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Old 08-08-2013
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Default Pulmonary edema shunt or V/Q mismatch?

in UW .. they say that pulmonary edema is a V/Q mismatch and it responds to 100% o2 but ARDS is a form of shunting does not respond to o2 .... isn't ARDS a form of non-cardiogenic P.edema .... I am confused here plz help !!
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Old 08-08-2013
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ARDS you damage those alveoli, that diffusion barrier is gone. so it becomes a shunt (area of ventilation that receives no perfusion).

this shunt will not respond to 02 because the diffusion barrier is gone.
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Old 08-09-2013
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i dont get this criteria for ARDS is Pao2/ Fio2 < 200
can somebody explain this please
and whats this ratio supposed to be in a normal person
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