Movement disorders emergencies Part 2: hyperkinetic disorders.

Although movement disorders do not usually present as neurologic emergencies, there are times when the abrupt onset of an unusual movement abnormality results in emergency department or intensive care unit consultations. Part 1 of this review discussed hypokinetic movement disorders emergencies. Part 2 provides a diagnostic approach to the recognition and treatment of hyperkinetic movement disorders emergencies by identifying phenomenology and reviewing common etiologies.