Inclusion Criteria:  Critically ill patient above 18 year old, admitted in the Intensive Care of San Bortolo Hospital, Vicenza, and San Matteo Hospital, Pavia; positive specimen for SARS-COV2 PCR; tracheal intubation for respiratory distress related to SARS COV2 pneumonia  Exclusion Criteria:  negative specimen for SARS-COV2 PCR out of hospital intubation intubation during cardiac arrest intubation in the contest of general anesthesia for surgery