- covid-19negative(-) ards - age less than 18 years - more than 7 days since initiation of mechanical ventilation - more than 96 hours since meeting ards criteria - patient, surrogate or physician not committed to full intensive care support. - pregnancy

- covid-19negative(-) ards - age less than 18 years - more than 7 days since initiation of mechanical ventilation - more than 96 hours since meeting ards criteria - patient, surrogate or physician not committed to full intensive care support. - pregnancy