title: Unilateral negative myoclonus caused by herpes simplex virus encephalitis.
abstract: Various neurologic manifestations of herpes simplex virus (HSV) encephalitis have been reported on the literatures. Chorea, ballism, choreoathetosis and myoclonus were reported as movement disorders which might be related with brain lesion by HSV encephalitis, but negative myoclonus (NM) has never been reported before. NM can be characterized as a shock-like involuntary jerky movement caused by a sudden, brief interruption of muscle activity. We experienced a case of HSV encephalitis with NM in unilateral arm and leg. In polygraphic monitoring, electroencephalography (EMG) silent periods are 50-250 ms in duration with no detectable EMG correlate.
authors.affiliation: Department of Neurology, Kyungpook National University School of Medicine, Daegu, Korea.
authors.forename: Jin-Mo
authors.initials: JM
authors.lastname: Park
authors.affiliation: Department of Neurology, Kyungpook National University School of Medicine, Daegu, Korea.
authors.forename: Jin-Sung
authors.initials: JS
authors.lastname: Park
authors.affiliation: Department of Neurology, Kyungpook National University School of Medicine, Daegu, Korea.
authors.forename: Yong-Won
authors.initials: YW
authors.lastname: Kim
authors.affiliation: Department of Neurology, Kyungpook National University School of Medicine, Daegu, Korea.
authors.forename: Ho-Won
authors.initials: HW
authors.lastname: Lee
authors.affiliation: Department of Neurology, Kyungpook National University School of Medicine, Daegu, Korea.
authors.forename: Da-In
authors.initials: DI
authors.lastname: Lee
authors.affiliation: Department of Neurology, Kyungpook National University School of Medicine, Daegu, Korea.
authors.forename: Sung-Pa
authors.initials: SP
authors.lastname: Park
authors.affiliation: Department of Neurology, Kyungpook National University School of Medicine, Daegu, Korea.
authors.forename: Hyun Seok
authors.initials: HS
authors.lastname: Song
keywords: Asterixis; Encephalitis; Herpes simplex virus; Negative myoclonus