Early Biological and Mechanical Profiling in Sepsis-Associated ARDS
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- This is an observational study: the protocol does not assign a study treatment.
- Who it may be relevant to
- Registry conditions: Acute Hypoxemic Respiratory Failure, Sepsis, ARDS (Acute Respiratory Distress Syndrome). Basic parameters: from 18 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Spain
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Official title
Characterization of Early Biological and Mechanical Profiles in Sepsis-Associated ARDS for Studying Compartamentalization (Serial Bronchoalveolar Lavage and Plasma Biomarkers) to Identify Inflammatory and Hybrid Subphenotypes
Overview
Sepsis-associated acute respiratory distress syndrome (ARDS) is one of the deadliest and most biologically heterogeneous forms of respiratory failure. Despite uniform diagnostic criteria, patients with septic ARDS show wide variability in inflammatory intensity, alveolar epithelial and endothelial injury, alveolar fluid composition, ventilatory mechanical properties, and clinical evolution. Early identification of these differences may enable better prognostication and more precise treatment. This prospective observational study aims to deeply characterize the earliest phases of septic ARDS by integrating serial bronchoalveolar lavage (BAL) at 0, 24 and 72 hours with parallel plasma biomarker profiling and detailed mechanical ventilation data. This design captures the evolving biological and physiological landscape of septic ARDS during its most dynamic window. The central goal is to identify systemic, alveolar, and hybrid bio-mechano-inflammatory subphenotypes that can inform personalized approaches to support, risk stratification, and future interventional trials.
Detailed description
Acute respiratory distress syndrome caused by sepsis is not a uniform disease but a syndrome comprising multiple biological and mechanical states. The Berlin Definition provides a useful clinical entry point but does not capture the profound heterogeneity found in molecular pathways, alveolar immune activation, epithelial disruption, endothelial dysfunction, and mechanical ventilation responses.
The first 72 hours of ARDS represent a critical, rapidly evolving biological landscape where systemic cytokine release, alveolar epithelial injury, endothelial activation, and capillary-alveolar permeability all fluctuate dramatically. These early shifts are believed to determine downstream trajectories such as ventilator dependence, multiorgan dysfunction, and mortality. Capturing this dynamic process requires repeated sampling at predefined intervals rather than the traditional single one-time measurement.
ARDS emerges primarily within the alveolar space; yet most studies rely exclusively on plasma biomarkers, which provide only a partial window into the alveolus. The pulmonary compartment often behaves independently of the systemic circulation due to the compartmentalization of inflammatory mediators. BAL sampling therefore offers a unique opportunity to interrogate the lung directly. On the other hand, ventilatory mechanics-in particular driving pressure, plateau pressure, lung compliance, and ventilatory ratio-reflect the biomechanical stress conditions imposed on the lung, which may interact with or even exacerbate biological injury.
Thus, inflammation, epithelial damage, endothelial leak, alveolar flooding, and mechanical stress constitute interdependent dimensions of the early ARDS process.
This study integrates:
* Serial BAL to measure alveolar cytokines, epithelial and endothelial markers, proteins and permeability markers. * Serial plasma biomarkers to identify systemic inflammatory phenotypes and compare them with alveolar phenotypes. * Mechanical ventilation parameters to quantify biomechanical stress and its role in injury amplification. * Clinical endpoints and physiology to connect biological patterns with real outcomes.
This multidimensional dataset is designed to reveal biological, mechanical, and hybrid subphenotypes which could explain why patients who are clinically similar diverge into starkly different trajectories.
Primary outcome measures
- Early hybrid biological-mechanical subphenotypes [Time frame: From enrollment to 72 hours]
Eligibility criteria
Inclusion criteria
- Age ≥18
- ARDS diagnosis per Berlin definition
- Sepsis per Sepsis-3 criteria
- Invasive mechanical ventilation
- Expected to remain intubated ≥72 hours
- Consent from surrogate
Exclusion criteria
- Contraindications to bronchoscopy/BAL
- Refractory hemodynamic instability
- Pregnancy
- Pulmonary transplant patients
- Surrogate declines participation
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Observational model
- Cohort
Study locations
Spain · 1 center
- Hospital Universitari Vall d'Hebron — Barcelona
Identifiers
NCT: NCT07281911 · EARLY-SARDS-2025-11