The Effect and Mechanism of Bronchoscopic Lung Volume Reduction by Endobronchial Valve in Korean Emphysema Patients
Recruitment status was: Recruiting
|Study Design:||Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
|Official Title:||The Effect and Mechanism of Bronchoscopic Lung Volume Reduction by Endobronchial Valve in Korean Emphysema Patients|
- Quantitative change of lung volume on computed tomography [ Time Frame: Before procedure and 12 weeks after procedure ]Lung perfusion and ventilation computed tomography protocols
- Pulmonary function test [ Time Frame: Before procedure and 12 weeks after procedure ]Forced expiratory volume in 1s (FEV1), Forced vital capacity (FVC), Total lung capacity (TLC), Residual volume (RV)
- Exercise capacity [ Time Frame: Before procedure and 12 weeks after procedure ]Six-minute walk distance test
- Healthcare quality of life [ Time Frame: Before procedure and 12 weeks after procedure ]St. George Respiratory Questionnaire (SGRQ) and COPD Assessment Test (CAT)
|Study Start Date:||March 2013|
|Estimated Study Completion Date:||April 2014|
|Estimated Primary Completion Date:||April 2014 (Final data collection date for primary outcome measure)|
Experimental: Endobronchial valve:
Endobronchial valve (size 4.0 - 7.0 mm or 5.5 - 8.5 mm) insertion for target bronchi
Device: Endobronchial valve
One-way endobronchial valves are placed in segmental bronchi of the most hyperinflated and least perfused lobe of the emphysematous lungs on computed tomography (CT). Before the procedure, we confirm that the target lobe has no collateral ventilation with other lobes using Chartis® System (Pulmonx, Inc. Redwood City, CA, USA).
The prevalence of chronic obstructive pulmonary disease (COPD) is high (13.4%). In addition, COPD ranked 10th among the causes of death in Korea, and rose to 7th in 2008. Airflow limitation of COPD is caused by a mixture of small airway disease (obstructive bronchiolitis) and parenchyma destruction (emphysema). Bronchodilator and anti-inflammatory drugs, such as corticosteroids are effective to obstructive bronchiolitis. However, these drugs are not effective to emphysema.
Lung volume reduction was devised to remove hyperinflated lung, and to function remaining lung. Surgical lung volume reduction showed improving survival in selected emphysema patients. However, surgical lung volume reduction have bee performed rarely due to significant surgery-related mortality. In this regard, non-surgical lung volume reduction methods have been developed. Of them, bronchoscopic lung volume reduction by endobronchial one-way valve is mostly used method and showed lower early complications than surgery.
The bronchoscopic lung volume reduction using endobronchial valve was proved its efficacy and safety in several large clinical trials. Although there were procedure-related complications such as acute exacerbation of COPD, pneumonia, or hemoptysis, patients receiving endobronchial valves showed improved lung functions, exercise capacity and quality of life. The endobronchial valves got approved for Conformity to European (CE) Mark in Europe. In follow-up study for patients with endobronchial valves, their efficacy and survival of patients were dependent on atelectasis induced by valves. Collateral ventilation plays a key role in endobronchial valve-induced atelectasis. Therefore, assessment of collateral ventilation should be preceded before inserting endobronchial valve.
Computed tomography (CT) can visualize and characterize morphologic change of lung of patients with COPD. Lung perfusion and ventilation CT protocols were developed for quantitative assessment of COPD before and after medical treatment. The CT protocols were expected to select optimal patients for endobronchial valves and to evaluate their efficacy.
We attempt to evaluate efficacy of bronchoscopic lung volume reduction using lung perfusion and ventilation CT and other outcomes.
Please refer to this study by its ClinicalTrials.gov identifier: NCT01869205
|Korea, Republic of|
|Department of Pulmonary and Critical Care Medicine and Clinical Research Center for Chronic Obstructive Airway Diseases, Asan Medical Center, University of Ulsan College of Medicine|
|Seoul, Korea, Republic of, 138-736|
|Principal Investigator:||Sei Won Lee, MD||Department of Pulmonary and Critical Care Medicine and Clinical Research Center for Chronic Obstructive Airway Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea|