/Block 2/Question#24 (reveal difficulty score)
A patient with a 1-week history of diarrhea ...
Decreased arterial Pco2 🔍 / 📺 / 🌳 / 📖
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submitted by ∗hayayah(1212)

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Patient has chronic diarrhea leading to metabolic acidosis. Respiratory compensation will lead to decreased CO2 (respiratory alkalosis via hyperventilation).

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usmleuser007 Aldo would increase b/c protons are anti-transported with potassium --> leads to hyperkalemia --> aldo activation ADH will also increase b/e of volume loss +3

athenathefirst Can't believe how easy and I still got it wrong +

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submitted by loopers(13)

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Another quick way to think of this is through the formula: pH = HCO3/CO2. Since pH is low and HCO3 is low, CO2 must also be low.

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bfinard1 Yes, check out this youtube for further explaination: https://www.youtube.com/watch?v=J9jisOXB_Oo&ab_channel=DirtyMedicine +1

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