Impact of Inflammation Biomarkers on the Acute Respiratory Distress Syndrome (ARDS) Definition

Study Overview
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Brief Summary
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The ARDS has a clinical definition with criteria of the American-European Consensus Conference (1994). This definition inconveniently applies to a lot of patients with acute respiratory failure. We know that there are 2 forms of ARDS morphology on CT scan : lobar attenuation (loss of aeration with no concomitant excess in lung tissue) predominating in the lower lobes and non lobar attenuation with diffuse and massive loss of aeration with excess lung tissue in all the pulmonary parenchyma. Today, plasmatic biomarkers are used as prognostic and diagnostic markers of ARDS. Some of them are characteristics of the different damages in the ARDS (alveolar epithelium and vascular endothelium lesions) : sRAGE, SP-D, PAI 1 and sICAM 1. This study's hypothesis is that patients with ARDS criteria and lobar morphology on CT scan present loss of aeration but no inflammatory pulmonary oedema, whereas patients with non lobar morphology on CT scan present both characteristics. The primary purpose of our protocol is to show that the patients who respond to ARDS criteria and have a lobar morphology on CT scan do not have an elevation of the biomarkers specific to the pulmonary aggression of ARDS.

Detailed Description
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This multicentric prospective observational study will compare the level of different biomarkers specific to ARDS damages : the soluble form of the receptor for advanced glycation end products (sRAGE), the surfactant protein D (SP-D), Plasminogen Activator Inhibitor type 1 (PAI-1) and Soluble Intercellular Adhesion Molecule-1 (sICAM 1) in the two pulmonary morphologies of ARDS on CT scan : lobar and non lobar. Patients under mechanical ventilation and with ARDS criteria for less than 24 hours(American-European Consensus Conference, 1994) will be enrolled. Within 24 hours of enrolment, 10ml of blood sample will be collected and stored at -80°C. Plasmatic biomarker concentrations will be determined through ELISA method. Within 48 hours of enrolment, patients will have a pulmonary CT scan without injection (end of expiration and ZEEP), a classical practice in this pathology. Nine university hospitals will take part in this study.

Official Title
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Impact of Inflammation Biomarkers on the Acute Respiratory Distress Syndrome Definition in Intensive Care Unit

Conditions
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Acute Respiratory Distress Syndrome

Intervention / Treatment
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* Procedure: blood sample


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients > 18 years Patients within the first 24 hours after onset of ARDS according to the 1994 American-European Consensus Conference (AECC) Patients under mechanical ventilation Exclusion Criteria: Pregnancy Acute exacerbation of diabetes Dialysis for end-stage kidney disease Alzheimer's disease Amyloidosis Evolutive neoplastic lesion Chronic hepatic disease: type C hepatitis, non alcoholic cirrhosis and adenocarcinoma. Evolutive COPD Patients enrolled in another study

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| blood sample<br> | Procedure: blood sample<br>* This study's hypothesis is that patients with ARDS criteria and lobar morphology on CT scan present loss of aeration but no inflammatory pulmonary oedema, whereas patients with non lobar morphology on CT scan present both characteristics. The primary purpose of our protocol is to show that the patients who respond to ARDS criteria and have a lobar morphology on CT scan do not have an elevation of the biomarkers specific to the pulmonary aggression of ARDS.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Plasmatic concentrations of biomarkers specific to the pulmonary aggression of ARDS in the 2 different morphologies on CT scan (lobar and non lobar): • sRAGE • SP-D • sICAM 1 • PAI 1. |  | within 24 hours of enrolment | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Compare the 2 different forms of CT scan morphology in term of : • Mechanical ventilation duration • Mortality at 28 days • Mortality at 90 days |  | within 48 hours of enrolment | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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ARDS, Plasmatic biomarkers, Lung Morphology, Mechanical ventilation, CT scan