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  1. #1
    Unregistered Guest

    what kind of alkalosis

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    "gastroenteritis with nausea nad vomiting and is able to ingest only small amounts of water .After 3 days she developes light-headedness, especially when sitting or standing. pH=7.50.

    Arterial blood gas analysis is most likely to show which of the following sets of values ?"

    D: PCO2 30, HCO3- 22
    or
    E: PCO2 47, HCO3- 35

    ?

  2. #2
    AUCMD2006's Avatar
    AUCMD2006 is offline Ultimate Member 6129 points
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    D vomiting
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  3. #3
    DrR
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    Vomiting would make a metabolic alkalotic state. that means HCO3- higher than normal. Since it is 3 days by now, PCO2 will go up to compensate partially. E is the answer. please tell me if my reasoning is wrong.

  4. #4
    Unregistered Guest
    this one of the questions from the 2006 practice exam. They gave the answer as E. They gave no explanation.

    I don't understand why either.

  5. #5
    blrman76 is offline Newbie 510 points
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    Metabolic alkalosis

    Quote Originally Posted by Unregistered
    "gastroenteritis with nausea nad vomiting and is able to ingest only small amounts of water .After 3 days she developes light-headedness, especially when sitting or standing. pH=7.50.

    Arterial blood gas analysis is most likely to show which of the following sets of values ?"

    D: PCO2 30, HCO3- 22
    or
    E: PCO2 47, HCO3- 35

    ?
    The answer should be E i.e. metabolic alkalosis with respiratory compensation.

    Chronic vomiting causes loss of Hydrogen ions in the stomach acid. This will cause the alkalosis. There is respiratory compensation in form of hypoventilation in order to increase the amount of Hydrogen ions in blood.

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