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CHEST WALL COMPLIANCE - CHEST WALL COMPLIANCE Changes in...

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CHEST WALL COMPLIANCE: Changes in chest wall compliance are less common than changes in the lung compliance: (1) pathologic situations preventing the normal movement of the rib cage, such as, distortion of the spinal column, (2) pathologic (cancer) or physiologic (pregnancy) reasons increasing the intra abdominal pressure, (3) stiff chest, such as broken ribs. SURFACE TENSION: A thin film of liquid lines the alveoli and the surface tension of this film is another important factor in the pressure-volume relationship of the lung. The surface tension arises because the attractive forces between adjacent molecules of the liquid are much stronger than those of between the liquid and the gas. As a result of that the liquid surface area becomes as small as possible. At the interface between the liquid and the alveolar gas, intermolecular forces in the liquid tend to cause the area of the lining to shrink (the alveoli tend to get smaller). The surface tension contributes
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