title: A multicenter trial of an intrabronchial valve for treatment of severe emphysema.
abstract: OBJECTIVE
  Minimally invasive endoscopic treatment of emphysema could provide palliation with less risk than lung volume reduction surgery and offer therapy to patients currently not considered for lung volume reduction surgery. The Intrabronchial Valve is used to block bronchial airflow in the most emphysematous areas of lung.
  
  
  METHODS
  Patients with severe chronic obstructive pulmonary disease and heterogeneous upper lobe-predominant emphysema were eligible. Patients underwent flexible bronchoscopic placement of valves into segmental or subsegmental airways in both upper lobes. Outcomes assessed over a minimum of 6 months of follow-up included the safety, feasibility, tolerance, and success of valve placement; health-related quality of life; exercise capacity; pulmonary function; and gas exchange.
  
  
  RESULTS
  Five centers treated 30 patients. Patient follow-up ranged from 1 to 12 months. A mean of 6.1 valves were placed per patient. Valves were positioned by means of flexible bronchoscopy in 99% of desired airways, and the procedure duration ranged from 15 to 125 minutes (mean, 65 minutes). Hospital discharge occurred within 2 days in 27 of 30 patients. There were no deaths or episodes of valve migration, tissue erosion, or significant bleeding. Eighty-three percent of patients had no adverse events judged probably or definitely related to the device. Patients experienced significant improvement in health-related quality of life, although the physiologic and exercise outcomes did not show statistically significant improvements.
  
  
  CONCLUSIONS
  These first multicenter results with the Intrabronchial Valve demonstrate significant improvements in health-related quality of life and acceptable safety, ease of use, and procedural complication rates. The valve might be a safer and less-invasive alternative to surgical therapy for patients with severe emphysema.
authors.affiliation: Division of Cardiothoracic Surgery, the University of Washington, Seattle, Wash 98195-6310, USA. dewood@u.washington.edu
authors.forename: Douglas E
authors.initials: DE
authors.lastname: Wood
authors.forename: Robert J
authors.initials: RJ
authors.lastname: McKenna
authors.forename: Roger D
authors.initials: RD
authors.lastname: Yusen
authors.forename: Daniel H
authors.initials: DH
authors.lastname: Sterman
authors.forename: David E
authors.initials: DE
authors.lastname: Ost
authors.forename: Steven C
authors.initials: SC
authors.lastname: Springmeyer
authors.forename: H Xavier
authors.initials: HX
authors.lastname: Gonzalez
authors.forename: Michael S
authors.initials: MS
authors.lastname: Mulligan
authors.forename: Thomas
authors.initials: T
authors.lastname: Gildea
authors.forename: Ward V
authors.initials: WV
authors.lastname: Houck
authors.forename: Michael
authors.initials: M
authors.lastname: Machuzak
authors.forename: Atul C
authors.initials: AC
authors.lastname: Mehta
mesh_terms: D000328:Adult; D000368:Aged; D001980:Bronchi; D001999:Bronchoscopy; D017079:Exercise Tolerance; D005260:Female; D005541:Forced Expiratory Volume; D006801:Humans; D008176:Lung Volume Measurements; D008297:Male; D008875:Middle Aged; D010166:Palliative Care; D019736:Prostheses and Implants / Q000009:adverse effects; D029424:Pulmonary Disease, Chronic Obstructive / Q000503:physiopathology / Q000628:therapy; D011656:Pulmonary Emphysema / Q000503:physiopathology / Q000628:therapy*; D011659:Pulmonary Gas Exchange; D011788:Quality of Life