The Pressure that is responsible for distending the lungs is Alveolar Pressure
Elastic recoil forces of chest wall pulling out and lungs pulling in are opposed by the surface tension of the water in the intraplural space, which is called the pleural pressure
A 19 yr old male arrives at the ED with a knife wound to the chest. All of the following are true except
Alveolar pressure = 0
Pleural pressure < 0
Lung volume is decreased
Lung compliance
Tells you how easy it will be to inflate the lung
Static compliance is measured with NO air flow
Dynamic compliance is measured DURING air flow
Specific compliance = Compliance/FRC
Elastance = deltaP/delta V
All of the above are correct
None of the above are correct
High compliance
Easier to inflate
Harder to deflate
emphysema has increase compliance of the lung
Fibrosis of lung causes increase in Elastance
All are correct
Static Compliance Graph (P-V) of respiratory system
This graph is depicting the relationship between transmural pressure and lung volume. The trasmural pressure is the result of opposing recoil of the chest wall (green line) and lung (red line), thus trasmural pressure is the black line
At TLC transmural pressure is very high (-30cmH2O)
At 70% TLC the transmural pressure is = lung's recoil pressure
At FRC lung's recoil pressure = recoil pressure of chest wall so transmural pressure = 0
At RV Transmural is positive and lungs are non compliant
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