Observational studyWiener klinische Wochenschrift2025
Immunophenotyping of bronchoalveolar lavage and functional impairment in post-COVID syndrome : Insights from a prospective cohort trial.
Observational study in Wiener klinische Wochenschrift, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Authors and funding
8 authors.
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Abstract
objectiveFollowing recovery from COVID-19, there is evidence for pulmonary sequelae and functional impairment. Data regarding the immunopathological mechanisms are limited. This study aimed to investigate the relationship between bronchoalveolar lavage fluid (BALF) cellularity, lung function impairment and high-resolution computed tomography (HRCT) changes in post-COVID syndrome patients.
methodsPatients with post-COVID syndrome were enrolled in this Austrian single-center prospective observational cohort study. All patients underwent a pulmonary function test (PFT) and chest HRCT. Those with pathological HRCT findings underwent bronchoscopy with BALF sampling for differential cell count and fluorescence-activated cell sorting analysis.
resultsIn this study 26 patients with post-COVID syndrome underwent bronchoscopy with BAL. The HRCT showed ground-glass opacifications (69.2%), organizing pneumonia (7.7%) or both (11.5%). The PFT revealed restrictive lung disease in 38.5% and reduced diffusion capacity in 68%, 19.2% showed a pathological BAL cell pattern predominantly consisting of CD4
conclusionA notable percentage of patients with post-COVID syndrome with persistent HRCT changes showed T‑helper lymphocytic inflammation in the lungs. The degree of alveolar lymphocytosis was associated with lung function impairment. This could suggest that a prolonged inflammatory response in the alveolar compartment contributes to the pathogenesis of post-COVID syndrome.
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