Expiratory Flow Limitation Definition, Mechanisms, Methods, and Significance
Figure 2
Isovolume (low-lung volume) flow-pressure relationship in normal subjects, COPD without expiratory flow limitation (NFL) and COPD with expiratory flow limitation (FL). In any case, after , expiratory flow does not increase further on, and its driving pressure becomes . In COPD patients with high airflow resistance and very low , the occurs early, limiting expiratory flow in the tidal volume range.
