Absolute
unwitnessed cardiac arrest
non-reversible, progressive cardiac disease in a patient who is not a transplant candidate
non-reversible, progressive respiratory disease
severe, chronic pulmonary hypertension
advanced cancer
Relative
older than 75 years
multisystem trauma
CNS injury
multiple organ failure
VV
unsupported cardiac failure, cardiac arrest, severe pulmonary hypertension, significant immunosupression
VA
Aortic dissection or severe aortic regurgitation
unwitnessed cardiac arrest
non-reversible, progressive cardiac disease in a patient who is not a transplant candidate
non-reversible, progressive respiratory disease
severe, chronic pulmonary hypertension
advanced cancer
older than 75 years
multisystem trauma
CNS injury
multiple organ failure
unsupported cardiac failure, cardiac arrest, severe pulmonary hypertension, significant immunosupression
Aortic dissection or severe aortic regurgitation
Extracorporeal membrane oxygenation
Pediatric jet ventilation
Mechanical ventilation 
Advanced airway adjuncts
Bag valve mask ventilation
Delayed sequence intubation
Noninvasive ventilation
Rapid sequence intubation