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Correlation between MRI-based stereotactic thalamic deep brain stimulation electrode placement, macroelectrode
F Mobin1, A A De Salles, E J Behnke
1Department of Neurosurgery, School of Medicine, University of California, Los Angeles, California 95817, USA. FMobin@pol.net
Stereotactic and Functional Neurosurgery
|June 15, 2000
Summary
Thalamic deep brain stimulation (DBS) effectively reduced tremor in Parkinson's disease and essential tremor patients. Adjusting stimulation settings compensated for electrode placement variations, offering a flexible treatment.
Area of Science:
- Neurosurgery
- Neurology
- Biomedical Engineering
Background:
- Deep brain stimulation (DBS) is a therapeutic option for movement disorders.
- Accurate electrode placement is crucial for effective thalamic DBS targeting the Vim nucleus.
Purpose of the Study:
- To compare the actual position of the active contact in thalamic DBS electrodes with the planned stereotactic target.
- To assess the clinical efficacy of thalamic DBS in patients with Parkinson's disease (PD) and essential tremor (ET).
Main Methods:
- Stereotactic, MRI-based placement of Medtronic quadripolar DBS electrodes in 15 patients (PD/ET).
- Analysis of electrode tip position relative to anatomical landmarks (e.g., third ventricle, AC-PC line).
- Evaluation of tremor score improvement at 1-13 months post-implantation.
Main Results:
- Overall tremor score improvement of 69% (70% in ET, 58% in PD).
- Significant deviation in the Z-coordinate (inferior-superior) of electrode tip placement.
- Stimulation settings favoring lower contacts corrected the effective position to 0.80 +/- 2.84 mm inferior to the AC-PC line (p < 0.001).
Conclusions:
- Thalamic DBS provides significant tremor reduction in PD and ET patients.
- Anatomical variabilities in electrode placement can be compensated by adjusting stimulation parameters.
- Thalamic DBS acts as a reversible and adjustable 'lesion' to manage positional inaccuracies.