Table 2.

The outcomes for the electrical stimulation

	N = 26
The minimum electric current (mA)used to evoke paresthesia or muscle contraction	1.06 ± 0.36
The number of cases which required catheter reposition	6 (23)
Cases with unilateral response	16 (62)
Success	13 (81)
Partial success	3 (19)
Failure	0 (0)
Cases with bilateral response	10 (38)
Success	8 (80)
Partial success	1 (10)
Failure	1 (10)

Values are either the mean ± SD or the number of patients (%). A total of 26 patients in the group E were confirmed the responses to electrical stimulation