TY - JOUR
T1 - Myoclonus subtypes in tertiary referral center. Cortical myoclonus and functional jerks are common
AU - Zutt, R.
AU - Elting, J. W.
AU - van der Hoeven, J. H.
AU - Lange, F.
AU - Tijssen, M. A. J.
N1 - Copyright © 2016 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.
PY - 2017/1
Y1 - 2017/1
N2 - Objective: To evaluate the accuracy of clinical phenotyping of myoclonus patients and to determine differentiating clinical characteristics between cortical (CM), subcortical (SCM), spinal (SM), peripheral (PM) myoclonus, and functional jerks (FJ).Methods: Clinical notes for all patients with myoclonus over an 8-year period (2006-2014) were reviewed retrospectively. We used the conclusion of electrophysiological testing as definite diagnosis of myoclonus or FJ.Results: 85 patients were identified suffering from CM (34%), SCM (11%), SM (6%), PM (2%), and 47% FJ. The clinical diagnosis of myoclonus was confirmed by electrophysiological testing in 74% and its subtype in 78% of cases. CM was characterized by an early age of onset, facial myoclonus, and provocation by action. Differentiating features of FJ were an abrupt onset, preceding contributing events and provocation by a supine position.Conclusion: The majority of clinical myoclonic jerk cases were functional in our heterogeneous tertiary clinic cohort. CM was the main anatomical myoclonic subtype. Clinical diagnosis was accurate in the majority of cases, although electrophysiological testing was important to verify the clinical classification. Significance: In patients with jerky movements a functional diagnosis should be considered. Determination of the myoclonic subtypes is important to initiate tailored treatment. (C) 2016 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.
AB - Objective: To evaluate the accuracy of clinical phenotyping of myoclonus patients and to determine differentiating clinical characteristics between cortical (CM), subcortical (SCM), spinal (SM), peripheral (PM) myoclonus, and functional jerks (FJ).Methods: Clinical notes for all patients with myoclonus over an 8-year period (2006-2014) were reviewed retrospectively. We used the conclusion of electrophysiological testing as definite diagnosis of myoclonus or FJ.Results: 85 patients were identified suffering from CM (34%), SCM (11%), SM (6%), PM (2%), and 47% FJ. The clinical diagnosis of myoclonus was confirmed by electrophysiological testing in 74% and its subtype in 78% of cases. CM was characterized by an early age of onset, facial myoclonus, and provocation by action. Differentiating features of FJ were an abrupt onset, preceding contributing events and provocation by a supine position.Conclusion: The majority of clinical myoclonic jerk cases were functional in our heterogeneous tertiary clinic cohort. CM was the main anatomical myoclonic subtype. Clinical diagnosis was accurate in the majority of cases, although electrophysiological testing was important to verify the clinical classification. Significance: In patients with jerky movements a functional diagnosis should be considered. Determination of the myoclonic subtypes is important to initiate tailored treatment. (C) 2016 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.
KW - Myoclonus
KW - Anatomical subtype
KW - Clinical characteristics
KW - Electrophysiological characteristics
KW - Etiological diagnosis
KW - PSYCHOGENIC MOVEMENT-DISORDERS
KW - PROPRIOSPINAL MYOCLONUS
KW - PREVALENCE
KW - TREMOR
U2 - 10.1016/j.clinph.2016.10.093
DO - 10.1016/j.clinph.2016.10.093
M3 - Article
C2 - 27940047
SN - 1388-2457
VL - 128
SP - 253
EP - 259
JO - Clinical Neurophysiology
JF - Clinical Neurophysiology
IS - 1
ER -