dyskenesia

Paroxysmal dyskinesias are rare movement disorders. The onset of paroxysmal dyskinesias in childhood are typically idiopathic (sporadic or familial), whereas those in adulthood are usually secondary to an identifiable cause. Paroxysmal dyskinesias are classified according to precipitating factors, and these include paroxysmal kinesigenic dyskinesia, paroxysmal nonkinesigenic dyskinesia, paroxysmal exertion-induced dyskinesia, and paroxysmal hypnogenic dyskinesia. The pathophysiology remains unknown; however, there is increasing evidence that channelopathies may play a role, which explains the response to anticonvulsant medications in certain kindreds...

Treatment of psychotic symptoms with traditional neuroleptics has been complicated by acute extrapyramidal syndromes (EPS) and late occurring tardive dyskinesia. These widely prevalent disorders have both motor and mental components which impose additional impairments on patients who are already substantially limited by their psychoses. Research activities with new drugs involve multiple neurotransmitters and different receptor subtypes. These new approaches have produced an increasingly desirable group of antipsychotic agents with a low EPS profile...

While dyskinetic movements have been reported in primates with unilateral excitotoxic lesions following stimulation by dopaminergic agonists, the presence and intensity of the dyskinetic syndromes have varied extensively with size and location of lesion. With the intent of producing a more reliable behavioral model of Huntington disease, anatomically-defined lesions of limited size were produced by magnetic resonance imaging-guided stereotaxic injection of quinolinic acid in specific regions within the caudate and putamen of rhesus monkeys...

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No abstract text is available yet for this article.