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  1. #1
    IMG SURVIVOR's Avatar
    IMG SURVIVOR is offline Moderator 536 points
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    Another V/Q question

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    Now you have a patient with an embolism occluding his pulmonary artery, so tell me

    what is going to be his V/Q ratio?















    In a blood flow obstruction the V/Q will be infinite, NO gas exchange in a lung that is ventilated but not perfused
    Moderator: USMLE AND Residency Forums.

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    why even bother with the obvious. Just know where you are need it and where you can help the most.

  2. #2
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    elektra is offline Member 510 points
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    Yes you are right!!!

    In an embolism of the pulmonary artery there is a decrease of perfusion wich is the denominator of the formula V/Q so the ratio will iincrease
    mmm....and Let me see,
    Ventilation with no blood flow, looks like a dead space to me!! what do U think?

    Yes it acts like a dead space because there is enough air but no blood flow exctaly the same that happend at alveolar dead space
    Last edited by elektra; 04-04-2006 at 03:09 PM.
    Elektra

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    md90's Avatar
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    what happens if it's an airway obstruction?

    What happens if it's an airway obstruction?

    V/Q would be close to or approaching zero; and it is most likely due to a shunt.

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    lovetiesto is offline Newbie 510 points
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    also, during increasing V/Q ratio think about it that ur at apex of lung(high ratio= high lung ie Apex, low ratio= low lung i.e. Base).

    @ Apex w/ high V/Q ratio(overventilated), high Po2, high pH(this means low PC02)
    @ Base lung low V/Q(underventilated), low po2, low pH(high Pco2)

    just easier to remember....

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