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A 77yo woman suffered diarrhea 4 days ago. What would be her blood gas result?

waelhammad
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2022-10-30
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A 77yo woman suffered diarrhea 4 days ago. What would be her blood gas result?

  1. pH =7.2, PaCO2 =8
  2. pH =7.4, PaCO2 =1.5
  3. pH =7.4, PaCO2 =2.6
  4. pH =7.4, PaCO2 =2.8
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waelhammad
2022-10-30
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The key is B. pH = 7.4, PaCO2 = 1.5 [Diarrhoea causes metabolic acidosis and in response there occurs respiratory compensation [hyperventilation] leading to respiratory alkalosis and low PaCO2 (due to CO2 washout)].

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