Deep brain stimulation (DBS) has been applied mainly for the treatment of intractable pain and involuntary movement disorders. Based on the rising numbers of patients undergoing DBS therapy, the possibility of emergent application of cardioversion for the treatment of occasional severe arrhythmia in DBS patients has also increased. However, there has been insufficient discussion about cardioversion in DBS patients. We employed a radiofrequency receiver that transmits to the brain impulses provided by an external generator through an antenna applied to the skin in front of the receiver. We experienced a patient who displayed almost complete cessation of his action tremor with thalamic stimulation. He also developed central dysesthetic pain and showed complete disappearance of his action tremor, even without stimulation, following successful application of cardioversion. It is considered that slight changes in the high-voltage electrical current or high-voltage electrical current spread induced central dysesthetic pain and almost identical effects to thalamotomy. We report for the first time a case of thalamotomy induced by cardioversion in a DBS patient. Clearly, we need to bear in mind that cardioversion has the capability to cause brain lesions in DBS patients with a radiofrequency receiver implanted subcutaneously at the anterior chest wall.

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