To expand or contract lungs and chest wall P w is the pressure across the chest wall. Note: has to keep pressure just slightly negative at all times (P L is also commonly represented by the symbol P TP.) The pressure difference that maintains alveolar inflation. The pressure difference between the alveoli and the pleural space, as shown in the following equation: The transpulmonary pressure gradient, or P L, equals The difference in pressure between the atmosphere (body surface) and the alveoli: The trans-respiratory pressure gradient (P rs) represents P pl also varies during the breathing cycle. Negative (i.e., subatmospheric) during quiet breathing. Pleural pressure (P pl) in the fluid of the pleural space is usually Expiration is normally a passive maneuver.Īlveolar pressure (P alv), often referred to as Work is minimal and performed during the inspiratory phase.
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