Methods for Assessing Expiratory Flow Limitation during Tidal Breathing in COPD Patients
Patients with severe COPD often exhale along the same flow-volume curve during quite breathing as during forced Collections expiratory vital capacity manoeuvre, and this has been taken as indicating expiratory flow limitation at rest (EFLT).Therefore, EFLT, namely, attainment of maximal expiratory flow during tidal expiration, occurs when an increa