• Kathleen Jahn, Meropi Karakioulaki, Desiree M Schumann, Hans H Hirsch, Karoline Leuzinger, Leticia Grize, Stefano Aliberti, Giovanni Sotgiu, Michael Tamm, and Daiana Stolz.
• Clinic of Respiratory Medicine and Pulmonary Cell Research, University Hospital, Basel, Switzerland.
• Eur. J. Intern. Med. 2024 Feb 1; 120: 526152-61.

BackgroundRespiratory infections are an important cause of morbidity and mortality in immunocompromised individuals. Fiberoptic bronchoscopy with bronchoalveolar lavage (BAL) is an important tool to detect infectious agents in immunocompromised patients with low respiratory tract infections (LRTI).Research QuestionBAL changes the management of immunocompromised patients with suspected LRTI.Study Design And MethodsImmunocompromised patients with a suspicion of LRTI underwent diagnostic BAL. The primary composite outcome consisted of pre-defined modifications in the management of the immunocompromised patients following BAL. We quantified the impact of bronchoscopy up to 30 days after the procedure.ResultsA total of 2666 visits from 1301 patients were included in the study and immunosuppression was classified as haematological (n = 1040; 544 patients), solid organ transplantation (n = 666; 107 patients) and other causes (n = 960; 650 patients). BAL led to a change in management in 52.36% (n = 1396) of all cases. This percentage, as well as the 30-day mortality differed significantly amongst the three groups. Age, C-reactive protein and aetiology of infection determined significantly the risk of 30-day mortality in all patients. In 1.89% (n = 50) of all cases, a combination of 2 respiratory viral agents was identified and 24.23% (n = 646) were diagnosed with a single respiratory viral agent.InterpretationBAL leads to changes in management in the majority of immunosuppressed patients. There is a high prevalence of multimicrobial infections and respiratory viral infections in immunocompromised patients with respiratory symptoms. Individual virus infection is associated with diverse risk of a negative outcome.Copyright © 2023. Published by Elsevier B.V.

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