Effect of allergic bronchopulmonary aspergillosis on FEV1 in children and adolescents with cystic fibrosis: a European Cystic Fibrosis Society Patient Registry analysis.

In contrast to the common clinical belief of ABPA having a serious impact on lung function, the difference in FEV1 between young patients with and without the complication was found to be modest when the effect of other prognostic factors was considered.