Intraoperative Stimulation Test - Medtronic DBS 3387 Gebrauchsanweisung

Note: If an insertion cannula and stylet are used, the cannula should
be placed to a point approximately 10 mm proximal to the target site
for stimulation.
5. Determine target location with a test electrode.
a. Place the test electrode 10 mm above target. Slowly and
delicately advance it 1 mm at a time and test stimulate. Maximum
therapeutic effect with minimum side effects indicate the
appropriate target.
b. Once target is determined, document the location.
Note: It may be necessary to make additional tracks to achieve
optimum lead placement.
6. Remove the test electrode. Determine the depth of placement for the
DBS Lead.
7. Attach the lead depth stop gauge on the lead at the point calculated
in step 6.
8. Advance the lead along the track made by the test electrode.
Caution: An increase in resistance or friction during lead insertion
may indicate that the lead is deviating from the intended track. If this
occurs, pull the lead back and re-advance until target is reached.

Intraoperative Stimulation Test

This section outlines the intraoperative stimulation test that helps confirm
the desired lead position for optimum symptom suppression. This test
requires the following components:
A Model 3625 Test Stimulator
■
An alligator clip or twist-lock screening cable.
■
The procedures outlined in this section provide instructions for test
stimulation with the alligator clip or twist-lock screening cable and the
Model 3625 Test Stimulator.
Test Stimulation with the Alligator Clip Screening Cable
The alligator clip screening cable is bipolar. The polarity of the black
alligator clip is controlled by Electrode Switch '0', and the red alligator clip
is controlled by Electrode Switch '3'. Electrode Switches '1' and '2' are
inactive. Use the alligator clips to select the lead contacts that correspond
to the electrodes you want to test.
Caution: The switches on the 3625 Test Stimulator corresponding to
electrodes '0' and '3' must be manually set to establish a circuit. One switch
must be positive and the other switch negative. If the '0' and '3' electrode
switches are not set accordingly, no stimulation will result.
1. Attach the alligator clips to the applicable lead contacts that
correspond to the desired electrodes — Figure 1 illustrates the
connection to the lead contacts for electrodes 0 and 3.
20 English Technical Manual