inclusion criteria: - age greater than or equal to 18 years; - patients admitted for less than 48 hours in intensive care for ards under mechanical ventilation according to the berlin criteria published in 2012 (jama); - origin of ards: covid-19 pneumopathy confirmed by pcr (nasopharyngeal or tracheal sample); - life expectancy> 2 days; - affiliated to a social security scheme; - consent signed by the patient, the relative or the legal representative (except emergency procedure).

inclusion criteria: - age greater than or equal to 18 years; - patients admitted for less than 48 hours in intensive care for ards under mechanical ventilation according to the berlin criteria published in 2012 (jama); - origin of ards: covid-19 pneumopathy confirmed by pcr (nasopharyngeal or tracheal sample); - life expectancy> 2 days; - affiliated to a social security scheme; - consent signed by the patient, the relative or the legal representative (except emergency procedure).

inclusion criteria: - age greater than or equal to 18 years; - patients admitted for less than 24 hours in intensive care for ards under mechanical ventilation according to the berlin criteria published in 2012 (jama); - origin of ards: covid-19 pneumopathy confirmed by pcr (nasopharyngeal or tracheal sample); - life expectancy> 2 days; - affiliated to a social security scheme; - consent signed by the patient, the relative or the legal representative (except emergency procedure).

inclusion criteria: - age greater than or equal to 18 years; - patients admitted for less than 24 hours in intensive care for ards under mechanical ventilation according to the berlin criteria published in 2012 (jama); - origin of ards: covid-19 pneumopathy confirmed by pcr (nasopharyngeal or tracheal sample); - life expectancy> 2 days; - affiliated to a social security scheme; - consent signed by the patient, the relative or the legal representative (except emergency procedure).