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KMID : 0361419930170030341
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Journal of Korean Academy of Rehabilitation Medicine
1993 Volume.17 No. 3 p.341 ~ p.347
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Motor Evoked Potential in Bulbocavernosus Muscle using Magnetic Stimulation
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Abstract
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With the advent of a magnetic stimulator, we can more easily obtain motor evoked potential and more comprehensive information of the function of a peripheral and central somatic sensori-motor pathway to the bulbocavernosus muscles.
So in this study, bulbocavernosus reflex study and pudendal somatosensory evoked potential combined with motor evoked potential from the bulbocavernosus muscle by using magnetic stimulator, were carried out in neurologically normal adult male
with
the
purpose of providing a future guide for a integrated information for localizing the leveis of impaired neural conduction.
Following results were obtained from twenty four neurologically normal male studies. Motor evoked potential studies were recorded from the bulbocavernosus muscle after transcranial magnetic stimulation and sacral magnetic stimulation.
1) The mean total motor conduction time, peripheral and central motor conduction time were 21.8±2.5msec, 6.4±1.2msec and 15.4±2.9msec respectively and there were no significant differences in both sides.
2) The mean bulbocavernosus reflex latency and calculated efferent peripheral conduction time(EPCT) were 32.3±3.2 msec and 11.2±1.2msec individually, and al those showed no significant differences between right and left sides. And the mean
cortical
P40 potentials were 38.2±2.1msec.
3) The peripheral motor conduction time by sacral stimulation was shorter than the calculated efferent peripheral conduction time. These results suggested site of spinal nerves by magnetic stimulation was not the spinal cord but peripheral
nerves
or
roots.
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KEYWORD
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