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Myoclonus

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Definition: Involuntary shock-like contractions, irregular in rhythm and amplitude, followed by relaxation, of a muscle or a group of muscles. This condition may be a feature of some CENTRAL NERVOUS SYSTEM DISEASES; (e.g., EPILEPSY, MYOCLONIC). Nocturnal myoclonus is the principal feature of the NOCTURNAL MYOCLONUS SYNDROME. (From Adams et al., Principles of Neurology, 6th ed, pp102-3).  for "myoclonic seizure" consider MYOCLONUS or EPILEPSY, MYOCLONIC or SPASMS, INFANTILE; note other myoclonus terms are also available   
Examples Opsoclonus-Myoclonus Syndrome
Other names Polymyoclonus; Myoclonus, Palatal; Myoclonus, Nocturnal; Myoclonus, Action; Upper Extremity Myoclonus; Sleep Myoclonus; Simplex, Myoclonus; Segmental Myoclonus; Palatal Myoclonus; Oculopalatal Myoclonus; Nocturnal Myoclonus; Myoclonic Jerks; Lower Extremity Myoclonus; Jerks, Myoclonic; Jerking, Myoclonic; Jerk, Myoclonic; Intention Myoclonus; Eyelid Myoclonus; Extremity Myoclonus, Upper; Extremity Myoclonus, Lower
 
SubstanceCAS Registry & nameCategoriesSource
Herrmann syndrome  0   *Cerebellar Ataxia *Deafness *Diabetes Mellitus *Diabetic Neuropathies *Kidney Diseases *Myoclonus.
Feigenbaum Bergeron Richardson syndrome  0   *Arteriosclerosis *Diabetes Mellitus *Epilepsies, Myoclonic *Hearing Loss, Bilateral *Myoclonus *Nephrotic Syndrome *Neurodegenerative Diseases.

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Sources: NLM Medical Subject Headings, NIH UMLS, Drugs@FDA, FDA AERS original data copyright United States Government. No endorsement implied. Last modified 6/6/2012

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