Fig. 2.

Overlapping of threshold charges and current. (A) The distribution of threshold charges of the 34 patients is shown. (B) Scattergram showing the threshold current of the 34 patients. Both solid and vacant circles are ERmA for motor contraction with pulse width 0.3 ms. In regard to EDmA, solid circles are EDmA for motor contraction with pulse width 0.3 ms, while vacant circles are EDmA with pulse width 1.0 ms. Line a and b denote the threshold charges of 0.3 nC in (A) or threshold current 1.0 mA with a pulse width of 0.3 ms in (B). ERnC/EDnC and ERmA/EDmA are the threshold charges and current of motor response, respectively. ER and ED denote epiradicular and epidural, respectively.