Methods for Assessing Expiratory Flow Limitation during Tidal Breathing in COPD Patients
Figure 2
Flow-volume loops of test breaths and preceding control breaths of three representative COPD patients with different degrees of flow-limitation: not flow-limited (NFL) (a), flow-limited (EFL) over less than 50% VT (b), and flow-limited from peak expiratory flow (EFL) (c). Arrows indicate points at which NEP was applied and removed (modified from [10]).
