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Using magnetoencephalography to investigate brain activity during high frequency deep brain stimulation in a cluster
Nj Ray1, Ml Kringelbach, N Jenkinson
1Department of Physiology, Anatomy and Genetics, University of Oxford, UK.
Purpose:
Treatment-resistant cluster headache can be successfully alleviated with deep brain stimulation (DBS) of the posterior hypothalamus [1]. Magnetoencephalography (MEG) is a non-invasive functional imaging technique with both high temporal and high spatial resolution. However, it is not known whether the inherent electromagnetic (EM) noise produced by high frequency DBS is compatible with MEG.
Materials And Methods:
We used MEG to record brain activity in an asymptomatic cluster headache patient with a DBS implanted in the right posterior hypothalamus while he made small movements during periods of no stimulation, 7 Hz stimulation and 180 Hz stimulation.
Results:
We were able to measure brain activity successfully both during low and high frequency stimulation. Analysis of the MEG recordings showed similar activation in motor areas in during the patient's movements as expected. We also observed similar activations in cortical and subcortical areas that have previously been reported to be associated with pain when the patient's stimulator was turned on or off [2,3].
Conclusion:
These results show that MEG can be used to measure brain activity regardless of the presence of high frequency deep brain stimulation.
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