Transpulmonary Pressure: Difference in Pressure between Inside/Outside Lungs
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Inside: $P_A$, Outside: $P_{ip}$ (Intrapleural Fluid)
Pressure Difference Holding Lungs Open (Opposes Inward Elastic Recoil)
0 - (-4) = 4mmHg
Other Transmural Pressures (2)
Trans-Respiratory (Bulkflow) Pressure Difference across entire Respiratory System
Trans-Chestwall
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Pressure Difference holding Chest Wall Inwards (Opposes Outward Elastic Recoil)
Inspiration in Pressures