Zakus P, et al. - This study tested a postulation that epidural catheter stimulation with a 1.0-msec pulse width versus a 0.1-msec pulse width would increase the incidence of bilateral motor response in parturients. Findings revealed that stimulation with pulse widths of 0.1 msec or 1 msec afforded similar and typically unilateral motor response pattern. Furthermore, it was noted that the threshold current is lower with the 1-msec pulse width stimulus.