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Old 09-13-2012
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Question why respiratory alkalosis ?

what is the cause of respiratory alkalosis in pulmonary embolism and ARDS...i mean the mechanism behind it....i'm unable to reach that deep with this topic please help me out with this guys...?

i first got doubt abt emphysema but got cleared now that it maintains alveolar ventilation....resp. alkalosis...is that the same thing happens here? help me.
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Old 09-13-2012
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In pulmonary embloism n ards to maintain pao2 >> hyperventilation >> co2 washout and therefore respiratory alkalosis......
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Old 09-13-2012
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it has to be compensatory hyperventilation.............thats the only thing i can think of
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thanks both of you.....ya for compensation respiratory alkalosis is seen...but how lungs can hyperventilate when obstructed with embolus or hyaline membrane......???.... i think i'm missing a basic here,unable to think it as logic too
correct me if i'm wrong

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Old 09-13-2012
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All these compensatory changes that we are talking about are when the patient is alive ... ie he doesnt have a severe disease and is not dead..

If the embolus blocks the totatl pulmonary circulation 100% then patient is dead ... no more compensatory mechanisms..... similarly if the hyaline membranes cover 100% of lung preventing any ventilation from occuring then the patient is dead..
So when we talk about compensatory mechanisms , that means there is a partial block by embolus or hyaline membranes leaving some parts of the lungs to work n compensate for the isssues...

I hope thats clear ...
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