- diagnosed with cancer (at any stage); - hemodynamic instability (need for vasopressors); - pregnant women; immunocompromised patients; - palliative care; - inclusion in any other interventionist study; - heart failure as a predominant cause of acute respiratory failure; - decompensated liver cirrhosis; - hiv +; - dialysis; - home / long-term oxygen therapy; - idiopathic pulmonary fibrosis

- diagnosed with cancer (at any stage); - hemodynamic instability (need for vasopressors); - pregnant women; immunocompromised patients; - palliative care; - inclusion in any other interventionist study; - heart failure as a predominant cause of acute respiratory failure; - decompensated liver cirrhosis; - hiv +; - dialysis; - home / long-term oxygen therapy; - idiopathic pulmonary fibrosis