Pneumothorax
Pathophysiology• Abnormal presence of air within the pleural cavity.• Lung compression reduces lung compliance, volumes, and diffusion capacity.• Tension Pneumothorax:-If left untreated, air can accumulate without decompressing adequately, leading to high positive pleural pressures, causing severe lung collapse, and compression of the mediastinum, great vessels, and heart, and ultimately hemodynamic compromise secondary to decreased venous return. -Patients in tension pneumothorax require immediate needle decompression in the second intercostal space at the mid-clavicular line, followed by tube thoracostomy.
Mechanism• Abnormal communication between the pleural cavity and either the alveoli or airways cause the air to flow into the