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Objectives: Tissue hypoxia is the main cause of multi-organ dysfunction in sepsis. However, effective pharmacological treatments to combat sepsis-induced tissue hypoxia are not available. Emerging experimental and clinical evidence reveals an evolutionary conserved action of thyroid hormone (TH) to adapt injured tissue to hypoxic conditions via its action on p38 MAPK, Akt signaling pathways. In addition, TH has favorable effects on the immune system and viral load in infected tissue. Non-Thyroid Illness Syndrome is common in sepsis, acute myocardial infarction and trauma and is associated with increased mortality. Thus, TH may be a novel treatment in the setting of critical illness due to viral infection in which hypoxia prevails. The present study aims to address the efficacy and safety of acute administration of triiodothyronine (T3) in critically ill COVID-19 infected patients requiring mechanical respiratory support or Extra Corporeal Membrane Oxygenation (ECMO). Trial design: This study is a phase II, parallel, 2-arm (1:1 ratio), multi-centre, prospective, randomized, double-blind, placebo controlled trial. Participants: Male and female patients aged over 18 years old who are diagnosed with pulmonary infection due to COVID-19, admitted to Intensive Care Unit and requiring mechanical ventilation or ECMO will be enrolled in this trial. Patients will be excluded in cases of pregnancy, severe systemic disease with life expectancy less than 6 months, participation in another trial of an investigational drug or device, corticosteroid and/or sympathomimetic use before initiation of treatment. All data will be collected in electronic CRF files. Participants will start to be recruited from the ICU center of "ATTIKO" University Hospital in Greece. We aim to include two more clinical sites in the trial one from Greece and one from Germany

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