Airway Conductance

The respiratory system comprises two sets of airways connected in series. The conducting airway begins at the nose and mouth and continues into the pharynx, larynx, epiglottis, vocal cords, trachea, bronchi, and bronchioles, respectively. This system transmits inhaled gases to the respiratory airways, which continue as respiratory bronchioles, alveolar ducts, and terminal alveolar sacs, which exchange gas. Appropriate air conductance through these passageways is crucial for normal physiologic airway function. Here, we present an overview of the physical principles underlying this movement and the pathophysiology, diagnosis, and management of reduced airway conductance.