Generalized myoclonic seizure Generalised myoclonic seizure UMLS:C0014550 HP:0007294 HP:0007075 Generalized myoclonic seizures Myoclonus seizures UMLS:C4021759 HP:0007202 Myoclonic epilepsy, progressive SNOMEDCT_US:37356005 Generalised myoclonic seizures SNOMEDCT_US:267581004 Generalised epileptic myoclonus UMLS:C0751778 HP:0007284 HP:0002123 SNOMEDCT_US:192992007 Generalized epileptic myoclonus HP:0006902 HP:0006869 A generalized myoclonic seizure is a type of generalized motor seizure characterized by bilateral, sudden, brief (<100 ms) involuntary single or multiple contraction of muscles or muscle groups of variable topography (axial, proximal limb, distal). Myoclonus is less regularly repetitive and less sustained than is clonus. Generalized-onset motor seizure Myoclonic seizure