Table 1.

Detailed information about the included studies.

Study	Samplesize	ASA Grade	Anesthesia position	Local anesthetic	Intervention	Comparison	Outcome
Teymourian 20184	152	I–II	Sitting	Bupivacaine	7.5 µg DEX	DEX vs. placebo	(5)
Sushruth 201832	60	II	Right lateral	Bupivacaine	5 µg DEX	DEX vs. placebo	(1) (2) (3) (4) (6) (7) (9)
Qi 201631	80	I–II	Lateral decubitus	Bupivacaine	5 µg DEX	DEX vs. placebo	(1) (2) (3) (4) (5) (6) (7) (8) (9)
Nasseri 201730	50	I–II	Sitting	Bupivacaine	5 µg DEX	DEX vs. placebo	(6) (7) (8) (9)
Mostafa 201929	60	I–II	Sitting	Bupivacaine	5 µg DEX	DEX vs. placebo	(1) (3) (5)
He 201728	90	I–II	Left lateral	Bupivacaine	Group 1: 2.5 µg DEX Group 2: 5 µg DEX	DEX vs. placebo	(5) (7) (8)
Li 201933	100	I–II	Left lateral	Bupivacaine	5 µg DEX	DEX vs. placebo	(1) (2) (3) (4) (6) (8) (9)
Qiu 201234	80	II–III	Left lateral	Bupivacaine	5 µg DEX	DEX vs. placebo	(1) (2) (3) (4) (6) (9)
Wang 201735	100	II–III	Left lateral	Bupivacaine	5 µg DEX	DEX vs. placebo	(1) (2) (3) (4) (5) (6) (8) (9)
Xu 201636	120	I–II	Left lateral	Bupivacaine	6 µg DEX	DEX vs. placebo	(1) (2) (3) (4) (6) (9)

Abbreviations: ASA, American Society of Anesthesiology; DEX, dexmedetomidine.