A hot topic in lung transplantation is the treatment of persisting sinus disease/colonization in CF patients to prevent descending graft colonization and chronic allograft dysfunction. From 2012, the Hannover transplantation group has been using a conservative approach with topical nasal inhalation. It is now necessary to analyse the impact of the new approach on graft colonization, incidence of BOS, symptoms, QoL etc in comparison to a historical cohort. It is also important to establish which is the best among the different inhaled antibiotic regimens currently available.