Evoke
®
SCS System Clinical Manual
CLIN-UMAN-005175
Revision: 9.00
Page 55 of 101
c.
For fixed distance recordings, the reference electrode is typically placed 2 or 3
electrodes from the measurement electrode.
A.
B.
Figure 7.13 Example starting electrode positions for:
A.
Fixed reference recordings;
B.
Fixed distance recordings.
6.
Touch Continue.
7.
Touch the
direction
icon
for the direction that the measurement electrode
should move.
8.
Start stimulation with closed-loop disabled and touch
Continue
.
9.
Ask the patient to remain still for the duration of the test, then increase the current until
the patient reports that the stimulation is at the maximum level (M; can tolerate for
approximately 1 minute). Then reduce the current until the patient reports it has
returned to a comfortable level (C+).
10.
Touch
Continue
to begin data collection.
11.
After completion of the measurements, reset the electrode configuration to the
patient’s settings.
12.
Touch the
Cancel
button to close the neurophysiological measurements menu.
13.
Use the CDV to calculate conduction velocity using the data that was collected. Refer to
Evoke SCS System Clinical Data Viewer User Manual for instructions.
7.8.4
Lead offset measurement
Collect data to automatically estimate the vertical alignment of the implanted leads. The lead
offset measurement will report the vertical distance in electrode spacings and millimeters that
the electrode leads are mismatched.