Other medications (remifentanil) may be considered but lack evidence and do not have the same characteristics of ketamine (preserved airway protective reflexes, preserved respiratory drive, rapid onset)
Weingart found that a small subset of patients (severe asthma) improved sufficiently as to no longer require<unk> .  In these cases, avoid neuromuscular blockade, allow the induction agent to wear off (or administer further boluses to preserve oxygenation)
Delayed sequence intubation
Rapid sequence intubation
Awake intubation
Extracorporeal membrane oxygenation
Extubation
Weaning mechanical ventilation
Blind digital intubation
Bag valve mask ventilation