Clinical Study to Evaluate the Exercise Capacity in Patients With Severe Emphysema Treated With Coils

The study hypothesis is that patients with homogeneous emphysema behave differently compared to heterogeneous emphysema with respect to exercise capacity. A better understanding of this difference will allow the investigators to choose the best treatment for each type of patient. The main purpose of this study is to evaluate the change in exercise capacity measured by cycle ergometry in patients with severe emphysema after endoscopic lung volume reduction with coils (eLVR). As a secondary purpose, the investigators want to perform an exploratory, randomized study to compare the results of two different therapeutic approaches in a small sample of patients with homogeneous emphysema.