title: Despite decreased wait-list times for lung transplantation, lung allocation scores continue to increase.
abstract: BACKGROUND
  In May 2005, the lung allocation score (LAS) was introduced as a means of allocating donor lungs in order to decrease wait-list mortality and prioritize candidates based on medical urgency and posttransplant survival. The purpose of this study was to assess changes in recipient wait-list times and mean LAS since the introduction of the LAS model.
  
  
  METHODS
  The United Network for Organ Sharing provided de-identified patient-level data. The study population consisted of all patients in the United States with a reported LAS (n = 3529) undergoing lung transplantation between May 7, 2005 and November 7, 2007. The study period was divided into 6-month intervals. The Kruskal-Wallis test was used to assess differences in variables with nonparametric distributions. The nonparametric trends test was used to determine significance of trends over time.
  
  
  RESULTS
  There was a significant decrease in wait-list time during the study period, while LAS among transplant recipients increased (p < 0.001). There was no significant change in FVC (49.3 +/- 17.5%, p = 0.48) or pulmonary capillary wedge pressure (11.1 +/- 5.8 mm Hg, p = 0.23); however, there was a significant increase in age (51.5 +/- 13.9 years, p < 0.001) during the study period. When stratified by etiology, the LAS increased for both interstitial pulmonary fibrosis and COPD patients (p < 0.001). Moreover, the overall number of patients listed for transplantation as well as the LAS among transplant candidates increased (p < 0.001).
  
  
  CONCLUSIONS
  Two years after initiation of the LAS model, wait-list times continue to decrease while mean LAS continued to increase. This increase in LAS among transplant recipients was observed most notably in patients with interstitial pulmonary fibrosis and COPD, and reflected in an increased mean LAS at the time of listing.
authors.affiliation: Division of Cardiothoracic Surgery, Department of Surgery, the Division of Pulmonary, Allergy.
authors.forename: Alexander
authors.initials: A
authors.lastname: Iribarne
authors.affiliation: Division of Cardiothoracic Surgery, Department of Surgery, the Division of Pulmonary, Allergy.
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Russo
authors.affiliation: Division of Cardiothoracic Surgery, Department of Surgery, the Division of Pulmonary, Allergy.
authors.forename: Ryan R
authors.initials: RR
authors.lastname: Davies
authors.affiliation: International Center for Health Outcomes and Innovation Research, College of Physicians and Surgeons, Columbia University, New York, NY.
authors.forename: Kimberly N
authors.initials: KN
authors.lastname: Hong
authors.affiliation: International Center for Health Outcomes and Innovation Research, College of Physicians and Surgeons, Columbia University, New York, NY.
authors.forename: Annetine C
authors.initials: AC
authors.lastname: Gelijns
authors.affiliation: Division of Cardiothoracic Surgery, Department of Surgery, the Division of Pulmonary, Allergy.
authors.forename: Matthew D
authors.initials: MD
authors.lastname: Bacchetta
authors.affiliation: Division of Cardiothoracic Surgery, Department of Surgery, the Division of Pulmonary, Allergy.
authors.forename: Frank
authors.initials: F
authors.lastname: D'Ovidio
authors.affiliation: Critical Care, Department of Medicine, Columbia University, New York, NY.
authors.forename: Selim
authors.initials: S
authors.lastname: Arcasoy
authors.affiliation: Division of Cardiothoracic Surgery, Department of Surgery, the Division of Pulmonary, Allergy. Electronic address: JS2106@columbia.edu.
authors.forename: Joshua R
authors.initials: JR
authors.lastname: Sonett
mesh_terms: D003550:Cystic Fibrosis / Q000601:surgery; D006801:Humans; D016040:Lung Transplantation / Q000706:statistics & numerical data*; D008875:Middle Aged; D029424:Pulmonary Disease, Chronic Obstructive / Q000601:surgery; D013997:Time Factors; D009927:Tissue and Organ Procurement / Q000379:methods*