inclusion criteria: * any age. * any sex. * with covid-19 confirmed (or awaiting confirmation) by pcr. * with a clinical decision of initiation of mechanical ventilation or with \<48 h under mechanical ventilation. * informed consent signed by the participant's responsible.

inclusion criteria: * any age. * any sex. * with covid-19 confirmed (or awaiting confirmation) by pcr. * with a clinical decision of initiation of mechanical ventilation or with \<48 h under mechanical ventilation. * informed consent signed by the participant's responsible.

inclusion criteria: - any age. - any sex. - with covid-19 confirmed (or awaiting confirmation) by pcr. - with a clinical decision of initiation of mechanical ventilation or with <48 h under mechanical ventilation. - informed consent signed by the participant's responsible.

inclusion criteria: - any age. - any sex. - with covid-19 confirmed (or awaiting confirmation) by pcr. - with a clinical decision of initiation of mechanical ventilation or with <48 h under mechanical ventilation. - informed consent signed by the participant's responsible.