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Published on: March 8, 2015
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Frequency-Dependent Inhibition during Deep Brain Stimulation of Thalamic Ventral Intermediate Nuclei
Zoe Paraskevopoulos1,2, Yupeng Tian1,2,3,4, David Crompton1,2
1Krembil Brain Institute, University Health Network, Toronto, Ontario M5T 1M8, Canada.
Summary
High-frequency deep brain stimulation (DBS) for essential tremor may involve network inhibition, not just cellular suppression. A transient burst in Vim neurons precedes inhibition, suggesting a balance of excitation and inhibition regulates DBS effects.
Area of Science:
- Neuroscience
- Neuron electrophysiology
- Brain stimulation
Background:
- Deep brain stimulation (DBS) of the thalamic ventral intermediate nucleus (Vim) is a standard essential tremor treatment.
- High-frequency DBS (≥100Hz) suppresses Vim firing, but mechanisms remain unclear.
- Investigating cellular vs. network effects in Vim DBS is crucial for optimizing therapy.
Purpose of the Study:
- To determine if neuronal suppression during high-frequency Vim DBS is cellular or network-driven.
- To elucidate the mechanisms underlying Vim neuronal activity changes during varying DBS frequencies.
- To identify novel biomarkers for optimizing DBS lead placement and evaluating network dynamics.
Main Methods:
- In vivo extracellular recordings of Vim neurons in humans during different DBS frequencies.
- Novel artifact removal techniques to characterize evoked-field potentials.
- Analysis of neuronal firing patterns and quasi-evoked inhibitory potentials.
Main Results:
- High-frequency Vim DBS induced a quasi-evoked inhibitory potential in some recording sites.
- Neuronal suppression was stronger in neurons exhibiting quasi-evoked inhibition.
- Quasi-evoked inhibition emerged after a transient burst, negatively correlating with firing rates.
Conclusions:
- High-frequency DBS may involve both synaptic depression and inhibitory neuron recruitment.
- A transient burst in Vim neurons might engage inhibitory networks during DBS.
- An excitatory-inhibitory balance likely regulates Vim activity during high-frequency DBS, offering insights for treatment optimization.
