Geographic disparities in lung transplantation in the United States before and after the November 2017 allocation change

Background The primary lung allocation unit was expanded from the donation service area to a 250-mile radius in 2017. Prior to the change, geographic disparities in donor lung availability impacted waitlist outcomes. We sought to determine if the new allocation system improved these disparities. Methods We conducted a retrospective cohort study comparing the 2-year period before and after the change. Donor lung availability was defined as the...