Figure 1
A, BenGun configuration. B, a representation of the DBS lead being placed in one of the off-center channels of the BenGun while the MER canula is held in place. DBS, deep brain stimulation; GPi, globus pallidus interna; GPe, globus pallidus externa.
Table 1
Thresholds for stimulation-induced side effects recorded in the operating room (OR) and again in the clinic about 4 weeks later. There was an expected observed decrease in the current required to generate side effects following resolution of peri-lead edema and when using the actual final DBS lead.
| THRESHOLDS IN THE OR | THRESHOLDS IN THE CLINIC | |
|---|---|---|
| Contact 0 | 3 mA (dysesthesia) | 2.5 mA (dysesthesias) |
| Contact 1 | 4.5 mA (face and hand contraction) | 3 mA (face contraction) |
| Contact 2 | 4.5 mA (hand contraction) | 3.5 mA (hand contraction) |
| Contact 3 | 5 mA (hand contraction) | 4 mA (hand contraction) |
Figure 2
A, B, C: Different cuts of CT scan done immediately after lead implantation. There is significant left frontal pneumocephalus leading to brain shift in the posterior and medial direction. D: Resolved pneumocephalus at a four-weeks interval.
Figure 3
Lead reconstruction of the left GPi DBS lead. The red lead represents the reconstruction performed using the intraoperative CT, when the pneumocephalus and brain shift were present. The green lead represents the reconstruction performed using the post-operative CT (around 1 month later) following resolution of the pneumocephalus and brain shift. A, provides an axial section of a brain MRI collected using the FGATIR sequence. B and C, provide 3D reconstructions of the DBS lead in the left GPi (figure for orientation in the lower left).