Inconclusive anecdotal evidence suggests that excessive noise

Recovery
Inconclusive anecdotal evidence suggests that excessive noise
or stimulation during recovery from ketamine can provoke or
exacerbate recovery reactions.4,12,16 However, one ED study
found no correlation between recovery agitation and the degree
of external stimulation in children.82 When feasible, consider
recovery in a well-monitored location with muted lighting,
noise, and physical contact.
Discharge Criteria
There is insufficient evidence for specific minimum discharge
criteria after dissociative sedation. Given that delayed serious
adverse events after ED ketamine administration have not been
reported, this would be difficult to study. Typical
recommendations include a return to pretreatment level of
verbalization, awareness, and purposeful neuromuscular
activity.5 One study has shown that important adverse events
did not occur 30 minutes beyond final drug administration in
children sedated with either ketamine or midazolam.99
The evidence is insufficient to support a predischarge
requirement of tolerating oral fluids after dissociative sedation,
and such attempts might unnecessarily provoke emesis.
Similarly, patients need not be able to ambulate without
assistance after dissociative sedation.
Discharge Instructions
After receiving ketamine, patients can experience ataxia for
hours, and close family observation is warranted to prevent
falls.4,12,16 Oral intake should be delayed for a discrete period
after discharge because of potential emesis.