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Old 01-11-2013
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Lungs Concepts behind PEEP

Hi friends

I can't understand the real concepts behind PEEP, so plz can anyone explain it to me.
Thanks
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Old 01-12-2013
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I want to try but not sure if its accurate;

At inspiration,a negative(-1)alveolar pressure is needed for air to move from 0mmgh atmospheric into the alveoli.

But a positive(+1)pressure is needed for expiration.without this positive pressure ,air is trapped.

PEEP helps create this positive pressure hence PEEP
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Old 01-12-2013
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PEEP keeps the alveoli open at the end of expiration when (normally) the pressure becomes negative. Normally, the surfactant keeps the alveoli open but in ARDS (classically) the surfactant is low/deficient which leads to collapse of the alveoli leading to atalatasis and, therefore, right to left pulmonary shunt--> Low PaO2.
PEEP provides positive end expiratory pressure keeping the alveoli open thereby preventing above mentoned problems and allowing more oxygenation thereby increasing PaO2.
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Old 01-12-2013
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Nice thanks friends

Ok.. one more question, what are the differences between PEEP and CPAP?

Last edited by heartbeat; 01-12-2013 at 10:45 PM.
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Old 02-07-2013
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Quote:
Originally Posted by heartbeat View Post
Nice thanks friends

Ok.. one more question, what are the differences between PEEP and CPAP?
Continuous positive airway pressure (CPAP) is the use of continuous positive pressure to maintain a continuous level of positive airway pressure. It is functionally similar to positive end-expiratory pressure (PEEP), except that PEEP is an applied pressure against exhalation and CPAP is a pressure applied by a constant flow.
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Old 02-07-2013
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Quote:
Originally Posted by Novobiocin View Post
Continuous positive airway pressure (CPAP) is the use of continuous positive pressure to maintain a continuous level of positive airway pressure. It is functionally similar to positive end-expiratory pressure (PEEP), except that PEEP is an applied pressure against exhalation and CPAP is a pressure applied by a constant flow.
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