[Retracted] Efficacy of Dexamethasone versus Dexmedetomidine Combined with Local Anaesthetics in Brachial Plexus Block: A Meta-Analysis and Systematic Review

Table 1

Trial characteristics.

Author, year	Country	Sample size		Nerve block approach	Operative site	Technique	Type, concentration, and volume of local anaesthetics	Concentration and volume of dexamethasone	Concentration and volume of dexmedetomidine
		Dexamethasone	Dexmedetomidine
Yaghoobi, 2019	Iran	25	26	Infraclavicular block	Forearm surgery	Ultrasound	Lidocaine 2%, 28 ml	2 mL (8 mg)	2 mL (1 µg/kg)
Verma, 2016	India	50	50	Interscalene groove	Forearm surgery	Nerve stimulation	Ropivacaine 0.5%, 30 ml	2 mL (8 mg)	1ml (50 µg)
Singh, 2020	India	20	20	Supraclavicular approach	Forearm surgery	Ultrasound	Ropivacaine 0.5%, 30 ml	3 mL (8 mg)	2 mL (1 µg/kg)
Lee, 2016	Korea	17	17	Axillary approach	Forearm surgery	Ultrasound + nerve stimulation	Ropivacaine 0.5%, 20 ml	2 mL (10 mg)	2 ml (100 µg)
Kumar, 2014	India	30	30	Interscalene groove	Forearm surgery	Ultrasound + nerve stimulation	Bupivacaine 0.25%, 40 ml	2 mL (8 mg)	2 mL (50 µg)
Aliste, 2019	Chile	60	60	Infraclavicular block	Forearm surgery	Ultrasound	35 mL of lidocaine 1% bupivacaine 0.25% with epinephrine 5 g/ml	5 mg	(100 µg)
Adinarayanan, 2019	India	30	30	Supraclavicular approach	Forearm surgery	Ultrasound + nerve stimulation	Bupivacaine 0.5%, 25 ml	2 mL (8 mg)	2 mL (1 µg/kg)