What does this research mean for the field?

Patients with acute respiratory failure exhibit four distinct alveolar molecular subphenotypes based on bronchoalveolar lavage fluid biomarkers, which are characterized by varying immune activation states and distinct associations with clinical outcomes. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To identify alveolar subphenotypes in patients with acute respiratory failure using biomarker analysis.

May 20, 2026American Journal of Respiratory and Critical Care Medicine

A14-04 Identification and Characterization of Alveolar Subphenotypes in Acute Respiratory Failure

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To identify alveolar subphenotypes in patients with acute respiratory failure using biomarker analysis.
Analyzed 25 biomarkers from bronchoalveolar lavage fluid using electrochemiluminescent immunoassays in a derivation cohort (n=466).
Employed latent class analysis to classify subphenotypes and validated with external cohorts using similar biomarker measurements.
Applied a gradient-boosted machine algorithm to develop a classification model, interpreting results with Shapley values.
A four-subphenotype model showed significant differences in mortality in the Derivation Cohort (VLMR p=0.018).
Alveolar subphenotypes demonstrated different molecular signatures associated with mortality outcomes.
No significant mortality difference among subphenotypes was found in the Validation Cohorts (log-rank p=0.21).

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Implication

Randomized trial identifies alveolar subphenotypes in acute respiratory failure, suggesting distinct prognostic outcomes.

Cite This Study

Morrell et al. (2026) studied this question.

synapsesocial.com/papers/6a0d4efcf03e14405aa9a2ff https://doi.org/10.1093/ajrccm/aamag162.003

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A14-04 Identification and Characterization of Alveolar Subphenotypes in Acute Respiratory Failure

Key Points

Discussion

Implication

Cite This Study

A14-04 Identification and Characterization of Alveolar Subphenotypes in Acute Respiratory Failure

Key Points

Discussion

Implication

Cite This Study

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