title: Comparison of clinical results for unilateral and bilateral thoracoscopic lung volume reduction.
abstract: BACKGROUND
  It is widely believed that bilateral thoracoscopic lung volume reduction (BTLVR) yields superior results when compared with unilateral thoracoscopic lung volume reduction (UTLVR) with regard to spirometry, functional capacity, oxygenation and quality of life results.
  
  
  METHODS
  To address these issues, we compared the results of patients undergoing UTLVR (N = 338 patients) and BTLVR (N = 344 patients) from 1993 to 1998 at five institutions. Follow-up data were available on 671 patients (98.4%) between 6 and 12 months after surgery, and a patient self-assessment was obtained at a mean of 24 months.
  
  
  RESULTS
  It was found that BTLVR provides superior improvement in measured postoperative percent change in FEV1 (L) (UTLVR 23.3% +/- 55.3 vs BTLVR 33% +/- 41, p = 0.04), FVC(L) (10.5% +/- 31.6 vs 20.3% +/- 34.3, p = 0.002) and RV(L) (-13% +/- -22 vs -22% +/- 17.9, p = 0.015). BTLVR also provides a slight improvement over UTLVR in patient's perception regarding improved quality of life (UTLVR 79% vs BTLVR 88%, p = 0.03) and dyspnea relief (71% vs 61%, p = 0.03). There was no difference in mean changes in PO2 (mm Hg) (UTLV 4.5 +/- 12.3 vs BTLVR 4.9 +/- 13.3, p = NS), 6-minute walk (UTLVR 26% +/- 66.1 vs BTLVR 31% +/- 59.6, p = NS) or decreased oxygen utilization (UTLVR 78% vs BTLVR 74%, p = NS).
  
  
  CONCLUSIONS
  These data suggest that both UTLVR and BTLVR yield significant improvement, but the results of BTLVR seem to be superior with regard to spirometry, lung volumes, and quality of life.
authors.affiliation: Division of Cardiothoracic Surgery, Saint Louis University, Missouri, USA.
authors.forename: G A
authors.initials: GA
authors.lastname: Lowdermilk
authors.forename: R J
authors.initials: RJ
authors.lastname: Keenan
authors.forename: R J
authors.initials: RJ
authors.lastname: Landreneau
authors.forename: S R
authors.initials: SR
authors.lastname: Hazelrigg
authors.forename: J E
authors.initials: JE
authors.lastname: Bavaria
authors.forename: L R
authors.initials: LR
authors.lastname: Kaiser
authors.forename: C A
authors.initials: CA
authors.lastname: Keller
authors.forename: K S
authors.initials: KS
authors.lastname: Naunheim
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011013:Pneumonectomy; D011183:Postoperative Complications / Q000175:diagnosis / Q000209:etiology*; D011656:Pulmonary Emphysema / Q000175:diagnosis / Q000601:surgery*; D011788:Quality of Life; D012129:Respiratory Function Tests; D013906:Thoracoscopy; D016896:Treatment Outcome