Abnormal involuntary movements (AIMs) are also known as ‘dyskinesias’. There are several varieties of dyskinesia which have different clinical appearances, underlying causes and treatments. Tremor, chorea, dystonia and myoclonus are examples of types of dyskinesia which have different mechanisms and modalities of treatment.
Tics and stereotypies may also be considered to be related but some experts call these ‘unvoluntary’ because there is an element of voluntary control.
Cerebrovascular diseases are a common cause of secondary movement disorders. Post-stroke movement disorders include Parkinsonism and a wide range of hyperkinetic movement disorders, including chorea, ballism, athetosis, dystonia, tremor, myoclonus, stereotypies and akathisia.