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Variations in Thalamic Anatomy Affect Targeting in Deep Brain Stimulation for Epilepsy
Chengyuan Wu1, Pierre-François D'Haese, Srivatsan Pallavaram
1Division of Epilepsy and Neuromodulation Neurosurgery, Department of Neurosurgery, Thomas Jefferson University, Philadelphia, Pa., USA.
Stereotactic and Functional Neurosurgery
|November 16, 2016
Summary
Thalamic size variations impact deep brain stimulation (DBS) electrode placement for epilepsy. Electrode position trends suggest potential links to treatment response, highlighting the need for precise targeting.
Area of Science:
- Neurosurgery
- Neurology
- Medical Imaging
Background:
- Thalamic size and shape exhibit significant inter-patient variability.
- Anterior thalamic anatomy changes with age and in chronic epilepsy patients.
- Variations raise concerns for electrode placement accuracy and seizure outcome in deep brain stimulation (DBS).
Purpose of the Study:
- To quantitatively analyze thalamic dimensions and electrode positions in epilepsy patients.
- To investigate the relationship between thalamic anatomy, electrode location, and seizure outcomes.
- To identify factors influencing the efficacy of DBS for epilepsy.
Main Methods:
- Quantitative analysis of MRIs from 6 epilepsy patients.
- Normalization of electrode positions using the CRAnialVault Explorer suite.
- Analysis of correlations between thalamic dimensions, normalized electrode locations, and seizure outcomes.
Main Results:
- A trend towards smaller thalamic volumes was observed in patients who did not respond to treatment.
- Normalized electrode locations showed greater variation in non-responders.
- Non-responders tended to have more lateral, posterior, and inferior electrode placements.
Conclusions:
- Thalamic anatomical variations necessitate precise targeting for DBS in epilepsy.
- Age- and epilepsy-related thalamic changes require advanced visualization and targeting methods.
- Thalamic atrophy may indicate poor prognosis and hinder electrode placement, underscoring the need for better anatomical understanding.
