User Manual ToFscan
11
II ToFscan setup
Cable / Cable connection
The user connects the electrode cable to the ToFscan prior to use. The user will
make sure sensor symbol is displayed in green
on the right side of the screen after this cable
is connected to the ToFscan. If the operator is using a standard cable, the grey symbol
should
be displayed in grey on the screen.
Electrodes
The ToFscan must be connected only to surface electrodes by “press-on” connection. The
electrodes must be electrodes used for electrical stimulation of patients. They should be compatible
with the stimulation values currently used by a NeuroMuscular Transmission Monitor.
Positioning of the electrodes
NMT blockade may be monitored by stimulating various nerves and observing the
response of the particular muscles.
In the case of continuous monitoring, the most commonly used technique is considered
to be stimulation of the ulnar nerve and measurement of acceleration in the adductor muscle of the
thumb.
“Thumb” sensor:
In the case of monitoring the adductor muscle of the thumb (adult or paediatric sensor), the
electrodes will be positioned along the ulnar nerve on the inner arm near the wrist. The electrodes will
be spaced 2 to 5 cm (1 to 2 inches) apart when using single electrodes.
Note:
It is vital to position the electrodes properly in order to stimulate the nerve and not the
muscle.
Position of the sensor and the electrodes:
Positioning of the
electrodes
(example using a double
electrode)
“Eyebrow” sensor
With the « eyebrow » sensor, it is possible to evaluate the level of blockade of the patient
while measuring the response level of the corrugator supercilli muscle.
The stimulation electrodes are to be positioned on the root of the facial nerve next to
the tragus. The positioning will be done on each side of an imaginary line going from the tragus
extremity to the middle of the nose. The distance between the electrodes will range from 2 to 5 cm
(1 to 2 inches).
Note:
It is essential to correctly position the electrodes in order to stimulate a nerve and not a muscle.
Electrodes positioning
to stimulate the facial nerve
