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Kaplan Qbank USMLE



Author6 Posts
  #1

pt having alveolar PCO2 40 mmHg ,begins to hyperventilate.If his alveolar ventilation quadruples and CO2 production remains constant ,what will be the alveolar PCO2 ?

  #2

:arrow: alveolar CO2 =10 since Pa CO2 = CO2 produced/ Alveolar ventilation .

  #3

smiling face

  #4

it is really problem . I can not understood this question at all please explain it in details.
Thank you

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Emily

  #5

10 mm hg..

  #6

If CO2 production did not increase, and only ventilation increased 4 times then alveolar CO2 must decrease by 4 times, cuz it is in equib with arteriolar CO2 which is being reduced by increased ventilation, leading to acute Resp Alk.

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