title: Lung volume reduction surgery vs medical treatment: for patients with advanced emphysema.
abstract: OBJECTIVE
  To contribute to the knowledge on the therapeutic value of lung volume reduction surgery (LVRS).
  
  
  METHODS
  Two similar, independently conceived and conducted, multicenter, randomized clinical trials.
  
  
  METHODS
  The Canadian Lung Volume Reduction (CLVR) study and the Overholt-Blue Cross Emphysema Surgery Trial (OBEST).
  
  
  METHODS
  Using a fixed-effects meta-analysis, the 6-month results produced by the addition of LVRS to optimal medical therapy were compared to those obtained from optimal medical therapy alone. Patients were required to have severe emphysema, marked airflow limitation (ie, FEV(1), 15 to 40% predicted), hyperinflation (total lung capacity [TLC], > 120% predicted), CO(2), < 55 mm Hg, and measurable dyspnea (chronic respiratory disease questionnaire [CRDQ] scores </= 4 for the CLVR study, or Medical Research Council dyspnea scale >/= 1 for the OBEST). Optimal medical therapy included pulmonary rehabilitation in both arms of both studies.
  
  
  RESULTS
  The CLVR study randomized 58 patients and the OBEST randomized 35 patients for a total of 93 patients. Of these, 54 patients were randomized to undergo surgery, and 39 patients were randomized to receive medical treatment. The 6-month mortality rate (including operative mortality) in the surgical and medical cohorts was similar (5.6% vs 5.1%, respectively). A comparison of the medical and surgical arms of the combined CLVR study/OBEST population showed that LVRS was associated with a higher FEV(1) (167 mL or 24% predicted; 95% confidence interval [CI], 29 to 304; p = 0.017), lower residual volume (-1,342 mL or 24.5% predicted; 95% CI, -1,844 to -840; p < 0.001), lower TLC (-1,044 mL or 13% predicted; 95% CI, -1483 to -605; p < 0.001), and higher 6-min walk distance (148.8 feet; 95% CI, 24.3 to 273.2; p = 0.019). Each domain of the CRDQ showed statistically significant improvement in the surgical arm of the study, but not in the medical arm. The summary physical component scale of the Medical Outcomes Study 36-item short form (SF-36) was also more favorable in the LVRS cohort (6.9; 95% CI, 2.86 to 10.90; p < 0.001). The summary mental component scale of the SF-36 did not show a statistically significant difference between the two groups.
  
  
  CONCLUSIONS
  Six months after randomization, LVRS produced better palliation than optimal medical therapy in patients with advanced emphysema.
authors.affiliation: McMaster University, Hamilton Ontarion, Canada.
authors.forename: John D
authors.initials: JD
authors.lastname: Miller
authors.forename: Robert L
authors.initials: RL
authors.lastname: Berger
authors.forename: Richard A
authors.initials: RA
authors.lastname: Malthaner
authors.forename: Bartolome R
authors.initials: BR
authors.lastname: Celli
authors.forename: Charles H
authors.initials: CH
authors.lastname: Goldsmith
authors.forename: Edward P
authors.initials: EP
authors.lastname: Ingenito
authors.forename: David
authors.initials: D
authors.lastname: Higgins
authors.forename: Peter
authors.initials: P
authors.lastname: Bagley
authors.forename: Gerard
authors.initials: G
authors.lastname: Cox
authors.forename: Cameron D
authors.initials: CD
authors.lastname: Wright
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D018450:Disease Progression; D017079:Exercise Tolerance; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011013:Pneumonectomy; D011656:Pulmonary Emphysema / Q000503:physiopathology / Q000601:surgery*; D013997:Time Factors