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Old 03-28-2012
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Lungs Positive end expiratory pressure

Hi
Can someone explain in detail the positive end expiratory pressure? It's sort of confusing me. If the more negative intrapleural pressure helps to expand lungs then how does applying a positive pressure at the end of expiration help in keeping the small alveoli open? I think I'm getting the concept mixed up somewhere ...
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Old 03-28-2012
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alveolar pressure needs to be atleast 0 (intrapleural pressure of -5) or else the alveoli will collapse
so i think the whole point of applying postive pressure is simply to keep it at/above zero to prevent collapse.
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Quote:
Originally Posted by Dr.NickRiviera View Post
alveolar pressure needs to be atleast 0 (intrapleural pressure of -5) or else the alveoli will collapse
so i think the whole point of applying postive pressure is simply to keep it at/above zero to prevent collapse.
Oh ok. So its actually applying the positive pressure to the alveolar pressure then and not the intrapleural pressure ?
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Originally Posted by Hope2Pass View Post
Oh ok. So its actually applying the positive pressure to the alveolar pressure then and not the intrapleural pressure ?
yepp, exactly
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Old 03-28-2012
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positive pressure applied by the surfactant to inside the small alveoli , that is different from intrapleural pressure which must be negative in inspiration and 0 or positive in expiration
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PEEP =)

Designed to keep alveoli inflated all the time to prevent their collapse
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