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Deep brain stimulation (DBS) is an effective and established treatment for movement disorders, as well as an emerging treatment for psychiatric disorders. Outcome is influenced by many factors, including patient selection, electrode placement, stimulation parameters, hardware issues, oral medication adjustments, disease progression, and comorbidities. We present another potential complication following DBS surgery that is clinically important and probably underreported—the onset of a new functional movement disorder. In each of the 4 cases described (all of whom were treated at Toronto Western Hospital over a 15-year period), the correct diagnosis led to diagnostic counseling including demonstration of the presence and significance of positive functional signs to the patient. Patient 4 also had a short course of physiotherapy. Resolution of functional symptoms occurred within 3 months in all cases.
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Go to Neurology.org/N for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article.
- Received November 4, 2017.
- Accepted in final form February 12, 2018.
- © 2018 American Academy of Neurology
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