Discharging The Magstim; Recording Of Evoked Responses - MAGSTIM 200 2 Operating Manual

2
Magstim 200

7.3 DISCHARGING THE MAGSTIM

7.4 RECORDING OF EVOKED RESPONSES

The Magstim Company Limited 3001-23-04
1. Check that the Magstim 200
default condition indicator is not illuminated, follow the instructions
detailed in Section 5 – Preparations for Use.
2. Set the output level on the instrument by rotating the OUTPUT
CONTROL knob until the desired level is displayed on the
OUTPUT % DISPLAY. It is recommended that 30% be used as a
starting point, gradually increasing, in 10% steps, until a response is
indicated.
3. Press the RUN key and the ARMED indicator will illuminate.
4. When the READY LED illuminates, it indicates that the instrument is
ready to discharge a magnetic pulse.
5. Hold the stimulating coil over the area to be stimulated. When using
nd
a standard 2 Generation Coil, pressing one, or both, of the safety
switches at the base of the stimulating coil will enable the armed
2
M200 , allowing it to be triggered either via the trigger button on the
unit – item 15 in Section 3 (front panel description) of this operating
manual, or the footswitch – item 3 in Section 4 (rear panel
description) of this operating manual. If a Remote Control Coil is
being used, depression of one of the safety switches will cause the
system to arm, depression of the second switch will trigger the
system.
6. A magnetic pulse can then be produced by depressing the TRIGGER
button (15), by depressing the footswitch, or by applying a Trigger
Input to the TRIGGER INPUT connector on the rear panel. An
internal click will sound and the READY LED will extinguish,
indicating that the Magstim has discharged. When the Magstim has
recharged to the set output power level the READY LED will
illuminate and the system is ready to be re-triggered.
The instrument will continuously discharge and recharge if the
TRIGGER key or foot switch is pressed and held, and the safety
switch on the coil is depressed.
In general the electrophysiological responses to magnetic stimulation can
be recorded using the same methods as for conventional electrical
stimulation. The recording instrument can be triggered from the
TRIGGER OUTPUT socket on the rear panel of the Magstim 200
Alternatively, the Magstim can be triggered by the recording equipment
via the TRIGGER INPUT socket on the rear panel of the Magstim.
2
is in the default condition. If the
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LUMENIS EX1091
Page 21
th
18 March 2005