Volume 2 Issue 4
Expiratory Flow Limitation and Hyperinflation–Their Relation to Dyspnea in Chronic Obstructive Pulmonary Disease
Matthew Miller, Mark Slootsky, and Ahmet Baydur*
A major symptom of patients with obstructive airway disease is dyspnea, the mechanism of which is related to expiratory flow limitation (EFL) and lung hyperinflation. Chronic obstructive pulmonary disease (COPD) and hyperinflation result in a deficit in the force to return the diaphragm to its normal length at functional residual capacity (FRC), with consequent shortening of its resting length.