title: Dopaminergic medication unrelated myoclonus is less related to tremor in idiopathic Parkinson's disease.
abstract: Myoclonus in Parkinson's disease (PD) may be related or unrelated to dopaminergic medication and may share some features of cortical myoclonus. The aim of this study was to analyze clinical and electrophysiological correlates of the dopaminergic treatment unrelated myoclonus in PD patients. We included 17 PD patients with the end-of-dose myoclonus and 16 PD patients without myoclonus between January 2010 and June 2011. Surface electromyography of upper extremity muscles and long latency reflexes (LLRs) were performed. Positive or negative myoclonus with a duration of 35-100 ms was observed. Rest tremor was less frequent in the group with myoclonus. Only one PD patient with myoclonus had C reflex. Mean LLR amplitude was significantly high in PD with myoclonus compared to the group without myoclonus (p = 0.024). Dopaminergic treatment unrelated myoclonus is less related to rest tremor in PD, may be positive or negative, and exhibits similar features to cortical myoclonus.
authors.affiliation: Department of Neurology, Cerrahpaşa School of Medicine, Istanbul University, K.M.Pasa, 34098, Istanbul, Turkey. draysegulgunduz@yahoo.com.
authors.forename: Ayla
authors.initials: A
authors.lastname: Sifoglu
authors.affiliation: Department of Neurology, Cerrahpaşa School of Medicine, Istanbul University, K.M.Pasa, 34098, Istanbul, Turkey.
authors.forename: Aysegul
authors.initials: A
authors.lastname: Gunduz
authors.affiliation: Department of Neurology, Cerrahpaşa School of Medicine, Istanbul University, K.M.Pasa, 34098, Istanbul, Turkey.
authors.forename: Gunes
authors.initials: G
authors.lastname: Kiziltan
authors.affiliation: Department of Neurology, Cerrahpaşa School of Medicine, Istanbul University, K.M.Pasa, 34098, Istanbul, Turkey.
authors.forename: Meral E
authors.initials: ME
authors.lastname: Kiziltan
mesh_terms: D000368:Aged; D000978:Antiparkinson Agents / Q000627:therapeutic use*; D015259:Dopamine Agents / Q000627:therapeutic use*; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000187:drug effects / Q000503:physiopathology; D009207:Myoclonus / Q000188:drug therapy* / Q000503:physiopathology; D010300:Parkinson Disease / Q000188:drug therapy* / Q000503:physiopathology; D012018:Reflex / Q000187:drug effects / Q000502:physiology; D016896:Treatment Outcome; D014202:Tremor / Q000188:drug therapy* / Q000503:physiopathology; D034941:Upper Extremity / Q000503:physiopathology
chemical_list: D000978:Antiparkinson Agents; D015259:Dopamine Agents
keywords: C reflex; Levodopa; Long latency reflex; Myoclonus; Parkinson’s disease; Polymyography