T he vast amount of work produced by David Marsden, Stanley Fahn, and many other investigators in the 1980s and 1990s established the movement disorders as one of the most active and exciting contemporary areas of Neurology. Since its inception in the 19 th century, thanks to the groundbreaking contribution of Jean Martin Charcot, William Gowers, Sir William Osler, among others, this area has been perceived as the realm of chronic and relentlessly progressive disorders, whose care is provided in the setting of outpatient clinics. Recently, there is a growing understand that movement disorders may present with acute problems warranting visits to the emergency rooms. Thus, the comprehensive review of Munhoz et al. on movement disorders emergencies in the current issue of Arquivos de Neuropsiquiatria is timely 1 . The authors tackled etiology, clinical features, and management of a vast gamut of emergencies in patients with movement disorders.In addition to clinical problems related to hyperkinetic and hypokinetic movement disorders in adults reviewed by the authors, there are two issues that should receive the attention of neurologists interested in this field. At least 8% of patients with Parkinson's Disease (PD) and a small, but growing number, of individuals with tremor, dystonia, and other hyperkinetic disorders fail to respond to clinical management. With new advances in functional surgery, many of these subjects are candidates for deep brain stimulation (DBS).As recently reviewed by Morishita et al.
2, more postoperative urgencies and emergencies have emerged. The authors have separated the scenarios into surgery/procedure related (intracranial hemorrhage, dyskinetic storm, postoperative behavioral and cognitive problems, suicide attempt or ideation, others), hardware related (hardware infection, hardware malfunction, lead migration, and lead misplacement), stimulation-induced difficulties (motor or non-motor symptoms), and others. Given their complexity, patients with these movement disorders emergencies should be referred to units where there is a staff comprising neurologists and neurosurgeons experienced with DBS. The second issue is related to pediatric movement disorders. In comparison to adult patients, much less has been published about emergencies in this population. However, a recent review by Kirkham et al. sheds light on this topic 3 . They described 52 patients, and three groups were recognized: psychogenic disorders (n=12), typically >10 years-old, more likely to be female and to have tremor and myoclonus 2 . Inflammatory or autoimmune disorders (n=22), including N-methyl-d-aspartate receptor encephalitis, opsoclonusmyoclonus, Sydenham's chorea, systemic lupus erythematosus, acute necrotizing encephalopathy, and other encephalitis and 3 non-inflammatory disorders (n=18), including drug-induced movement disorder, postpump chorea, metabolic, e.g. glutaric aciduria, and vascular disease, e.g. moyamoya. It noteworthy that, unlike series with adult subjects, there was a significant representation of...