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Discinesia tardia: I. fisiopatologia e tratamento

Tardive diskynesia: pathophysiology and treatment

Resumos

A introdução dos neurolépticos foi importante contribuição para o tratamento das doenças mentais. Contudo sua eficácia foi limitada por efeitos colaterais, entre os quais se encontram movimentos anormais da musculatura orofacial, cujo aparecimento parece estar relacionado à desnervação farmacológica crônica de receptores no estriado, com o conseqüente desenvolvimento de hipersensibilidade por desnervação. É feita revisão desta e de outras teorias fisiopatológicas, além do tratamento, que deve basear-se na retirada dos neurolépticos, sempre que possível. São apresentadas várias drogas com ação nos sistemas dopaminérgico, colinérgico e GABA-érgico que podem ser úteis no tratamento.


The major breakthrough in the treatment of mental diseases was the introduction of neuroleptics in the early 50's. Soon after this an increasing number of patients under the use of these drugs presented involuntary abnormal orofacial movements which have been considered directly dependent on the drug action. The term "tardive diskynesia" (TD) was coined for these movements. Many theories have been put forward to explain the pathophysiology of TD. The most proeminent theory concerns with the possibility of denervation hypersensitivity occurring in striatal post-synaptic dopamine neurons. The authors review the most important theories and offer a new possibility based on the assumption that the post-synaptic dopamine receptors under chronic neuroleptic action develop a shift in its affinity towards the direction of agonist action. This means that the post-synaptic receptor increase its affinity, and possibly its number, to agonist drugs and dopamine. The paper includes a review of the main drugs used in this condiction, attempting to explain the specific sites where they act, either in the dopaminergic, cholinergic or GABA-ergic systems.


Discinesia tardia: I. fisiopatologia e tratamento

Tardive diskynesia: pathophysiology and treatment

Luiz Augusto F. AndradeI; Paulo Henrique F. BertolucciII; João Santos PereiraII

IProfessor Adjunto e Doutor em Neurologia. Setor de Investigações em Moléstias Extrapiramidais da Disciplina de Neurologia do Departamento de Neurologia e Neurocirurgia da Escola Paulista de Medicina

IIPós-graduando em Neurologia. Setor de Investigações em Moléstias Extrapiramidais da Disciplina de Neurologia do Departamento de Neurologia e Neurocirurgia da Escola Paulista de Medicina

RESUMO

A introdução dos neurolépticos foi importante contribuição para o tratamento das doenças mentais. Contudo sua eficácia foi limitada por efeitos colaterais, entre os quais se encontram movimentos anormais da musculatura orofacial, cujo aparecimento parece estar relacionado à desnervação farmacológica crônica de receptores no estriado, com o conseqüente desenvolvimento de hipersensibilidade por desnervação. É feita revisão desta e de outras teorias fisiopatológicas, além do tratamento, que deve basear-se na retirada dos neurolépticos, sempre que possível. São apresentadas várias drogas com ação nos sistemas dopaminérgico, colinérgico e GABA-érgico que podem ser úteis no tratamento.

SUMMARY

The major breakthrough in the treatment of mental diseases was the introduction of neuroleptics in the early 50's. Soon after this an increasing number of patients under the use of these drugs presented involuntary abnormal orofacial movements which have been considered directly dependent on the drug action. The term "tardive diskynesia" (TD) was coined for these movements. Many theories have been put forward to explain the pathophysiology of TD. The most proeminent theory concerns with the possibility of denervation hypersensitivity occurring in striatal post-synaptic dopamine neurons. The authors review the most important theories and offer a new possibility based on the assumption that the post-synaptic dopamine receptors under chronic neuroleptic action develop a shift in its affinity towards the direction of agonist action. This means that the post-synaptic receptor increase its affinity, and possibly its number, to agonist drugs and dopamine. The paper includes a review of the main drugs used in this condiction, attempting to explain the specific sites where they act, either in the dopaminergic, cholinergic or GABA-ergic systems.

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Full text available only in PDF format.

Trabalho realizado no Setor de Investigações em Moléstias Extrapiramidais da Disciplina de Neurologia do Departamento de Neurologia e Neurocirurgia da Escola Paulista de Medicina.

Disciplina de Neurologia, Departamento de Neurologia e Neurocirurgia, Escola Paulista de Medicina - Rua Botucatu, 740 - 04023, São Paulo, SP - Brasil.

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Datas de Publicação

  • Publicação nesta coleção
    13 Ago 2012
  • Data do Fascículo
    Dez 1984
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