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Probabilistic Mapping Reveals Optimal Stimulation Site in Essential Tremor
Andreas Nowacki1, Sabry Barlatey1, Bassam Al-Fatly2
1Department of Neurosurgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.
Annals of Neurology
|February 12, 2022
Summary
This study mapped optimal deep brain stimulation (DBS) sites for essential tremor (ET) by analyzing patient data. The findings identified a key stimulation area along the cerebellothalamic tract (CTT) for improved tremor control.
Area of Science:
- Neurosurgery
- Neurology
- Medical Imaging
Background:
- Essential tremor (ET) is a debilitating neurological disorder.
- Deep brain stimulation (DBS) is an effective treatment for refractory ET.
- Identifying optimal DBS targets and predicting outcomes remain challenging.
Purpose of the Study:
- To identify predictors of outcome in ET patients undergoing DBS.
- To determine an optimal stimulation site for DBS in ET.
- To create a probabilistic stimulation map for ET DBS.
Main Methods:
- Retrospective analysis of clinical and neuroimaging data from 119 ET patients across 5 European centers.
- Calculation of individual electrode positions and stimulation volumes.
- Voxel-wise statistical analysis to create a probabilistic stimulation map and train a predictive classifier.
Main Results:
- A statistically significant cluster associated with >50% tremor improvement was identified.
- This optimal stimulation area extended from the posterior subthalamic area to the ventralis intermedius nucleus, coinciding with the cerebellothalamic tract (CTT).
- A predictive model using distance to the cluster and CTT activation achieved 89% sensitivity and 57% specificity for predicting >50% tremor improvement.
Conclusions:
- A multicenter probabilistic stimulation map for ET DBS identified an optimal stimulation area along the CTT.
- This map may guide surgical planning and computer-assisted programming of DBS.
- Further prospective validation is needed to confirm these descriptive findings.
