Table 1.

Overview of treatment arms

Treatment arms	Assigned interventions
Active comparator: haloperidol	Haloperidol 0.005 mg/kg body weight at induction of anaesthesia
Active comparator: ketamine	Ketamine 1 mg/kg body weight at induction of anaesthesia
Active comparators: haloperidol + ketamine in combination	Haloperidol 0.005 mg/kg body weight + ketamine 1 mg/kg body weight at induction of anaesthesia
Placebo comparator	Normal saline (NaCl 0.9%)