Table 1.

Clinically recommended concentrations of anaesthetics/opioids used in this systematic review.

Anaesthetic/Opioid	Injectable Concentration	Recommended Infusion Dose	Maximum Single Dose	Reference
Lidocaine	5–20 mg/mL	1.2 mg/kg/h	4.5 mg/kg (300 mg)	[19,20]
Morphine	2–10 mg/mL	0.1–0.2 mg/kg/4 h	No maximum dose	[21,22]
Ropivacaine	2.5–7.5 mg/mL	-	3 mg/kg (200 mg)	[19,20]
Levobupivacaine	2–10 mg/mL	-	2 mg/kg (150 mg)	[19,20]