Generalized myoclonic seizures true UMLS:C0014550 HP:0007294 HP:0007075 Myoclonus seizures UMLS:C4021759 HP:0007202 MSH:D020191 Myoclonic epilepsy, progressive SNOMEDCT_US:37356005 Generalised myoclonic seizures SNOMEDCT_US:267581004 Myoclonic seizures A myoclonic seizure is a single or series of jerks (brief muscle contractions). Each jerk is typically milliseconds in duration. Myoclonic status epilepticus is characterized by ongoing (> 30 minutes) irregular jerking, often with partially retained awareness. These two features distinguish a myoclonic status epilepticus from a generalized clonic seizure, where consciousness is lost and the jerking is sustained and rhythmic. UMLS:C0751778 human_phenotype HP:0007284 Seizures with sudden, brief (< 100 msec) involuntary single or multiple contraction(s) of muscles(s) or muscle groups of variable topography (axial, proximal limb, distal). HP:0002123 MSH:D004831 SNOMEDCT_US:192992007 HP:0006902 HP:0006869 generalized motor onset seizure