Table 1
Summary of the Side Effect Thresholds in the Monopolar Survey for the Bilateral Vim Performed 2 Months after left Vim Implantation
| Contact Tested | Side Effect Threshold (V) | Side Effect Noted |
|---|---|---|
| Left Vim | ||
| 0 | 0.7 | Tingling of right hand |
| 1 | 0.7 | Tingling of right fingertips |
| 2 | 0.9 | Tingling of right lip and first and second fingers |
| 3 | 1.7 | Tingling of right face and right hand with slurring of speech |
| Right Vim | ||
| 8 | 1.5 | Tingling of left hand |
| 9 | 1.4 | Tingling of left fingertips and lips |
| 10 | 2 | Tingling of left lip and slurring of speech |
| 11 | 3 | Tingling of lips and slurring of speech |
Figure 1
Postoperative Lead Location Mapping. The dashed red line is the location of the deep brain stimulation lead based on comouted tomography–magnetic resonance imaging fusion. The green structure the lead touches is the thalamus. The red structure beneath the thalamus is the subthalamic nucleus. Coordinates for right thalamic ventralis intermedius (Vim), 3.9 mm posterior; 12.8 mm lateral; and 2.2 mm inferior to the midcommissural point. Coordinates for left Vim, 5.7 mm posterior; 13.2 mm lateral; and 3.7 mm inferior to the midcommissural point.
Table 2
Summary of Relevant Programming Sessions with Therapeutic Impedance Measurements
| Since Left Vim Insertion | Cathode | Anode | Voltage (V) | Pulse Width (μs) | Frequency (Hz) | Current (A) | Therapeutic Impedance (ohm) |
|---|---|---|---|---|---|---|---|
| 2 months | 2 | 3 | 0.8 | 90 | 180 | 0.186 | High (>4000) |
| 2 months | 2 | 3 | 1 | 90 | 135 | 0.237 | High |
| 3 months | 2 | 3 | 1 | 90 | 135 | 0.183 | High |
| 4 months | 2 | 3 | 1.2 | 90 | 150 | 0.222 | High |
| 4 months | 2 | 3 | 1.4 | 60 | 180 | N/A | High |
| 5 months | 2 | 3 | 1.8 | 60 | 180 | 0.458 | High |
| 7 months | 2 | 3 | 1.9 | 60 | 135 | 0.622 | 3154 |
| Lead integrity impedance | C-0, 1317; C-1, 1342; C-2, 1348; C-3, 1391; 0-1, 2518; 0-2, 2813; 0-3, 2870; 1-2, 2728; 1-3, 2891; 2-3, 2667 | ||||||
