title: Failure of chronic pallidal stimulation in dystonic patients is a medical emergency.
abstract: Deep brain stimulation (DBS) therapy is a continually expanding field of functional neurosurgery for the treatment of movement disorders and neuropathic pain. However, occurrence of adverse events related to implanted hardware cannot be ignored, particularly in patients with dystonic conditions. We report on two such patients who required emergency hospital admission and pulse generator re-implantation following sudden and unexpected cessation of DBS effectiveness resulting from battery failure.
authors.affiliation: The Oxford Movement Disorder Group, Department of Neurological Surgery, The Radcliffe Infirmary, Oxford;              Division of Neurosciences and Psychological Medicine, Imperial College School of Medicine, Charing Cross Hospital Campus;              University Department of Physiology, Oxford University, Oxford, United Kingdom.
authors.forename: John
authors.initials: J
authors.lastname: Yianni
authors.forename: Dipankar
authors.initials: D
authors.lastname: Nandi
authors.forename: M
authors.initials: M
authors.lastname: Ch
authors.forename: Jonathan
authors.initials: J
authors.lastname: Hyam
authors.forename: Vanessa
authors.initials: V
authors.lastname: Elliott
authors.forename: Peter
authors.initials: P
authors.lastname: Bain
authors.forename: Ralph
authors.initials: R
authors.lastname: Gregory
authors.forename: Tipu
authors.initials: T
authors.lastname: Aziz