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Evaluation of proximal facial nerve conduction by transcranial magnetic stimulation.
- Source :
- Journal of Neurology, Neurosurgery & Psychiatry; Jan1988, Vol. 51 Issue 1, p60-66, 7p
- Publication Year :
- 1988
-
Abstract
- A magnetic stimulator was used for direct transcutaneous stimulation of the intracranial portion of the facial nerve in 15 normal subjects and in patients with Bell's palsy, demyelinating neuropathy, traumatic facial palsy and pontine glioma. Compound muscle action potentials (CMAPs) thus elicited in the orbicularis oris muscle of controls were of similar amplitude but longer latency (1.3 SD 0.15 ms) compared with CMAPs produced by conventional electrical stimulation at the stylomastoid foramen. No response to magnetic stimulation could be recorded from the affected side in 15 of 16 patients with Bell's palsy. Serial studies in two patients demonstrated that the facial nerve remained inexcitable by magnetic stimulation despite marked improvement in clinical function. In the patient with a pontine glioma, the CMAP elicited by transcranial magnetic stimulation was of low amplitude but normal latency. In six of seven patients with demyelinating neuropathy, the response to intracranial magnetic stimulation was significantly delayed. Magnetic stimulation produced no response in either patient with traumatic facial palsy. Although the precise site of facial nerve stimulation is uncertain, evidence points to the labyrinthine segment of the facial canal as the most likely location. [ABSTRACT FROM AUTHOR]
- Subjects :
- ELECTRIC stimulation
BRAIN tumors
BRAIN stem
COMPARATIVE studies
DEMYELINATION
EVOKED potentials (Electrophysiology)
FACIAL nerve
FACIAL paralysis
GLIOMAS
RESEARCH methodology
MEDICAL cooperation
NEURAL conduction
GUILLAIN-Barre syndrome
REACTION time
RESEARCH
TRANSCRANIAL magnetic stimulation
EVALUATION research
BLINKING (Physiology)
EQUIPMENT & supplies
WOUNDS & injuries
Subjects
Details
- Language :
- English
- ISSN :
- 00223050
- Volume :
- 51
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Journal of Neurology, Neurosurgery & Psychiatry
- Publication Type :
- Academic Journal
- Accession number :
- 66121394