Tips – Traquea

It is physiologically important to note that the upper part of the trachea
is extrathoracic, whereas the lower half is intrathoracic. This relationship
creates different behaviors during inspiration and expiration. The
extrathoracic trachea, which is subject to the effects of ambient atmospheric
pressure, decreases slightly in caliber during inspiration and
increases during expiration. By contrast, the intrathoracic trachea undergoes
expansion during inspiration as a result of negative intrathoracic
pressure transmitted from the pleural cavity. During expiration,
however, surrounding pleural pressure diminishes the tracheal caliber,
which may be exaggerated in the setting of marked increased expiratory
effort in airway obstruction.


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