Home > Encyclopedia of Neurological Disorders > Myoclonus

Definition

Myoclonus is a brief, rapid, shock-like jerking movement.

Description

Myoclonus can be a symptom of a separate disorder, or can be the only or primary neurological finding, in which case it is termed "essential myoclonus." Myoclonus may occur in epilepsy, or following many different types of brain injury, such as lack of oxygen, stroke, trauma, or poisoning. Myoclonus can occur in one or more limbs, or may be generalized, involving much of the body.

Demographics

Because myoclonus is so often part of another disorder, the prevalence of myoclonus is not known with certainty. One study indicates that the prevalence of all types of myoclonus may be approximately 10 per 100,000 population.

Causes and symptoms

Myoclonus...