Table 2.

Tests applied in the patient population (n = 109) with spinal tumors

Monitoring modality	Monitorings applied		Baseline recordings
	Out of 109 cases	Mean tests* per patient	normal potential	abnormal potential	no potentials
cm-EP	108 (99%)	2.7	40	68	0
sm-EP	22 (20%)	2.9	22 (NVM*)		0
cs-EP	67 (61%)	1.2	24	37	6
ss-EP	15 (14%)	1	15 (NVM)		0
nc-EP	99 (91%)	1.5	36	62	1
ns-EP	55 (50%)	1.5	55 (NVM)		0
BCR, BAR	15 (14%)	1	15 (NVM)		0
AEP	1 (1%)	2	1	0	0
EMG	91 (83%)	2.7	No spontaneous activity

^aTests: recorded muscle pairs or stimulated nerve pairs in a given modality

cm-EP cerebro-muscular evoked potentials, cs-EP cerebro-spinal evoked potentials, ns-EP neuro-spinal evoked potentials, nc-EP neuro-cerebral evoked potentials, sm-EP spino-muscular evoked potentials, ss-EP spino-spinal evoked potentials, BCR bulbo-cavernous reflex, BAR bulbo-anal reflex, NVMnormative value missing