Combined ultrasound and nerve stimulator-guided deep nerve block may decrease the rate of local anesthetics systemic toxicity: a randomized clinical trial

Table 4 Associated risk factors for local anesthetic systemic toxicity

Categorical Variables		No. LAST Events(%)	OR	95% CI	P
Method of Block	N	4(4)			0.037(N vs U)
	U	12(12)			0.006 (U vs M)
	M	2(2)			0.407 (M vs N)
Needle passes(times)	2–5	11(5.1)	0.58	0.217–1.550	0.272
Needle passes(times)	6-	7(8.4)	1
Sex	Male	2(1.3)	1
Sex	Female	16(11.0)	9.488	2.142–42.093	0.0004
HBV infection	negative	11(4.4)	1
HBV infection	positive	7(13.5)	3.352	1.233–9.108	0.013
Renal disease	negative	17(6.1)	1
Renal disease	positive	1(4.5)	0.731	0.093–5.766	0.765
Diabetes	negative	18(6.3)
Diabetes	positive	0(0)			1.00

Data are expressed as number and %
Abbreviations: Group U nerve block with ultrasound guidance, Group N nerve block with nerve stimulation-guidance, group M nerve block with combined guidance

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