Nonrhythmic hyperkinetic disorders can be Slow (eg, athetosis) Sustained (eg, dystonias) Rapid (eg, myoclonus, chorea, tics, hemiballismus) Rapid nonrhythmic hyperkinetic disorders may be Suppressible (eg, tics) Nonsuppressible (eg, hemiballismus, chorea, myoclonus) Athetosis and chorea may occur together as choreoathetosis.