Hyperkinetic Movement Disorders

Tremor Rhythmic oscillation of a body part due to intermittent muscle contractions Dystonia Involuntary patterned sustained or repeated muscle contractions often associated with twisting movements and abnormal posture. Athetosis Slow, distal, writhing, involuntary movements with a propensity to affect the arms and hands Chorea Rapid, semipurposeful, graceful, dance-like nonpatterned involuntary movements involving distal or proximal muscle groups Myoclonus Sudden, brief (<100 ms), jerk-like, arrhythmic muscle twitches Tic Brief, repeated, stereotyped muscle contractions that are often suppressible. Can be simple and involve a single muscle group or complex and affect a range of motor activities