To discuss the distinctions between postoperative ARDS and medical ARDS, highlighting patient variability and prognostic factors.
Approach:
Comparison of Cohorts: The article reviews findings from a large cohort study comparing postoperative ARDS and medical ARDS, emphasizing differences in mortality and prognostic determinants.
Epidemiological Evidence: The authors reference a nationwide Spanish study that indicates postoperative ARDS accounts for a significant proportion of ARDS cases and is associated with higher comorbidity.
Pathophysiological Framework: The discussion supports a framework where postoperative ARDS is driven by extrapulmonary processes rather than isolated pulmonary disorders.
Key Findings:
Postoperative ARDS is characterized by lower mortality and more favorable early trajectories compared to medical ARDS.
Prognostic determinants in postoperative ARDS are primarily related to extrapulmonary organ dysfunction.
There is a convergence in mortality rates between postoperative and medical ARDS in recent years.
Interpretation:
Postoperative ARDS may represent a distinct clinical phenotype.
Limitations:
Differences in study settings, definitions of outcomes, and case ascertainment may affect the comparison of findings.
The Pensier et al. study was conducted in a specialized ICU, while the nationwide study included all hospitalizations.
