Table 4.

Root- and nerve-muscular evoked potentials (r/nm-EP)

Stimulation	Bi- or monopolar stimulator	Stimulus (cathode)	ISI	Intensity	Duration	Rate of repetition
Root, nerve	Screw, tumour, ...	Repeated single stimuli	–	0.5–30 mA	0.2 ms	5.9/s

Recording	Electrodes	Potential	Filters	Sensitivity	Sweep	Averaging
Muscles of interest, synchronous	2 surface electrodes/muscle	CMAP	0.05–3 kHz	0.05 mV/D	10 ms/D	2–10