Healthy Clinical Trial
Official title:
Stimulation of the Human Central and Peripheral Nervous System With a Magnetic Stimulator
Transcranial Magnetic Stimulation (TMS) is a non-invasive technique to gather information
about brain function. It is very useful when studying the areas of the brain related to
motor activity (motor cortex, corticospinal tract, spinal cord and nerve roots). The
procedure is conducted by transmitting a magnetic signal into the brain to stimulate an area
of the body. Electrodes (small pieces of metal taped to areas of the body) are used in order
to measure electrical activity. A magnetic signal is sent from a metal instrument held close
to the patient's head, to an area of the brain responsible for motor activity of a certain
area of the body. The electrodes pick up and record the electrical activity in the muscles.
This study will employ the use of TMS to diagnose neurological disorders that affect the
motor cortex or the corticospinal tract. Normal subjects are sometimes studied to
investigate normal activity of the nervous system and to train doctors in clinical
neurophysiology and electrodiagnostic medicine at the National Institutes of Health (NIH).
This protocol outlines the use of magnetic stimulation as a diagnostic tool in patients with
suspected dysfunction of central motor pathways or nerve roots and as a tool to localize and
characterize suspected corticospinal abnormalities in neurologic disorders and systemic
disorders with neurological manifestations. The protocol is intended for clinical use.
Transcranial magnetic stimulation has been used for diagnosis of neurologic disorders since
1987. The principles of magnetic stimulation and its use for diagnosis are described in
current textbooks of clinical neurophysiology as a routine procedure and should be included
in the training program for fellows in clinical neurophysiology and electrodiagnostic
medicine at NIH.
The magnetic stimuli are to be given as single or paired pulses at repetition rates less
than 1 per second.
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