Airway obstructions

In addition to the accumulation of bronchial secretions, other obstacles in the tracheobronchial tree (inhalation of foreign bodies) can cause atelectasis. Atelectasis by adsorption

In cases of incomplete bronchial obstruction, nitrogen in the inspired air tends to maintain alveolar stability. However, when high concentrations of oxygen are inspired, alveoli with a low ventilation-to-perfusion ratio can become unstable and collapse. In fact, since the total partial pressure in the alveolar gas is greater than that in the venous blood, the gas (rich in oxygen and poor in nitrogen) easily diffuses towards the venous blood and alveolar collapse rapidly occurs. Collapse is most likely to occur at the base of the lung where the parenchyma is less distended and the airways can be closed. However, this phenomenon of alveolar retention does not seem to be pathognomonic, as atelectasis by 'passive' compression also plays a role.

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