title: Spirometry after transplantation: how much better are two lungs than one?
abstract: BACKGROUND
  The purpose of this study was to determine how much double lung transplantation improves lung function over single lung transplantation and to identify predictors of lung function after transplantation.
  
  
  METHODS
  From February 1990 to November 2005, 463 adults underwent lung transplantation. Among 379 of these patients (82%), 6372 evaluations of postoperative normalized forced expiratory volume in 1 second (FEV(1)) and forced vital capacity (FVC) were analyzed using longitudinal temporal decomposition methods for repeated continuous measurements. We characterized the time course of postoperative spirometry, compared it between double and single lung transplantation, and identified its modulators.
  
  
  RESULTS
  FEV(1) (% of predicted) was only somewhat better after double than single lung transplantation (65%, 58%, and 59% vs 51%, 43%, and 40% at 1, 3, and 5 years, p = 0.03), as was FVC (% of predicted) (67%, 68%, and 66% vs 62%, 56%, and 51%, p < 0.0001). Both FEV1% and FVC% increased sharply to 1 year. For double lung transplantation, these values persisted, with minimal decline to 5 years; but for single lung transplantation, they continuously declined to 5 years. Values for double lung transplantation remained higher than for single lung transplantation at all time points but never approached twice the value. Patients undergoing double lung transplantation for emphysema had the highest postoperative FEV1% and FVC%, but also the lowest values for single lung transplantation; the benefit of double lung transplantation was between these values for other diagnoses.
  
  
  CONCLUSIONS
  Spirometry weakly favors double lung over single lung transplantation. The advantage of spirometry values alone may not justify double lung transplantation.
authors: Department of Thoracic and Cardiovascular Surgery, Cleveland Clinic, Cleveland, Ohio 44195, USA. masond2@ccf.org
authors: David P
authors: DP
authors: Mason
authors: Jeevanantham
authors: J
authors: Rajeswaran
authors: Sudish C
authors: SC
authors: Murthy
authors: Ann M
authors: AM
authors: McNeill
authors: Marie M
authors: MM
authors: Budev
authors: Atul C
authors: AC
authors: Mehta
authors: Gösta B
authors: GB
authors: Pettersson
authors: Eugene H
authors: EH
authors: Blackstone
mesh_terms: D000328:Adult; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D005541:Forced Expiratory Volume; D006084:Graft Rejection; D006085:Graft Survival; D006801:Humans; D016040:Lung Transplantation / Q000379:methods* / Q000401:mortality*; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D011182:Postoperative Care; D011300:Preoperative Care / Q000379:methods; D011336:Probability; D012189:Retrospective Studies; D012307:Risk Factors; D013147:Spirometry; D015996:Survival Rate; D014019:Tissue Donors; D014109:Total Lung Capacity; D016896:Treatment Outcome; D014692:Ventilation-Perfusion Ratio