MAGSTIM 200 2 Operating Manual page 20

2
Magstim 200
The Magstim Company Limited 3001-23-04
of muscles in the body allowing for the functional assessment of motor
pathways. In the case of the MAGSTIM the discharge current in the
stimulating coil and the resulting magnetic pulse is mono-phasic allowing
for mono-hemispheric stimulation.
To record the best responses from muscles in the right side of the body
always place the coil such that Side A is visible to the operator and Side
B is touching the subject. To record the best response from the left side of
the body always place the coil such that Side B is visible to the operator.
The above rules should be observed when stimulating the motor cortex or
the spinal nerve roots.
The induced stimulating current flows clockwise under the coil winding
when viewing Side A and counter-clockwise when viewing Side B. Since
the motor cortex is more sensitive to current flowing from posterior to
anterior, clockwise induced current primarily stimulates the left motor
cortex and counter-clockwise induced current stimulates the right motor
cortex.
When recording from muscles in the arms and hands position the
Standard 90mm Coil centrally on the vertex. In the case of circular coils
Stimulation takes place under the winding and not under the coil centre.
When recording from muscles in the lower limbs move the Standard
90mm Coil forward from the vertex and contra lateral to the target muscle
by approximately 5cms (2 inches) each way such that part of the coil
winding lies over the central fissure.
18
LUMENIS EX1091
Page 20
th
18 March 2005