- hypoxemic respiratory failure secondary to a cause other than sars-cov2 pneumonia. - hypercapnic respiratory failure. - patient with criteria of orotracheal intubation at admission. - glasgow < 15 - haemodynamic instability that needs drugs treatment - patients with swallowing problems that conditioned an aspiration pneumonia risk.

- hypoxemic respiratory failure secondary to a cause other than sars-cov2 pneumonia. - hypercapnic respiratory failure. - patient with criteria of orotracheal intubation at admission. - glasgow < 15 - haemodynamic instability that needs drugs treatment - patients with swallowing problems that conditioned an aspiration pneumonia risk.