• Christos Sidiropoulos, Tiago Mestre, William Hutchison, Elena Moro, Alejandro Valencia, Y Y Poon, Melanie Fallis, Anand I Rughani, Suneil K Kalia, Andres M Lozano, and Anthony E Lang.
• Movement Disorders Centre and the Edmond Safra Program in Parkinson's Disease, Toronto Western Hospital, 399 Bathurst Str., Toronto, Ontario, Canada M5T 2S8; Parkinson's Disease and Movement Disorders Program, Henry Ford Hospital, 6777 West Maple Road, West Bloomfield, MI, USA; Department of Physiology, University of Toronto, Toronto Western Hospital, 399 Bathurst St, Toronto, Ontario, Canada M5T 2S8. Electronic address: csidiro1@hfhs.org.
• Parkinsonism Relat. Disord. 2014 Aug 1;20(8):915-8.

AbstractWe report on the clinical efficacy of bilateral globus pallidus internus deep brain stimulation in two patients with myoclonus dystonia/essential myoclonus who lack mutations in the epsilon sarcoglycan gene. The primary outcome measures were the Burke-Fahn-Marsden Dystonia Scale motor severity and the Unified Myoclonus Rating Scale scores, and the secondary outcome measure was the 36-item Short Form Health Survey score at the last postoperative follow up. Neuronal firing rates were also calculated from microelectrode recordings. At the last postoperative follow-up (16 weeks for Patient 1 and 18 weeks for Patient 2), there was 57.1% (Patient 1) improvement in the Burke-Fahn-Marsden Dystonia Scale motor severity score and 31.3% (Patient 1) and 69% (Patient 2) in the Unified Myoclonus Rating Scale score while individual SF-36 scores showed improvement in most subdomains. Bilateral globus pallidus internus deep brain stimulation can be effective in ameliorating epsilon sarcoglycan negative myoclonus with or without concurrent dystonia. Whether an epsilon sarcoglycan negative status represents a less favorable prognostic factor for pallidal deep brain stimulation remains to be elucidated.Copyright © 2014 Elsevier Ltd. All rights reserved.

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