Although it fluctuates during inspiration and expiration, intrapleural pressure remains approximately –4 mm Hg throughout the breathing cycle.Ĭompeting forces within the thorax cause the formation of the negative intrapleural pressure. However, due to certain characteristics of the lungs, the intrapleural pressure is always lower than, or negative to, the intra-alveolar pressure (and therefore also to atmospheric pressure). Similar to intra-alveolar pressure, intrapleural pressure also changes during the different phases of breathing. Intrapleural pressure is the pressure of the air within the pleural cavity, between the visceral and parietal pleurae. It equalizes at 760 mm Hg but does not remain at 760 mm Hg.
Alveolar pressure changes during the different phases of the cycle. \): Intrapulmonary and Intrapleural Pressure Relationships.
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