title: National Emphysema Treatment Trial redux: accentuating the positive.
abstract: OBJECTIVE
  Under the Freedom of Information Act, we obtained the follow-up data of the National Emphysema Treatment Trial (NETT) to determine the long-term outcome for "a heterogeneous distribution of emphysema with upper lobe predominance," postulated by the NETT hypothesis to be optimal candidates for lung volume reduction surgery.
  
  
  METHODS
  Using the NETT database, we identified patients with heterogeneous distribution of emphysema with upper lobe predominance and analyzed for the first time follow-up data for those receiving lung volume reduction surgery and those receiving medical management. Furthermore, we compared the results of the NETT reduction surgery group with a previously reported consecutive case series of 250 patients undergoing bilateral lung volume reduction surgery using similar selection criteria.
  
  
  RESULTS
  Of the 1218 patients enrolled, 511 (42%) conformed to the NETT hypothesis selection criteria and received the randomly assigned surgical or medical treatment (surgical = 261; medical = 250). Lung volume reduction surgery resulted in a 5-year survival benefit (70% vs 60%; P = .02). Results at 3 years compared with baseline data favored surgical reduction in terms of residual volume reduction (25% vs 2%; P < .001), University of California San Diego dyspnea score (16 vs 0 points; P < .001), and improved St George Respiratory Questionnaire quality of life score (12 points vs 0 points; P < .001). For the 513 patients with a homogeneous pattern of emphysema randomized to surgical or medical treatment, lung volume reduction surgery produced no survival advantage and very limited functional benefit.
  
  
  CONCLUSIONS
  Patients most likely to benefit from lung volume reduction surgery have heterogeneously distributed emphysema involving the upper lung zones predominantly. Such patients in the NETT trial had results nearly identical to those previously reported in a nonrandomized series of similar patients undergoing lung volume reduction surgery.
authors: Division of Thoracic Surgery, Department of Surgery, University of Pennsylvania, Philadelphia, PA 19104, USA.
authors: Pablo Gerardo
authors: PG
authors: Sanchez
authors: John Charles
authors: JC
authors: Kucharczuk
authors: Stacey
authors: S
authors: Su
authors: Larry Robert
authors: LR
authors: Kaiser
authors: Joel David
authors: JD
authors: Cooper
mesh_terms: D022126:Access to Information; D016009:Chi-Square Distribution; D019992:Databases as Topic; D004417:Dyspnea / Q000209:etiology / Q000517:prevention & control; D019317:Evidence-Based Medicine; D017079:Exercise Tolerance; D005541:Forced Expiratory Volume; D006801:Humans; D053208:Kaplan-Meier Estimate; D008168:Lung / Q000503:physiopathology / Q000601:surgery*; D011013:Pneumonectomy / Q000009:adverse effects / Q000401:mortality; D011656:Pulmonary Emphysema / Q000150:complications / Q000401:mortality / Q000503:physiopathology / Q000601:surgery / Q000628:therapy*; D011788:Quality of Life; D016032:Randomized Controlled Trials as Topic; D020127:Recovery of Function; D012107:Research Design; D012115:Residual Volume; D011795:Surveys and Questionnaires; D013997:Time Factors; D016896:Treatment Outcome; D014481:United States