Spinal myoclonus
true
SNOMEDCT_US:698836007
2009-09-20T08:53:39Z
Spinal myoclonus is generally due to a tumor, infection, injury, or degenerative process of the spinal cord, and is characterized by involuntary rhythmic muscle contractions, usually at a rate of more than one per second. Myoclonus occurs synchronously in several muscles and can be increased in severity and frequency by fatigue or stress, but is usually unaffected by sensory stimuli. Spinal myoclonus ceases during sleep or anesthesia.
human_phenotype
UMLS:C3697670
HP:0010531
peter
Spinal myoclonus results in myoclonic jerks of the body that may not be modified by sleep or by voluntary action (therefore it may be present awake and asleep and at rest or during movement). Spinal segmental myoclonus is usually symptomatic of an underlying structural spinal lesion such as syringomyelia. It is confined to one or few contiguous myotomes and may occur irregularly or quasirhythmically, with a variable frequency. Propriospinal myoclonus is a form of spinal myoclonus where the axial muscles are recruited extensively along long propriospinal pathways. Typically, there are axial flexion jerks involving the neck, trunk and hips with a frequency of 1-6 Hz. Propriospinal myoclonus typically occurs spontaneously, especially in the recumbent position, or may be provoked by tapping of the abdomen or by eliciting tendon reflexes.
Miscellaneous