Table 4.

Side effects n (%)

	Group 1 n=13	Group 2 n=13	Group 3 n=13	Group 4 n=13
Nausea-vomiting	1 (7.7)	3 (23)	1 (7.7)	1 (7.7)
Nightmares	1 (7.7)	0 (0)	3 (23)	4 (30.7)
Hallucination	-	-	-	-

p>0.05. Group 1: control group. Group 2: single-bolus dose of 0.5 mg kg⁻¹ ketamine IV at induction. Group 3: bolus dose of 0.5 mg kg⁻¹ ketamine IV at induction and perioperative ketamine infusion at a rate of 0.25 mg kg⁻¹ h⁻¹. Group 4: a bolus of 0.5 mg kg⁻¹ ketamine IV at induction and perioperative and postoperative ketamine infusion at a rate of 0.25 mg kg⁻¹ h⁻¹