Dynamic compression of the airways
Dynamic compression of the airways results when intrapleural pressure equals or exceeds alveolar pressure, which causes dynamic collapsing of the lung airways. It is termed dynamic given the transpulmonary pressure varies based on factors including lung volume, compliance, resistance, existing pathologies, etc.
It occurs during forced expiration when intrapleural pressure is greater than atmospheric pressure, and not during passive expiration when intrapleural pressure remains at subatmospheric pressures. Clinically, dynamic compression is most commonly associated with the wheezing sound during forced expiration, such as in individuals with chronic obstructive pulmonary disorder.