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Do directional deep brain stimulation leads rotate after implantation?

Marie Krüger, Yashar Naseri, Fabian Cavalloni, Peter C Reinacher, Georg Kägi, Johannes Weber, Deborah Brogle, Oliver Bozinov, Stefan Hägele-Link & Florian Brugger

abstract

BACKGROUND
The two middle contacts of directional leads (d-leads) for deep brain stimulation are split into three segments, allowing current steering toward desired axial directions. To facilitate programming, their final orientation needs to be reliably determined. However, it is currently unclear whether d-leads rotate after implantation. Our objective was to assess the degree of d-lead rotation after implantation.

METHODS
We retrospectively analyzed d-lead orientation on intraoperative X-rays, postoperative CT scans (latencies to surgery: 108-189 min postoperatively), and rotational fluoroscopies (4-9 days postoperatively) for a consecutive series of 32 implanted d-leads. For five d-leads, a CT scan with a mean follow-up of 57 days (range 28-182) was available. All d-leads were implanted with the marker facing anterior and the intention to hit an "iron sight" (ISi) on the X-ray, indicating anterior orientation (i.e., 0° ± 6°).

RESULTS
In nine d-leads, an ISi was visible on the final X-ray; median orientation was 1.5° (range 0.5-6.0°) at the first follow-up CT, confirming anterior orientation. In d-leads without ISi or where ISi was not evaluable, the median rotation was 15.5° (9.5-35.0°) and 26.5° (5.5-62.0°), respectively. The orientation of the initial CT was comparable with the orientation determined by the postoperative rotational fluoroscopy and second CT in all d-lead groups.

CONCLUSION
D-lead orientation does not change within the first week after implantation. We provide first indications that d-lead orientation remains stable for several weeks after surgery. Determination of lead orientation using marker-based X-ray alone seems too imprecise; adding the ISi method can increase determination of intraoperative orientation.
   
citation Krüger M, Naseri Y, Cavalloni F, Reinacher P C, Kägi G, Weber J, Brogle D, Bozinov O, Hägele-Link S, Brugger F. Do directional deep brain stimulation leads rotate after implantation?. Acta Neurochir (Wien) 2020; 163:197-203.
   
type journal paper/review (English)
date of publishing 11-09-2020
journal title Acta Neurochir (Wien) (163/1)
ISSN electronic 0942-0940
pages 197-203
PubMed 32915306
DOI 10.1007/s00701-020-04568-3