Motor Evoked Potentials by Transcranial Magnetic Stimulation.
- Author:
Se Hyuck PARK
1
;
Kyu Ho LEE
Author Information
1. Department of Neurosurgery, Kangdong Sungshim Hospital, College of Medicine, Hallym University, Korea.
- Publication Type:Original Article
- Keywords:
Transcranial magnetic stimulation;
Motor cortex;
Motor evoked potential;
Facilitation;
Central motor pathway
- MeSH:
Action Potentials;
Diagnosis;
Efferent Pathways;
Electric Stimulation;
Evoked Potentials, Motor*;
Hand;
Humans;
Magnetic Fields;
Motor Cortex;
Scalp;
Sensation;
Shock;
Transcranial Magnetic Stimulation*
- From:Journal of Korean Neurosurgical Society
1990;19(1):108-115
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
The human motor cortex can be stimulated by electric shock or by brief intense magnetic fields. Transcranial magnetic stimulations(TCMS) cause only a trivial scalp sensation, compared with electrical stimulations. TCMS caused contralateral hand muscle responses and the resultant compound muscle action potentials or motor evoked potentials can be recorded. Central motor conduction time(CMCT) can be estimated by stimulating over the scalp and over the cervical area. In healthy subjects, the CMCT is 10.3+/-1.8ms(n=70 sides). Facilitation of responses in hand muscle is produced by voluntary contraction and the overall latency from scalp to hand muscle is shorter by 2.4ms(n=24 sides). TCMS is a non-invasive method to evaluate the central motor pathways and inaccessable portion of the peripheral pathways and so it has important implications not only for the diagnosis of disorders in the central motor pathways but also for evaluating treatments.
