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Old 03-15-2012
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Lungs The concept of airway pressure

I am confused about this : when it says positive airway pressure in inspiration is that mean pressure of inspired air on the airways or pressure of the airways on entering(inspired )air????
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Old 03-15-2012
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i would assume air pressure because airway pressure should be negative for the air to go inside
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Old 03-15-2012
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Quote:
Originally Posted by flowerlady View Post
I am confused about this : when it says positive airway pressure in inspiration is that mean pressure of inspired air on the airways or pressure of the airways on entering(inspired )air????
Positive airway pressure is needed at the end of expiration so that your alveoli do not collapse. That is why some one who has obstructive lung disease need to be placed on positive ventilators to keep their airways open during expiration since they no longer have the elastic recoil property to keep it open.
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Originally Posted by gear2d View Post
Positive airway pressure is needed at the end of expiration so that your alveoli do not collapse. That is why some one who has obstructive lung disease need to be placed on positive ventilators to keep their airways open during expiration since they no longer have the elastic recoil property to keep it open.
thanks but

you are talking about lung and chest wall , I am asking about airways
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Quote:
Originally Posted by flowerlady View Post
thanks but

you are talking about lung and chest wall , I am asking about airways
i think is (+) preasure in your airways because its must fight against the (-) preasure in the pleurar cavity
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Its pressure of inpired air in airways which should be greater than capillary pressure for (consider it partial pressure if only one gas considered) gas exchange.
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Last edited by Kabutar111; 03-15-2012 at 09:55 PM. Reason: Sorry for typo above
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