Pulmonary Hemodynamics in Patients With Severe Emphysema Pre and Post Bronchoscopic Volume Reduction by Histoacryl or Silver Nitrate (Single Center Experince )

Chronic obstructive pulmonary disease (COPD) continues to be a leading cause of morbidity and is currently the third most common cause of mortality worldwide (1).

In most patients with severe COPD, chronic airflow limitation, lung emphysema with parenchymal destruction and the development of air bullae also occur (2-3) Pulmonary hypertension (PH) is a common consequence of COPD, although the actual overall prevalence of PH in COPD remains unclear (4). Among COPD patients who were to undergo lung-volume-reduction surgery or lung transplantation, mild PH was observed in 50.2%, moderate PH in 9.8%, and severe PH in 3.7%(5). While in most COPD patients who develop PH, pulmonary arterial pressure is only mildly or moderately elevated, (6) PH has an independent prognostic impact on survival. (6,7) The therapeutic options for COPD patients with severe emphysema are limited. Lung volume reduction surgery (LVRS) has been performed as treatment in selected cases, but the referral of patients has been severely influenced by the marked perioperative morbidity and mortality [8]. Less invasive techniques have been developed with the aim of improving patients' pulmonary function, symptoms, and quality of life (QoL) [9]. Among them, the one most commonly used is the endoscopic placement of one way endobronchial valves (EBV) [10-12]. So far patients with severe emphysema and established PH have been excluded from LVRS as well as from endoscopic lung volume reduction (ELVR) therapy.

Whether bronchoscopic lung volume reduction in COPD patients with silver nitrate or histoacryl influences the severity of PH in patients with severe emphysema and PH has yet to be elucidated.

This study is designed as a prospective pilot study, with the primary endpoint being changes in pulmonary hemodynamic parameters after ELVR in patients with severe emphysema.

Secondary endpoints will be changes in lung function parameters, exercise capacity, and QoL.