Hyperkinetic Movement Disorders

The hyperkinetic movement disorders include heterogeneous diseases and syndromes, all characterized by one or a variety of excessive, involuntary movements. The hyperkinetic movement disorders are heterogeneous in clinical presentation, but a rational and practical approach to diagnosis exists based on new genetic correlations and targeted laboratory investigations. Treatments informed by a still-developing picture of motor pathophysiology offer significant benefit for these disorders. This chapter discusses choreiform disorders, including patterns in choreiform diagnosis; tremor disorders; paroxysmal disorders, including tics and myoclonus; dystonias, including monogenic primary dystonias; and pathophysiology and treatment in the hyperkinetic movement disorders. Figures include clinical photos, computed tomography scans, and an algorithm representing cortical-subcortical circuitry. Tables delineate definitions, distinguishing clinical features, medications, genetics, protein products, and treatments associated with various disorders. This chapter contains 6 figures, 12 tables, 145 references, and 5 Board-styled MCQs.