Reversing the polarity of bipolar stimulation in deep brain stimulation for essential tremor : a theoretical explanation for a useful clinical intervention
Author
Yousif, Nada
Pavese, Nicola
Naushahi, Mohammad J
Nandi, Dipankar
Bain, Peter G
Attention
2299/19412
Abstract
The quadripolar electrodes used for deep brain stimulation are designed to give flexibility in contact configuration, optimize therapeutic effect, and minimize side-effects. A patient with essential tremor did not tolerate a bipolar setting due to the emergence of a pulling sensation in her face. However, when the polarity of the contacts was reversed, a 70% higher voltage was tolerated. Using an electric field model, we predicted that this effect was due to the proximity of the topmost contact to the internal capsule. Post-operative imaging supported this prediction. These results demonstrate how a multi-disciplinary approach allows us to optimize parameter settings.