Understanding dystonia: diagnostic issues and how to overcome them / Compreendendo a distonia: questões diagnósticas e como superá-las

ABSTRACT The diagnosis and treatment of dystonia are challenging. This is likely due to gaps in the complete understanding of its pathophysiology, lack of animal models for translational studies, absence of a consistent pathological substrate and highly variable phenotypes and genotypes. The aim of this review article is to provide an overview of the clinical, neurophysiological and genetic features of dystonia that can help in the identification of this movement disorder, as well as in the differential diagnosis of the main forms of genetic dystonia. The variation of penetrance, age of onset, and topographic distribution of the disease in carriers of the same genetic mutation indicates that other factors – either genetic or environmental – might be involved in the development of symptoms. The growing knowledge of cell dysfunction in mutants may give insights into more effective therapeutic targets.

RESUMO O diagnóstico e o tratamento da distonia podem ser desafiadores. Isso se dá provavelmente a pouca compreensão da fisiopatologia, a falta de modelos animais para estudos translacionais, ausência de um substrato patológico consistente e genótipo e fenótipo altamente variáveis. O objetivo deste artigo de revisão é fornecer uma visão geral dos aspectos clínicos, neurofisiológicos e genéticos de distonia que podem ajudar na identificação deste distúrbio do movimento, bem como no diagnóstico diferencial das principais formas de distonia hereditária. Há uma ênfase particular na nova definição e classificação da Internacional das Distonias, bem como as recentes descobertas dos mecanismos moleculares subjacentes em algumas formas de distonia primária. A variação de penetrância, idade de início, e distribuição topográfica da doença em portadores da mesma mutação genética indica que outros fatores - genéticos ou ambientais podem estar envolvidos no desenvolvimento dos sintomas. O conhecimento crescente sobre a disfunção celular em mutantes pode gerar insights sobre alvos terapêuticos mais eficazes.

Reconhecimento automático de Distonia Laríngea com base na sustentação do Pitch / Automatic Laryngeal Dystonia recognition based on Pitch sustainment / Reconocimiento automático de distonía laríngea basado en el apoyo de la Pitch

Objetivos: Desenvolver uma ferramenta automatizada para reconhecimento dos segmentos sem presença de voz durante a fonação do paciente com base na sustentação do Pitch. Método: Os procedimentos para construção e verificação da técnica são a aquisição da voz, janelamento, aplicação da Transformada Discreta de Fourier, detecção do Pitch e a verificação do Pitch. Resultados: Com a análise das 101 vozes, a ferramenta diagnosticou 56 vozes com Distonia Laríngea e 45 como saudáveis. Já o especialista diagnosticou 53 vozes com Distonia Laríngea e 48 como vozes saudáveis. Conclusão: Os resultados demonstraram que o diagnóstico realizado pela ferramenta e pelo especialista são equivalentes e, portanto, a proposta de utilizar a sustentação do Pitch como métrica para reconhecimento da patologia mostrou-se eficiente...

Objectives: Develop an automated tool for recognition of segments without the presence of voice during phonation of the patient based on Pitch sustainment. Method: The procedures for construction and verification of the technique are the acquisition of voice, windowing, application of Discrete Fourier Transform, the Pitch detection and verification of Pitch. Results: With the analysis of 101 voices, the tool diagnosed 56 voices with laryngeal dystonia and 45 as healthy. Already the specialist diagnosed 53 voices with laryngeal dystonia and 48 voices as healthy. Conclusion: The results showed that the diagnosis made by the tool and specialist is equivalent and therefore the proposed use of the Pitch sustainment as a measure for the recognition of the pathology was effective...

Objetivos: Desarrollar una herramienta automatizada para el reconocimiento de segmentos sin la presencia de la voz durante la fonación basado en el apoyo de la Pitch. Método: Los procedimientos para la construcción y la verificación de la técnica son la adquisición de la voz, de ventanas, la aplicación de la Transformada Discreta de Fourier, la detección de tono y la verificación de Pitch. Resultados: Con el análisis de 101 voces, la herramienta ha diagnosticado 56 voces con distonía laríngea y 45 lo más saludable. Ya el especialista diagnostica 53 voces con distonía laríngea y 48 voces tan saludables. Conclusión: Los resultados mostraron que el diagnóstico realizado por la herramienta y por el especialista son equivalentes y por lo tanto el uso propuesto de la Pitch apoyo como una métrica para el reconocimiento de la patología fue eficiente...

Cervical dystonia: about familial and sporadic cases in 88 patients / Distonia cervical: consideracoes sobre casos esporadicos e familiares em 88 pacientes

Cervical dystonia (CD) affects the musculature of the neck in a focal way or associated to other parts of the body. The aim of this study was to identify clinical differences between patients with dystonia patients without family history and with family history (sporadic). Eighty-eight patients with CD were recruited in a Movement Disorders Clinic between June of 2008 and June of 2009. Only patients with no etiological diagnosis were accepted for analysis. The age of onset of symptoms was later in patients with focal and segmental dystonia than in patients with generalized dystonia (p<0.001). The severity of symptoms was higher in patients with sporadic dystonia than in familial patients (p<0.01). Generalized cases were more severe in patients with a family history (p<0.01). Sporadic patients had higher levels of pain than familial cases (p<0.05). We expect soon to present the results of genetic analyzes of these patients.

A distonia cervical (CD) afeta a musculatura do pescoço de modo focal ou em combinação com outras partes do corpo. O objetivo deste estudo foi identificar diferenças clínicas entre pacientes com distonia com história familiar e pacientes sem história familiar (esporádicos). Foram selecionados 88 pacientes com DC no Setor de Distúrbios do Movimento entre julho de 2008 e junho de 2009. Somente os pacientes sem diagnóstico etiológico foram admitidos para análise. A idade de início dos sintomas foi mais tardia em pacientes com distonia focal e segmentar do que em pacientes com distonia generalizada (p<0,001). A gravidade dos sintomas foi maior em pacientes com distonia focal esporádicos do que naqueles com história familiar (p<0,01). Os casos generalizados foram mais graves nos pacientes com história familiar (p<0,01). Pacientes esporádicos tiveram níveis maiores de dor em relação aos casos familiares (p<0,05). Esperamos apresentar em breve resultados de análises genéticas desses pacientes.

Paroxysmal dystonia and neuromyelitis optica / Distonia paroxística e neuromielite óptica

Paroxysmal dyskinesias (PD) are thought to be rare movement disorders. The overwhelming majority of reported cases are primary. Secondary PD has seen reported to occur in some conditions, mainly in multiple sclerosis and head trauma. The anatomic origin of the lesion is also rarely seen at the spinal cord. Our objective was to describe four patients with paroxysmal dystonia secondary to spinal lesions during the recovering phase of a neuromyelitis optica (NMO) bout. In the reviewed literature, we do not find any report of PD related to NMO.

Discinesias paroxísticas (DP) são distúrbios do movimento raros. A maioria dos casos relatados é de origem primária. DP secundárias têm sido relatadas em algumas condições, principalmente na esclerose múltipla e no trauma craniano. A origem anatômica da lesão também é raramente observada na medula. O objetivo deste trabalho foi descrever quatro pacientes com distonia paroxística secundária a lesões medulares, ocorrida durante a fase de recuperação do surto de neuromielite óptica (NMO). Na literatura consultada, não encontramos qualquer relato de DP secundárias à NMO.

Comparison of clinical characteristics of patients with adductor laryngeal dystonia in the focal and segmental types / Comparação entre características clínicas de pacientes com distonia laríngea de adução nas formas focal e segmentar

Dystonia is a central motor processing neurological disorder characterized by abnormal, often action-induced, involuntary movements or uncontrolled spasms. AIM: To compare patients with the diagnoses of focal and segmental adductor laryngeal dystonia at the Neurolarynx Outpatient Clinic of the Federal University of São Paulo. MATERIALS AND METHODS: A clinical retrospective study of data collected from patient registries from 2003 to 2009. RESULTS: Of 34 patients, 25 presented focal dystonia and 9 presented segmental dystonia. There were 30 females (88. 2 percent) and 4 males (11. 8 percent). A relation with a traumatic event was reported in 11 cases (32. 4 percent). Vocal tremor was observed in 21 patients (61. 8 percent). The mean age at onset, the age at diagnosis, and time between the onset and the diagnosis were respectively 55, 61. 3 and 6. 3 years. There was no statistical difference between patients with focal laryngeal adductor dystonia and segmental dystonia in the study data. CONCLUSIONS: There were no statistical differences among patients with focal adductor laryngeal dystonia and segmental dystonia relating to age of onset, age of diagnosis, gender, time between onset and diagnosis, presence of associated tremor, and relation to trauma.

A distonia é um transtorno neurológico do processamento motor central caracterizado por movimentos involuntários ou espasmos incontroláveis, induzidos por atividade. OBJETIVO: Comparar pacientes com o diagnóstico de distonia laríngea nas formas focal e distonia segmentar do Ambulatório de Neurolaringe. MATERIAL E MÉTODO: Estudo clínico retrospectivo a partir de levantamento dos prontuários entre 2003 e 2009. RESULTADOS: Dos 34 pacientes, 25 apresentaram distonia focal e 9 apresentaram distonia segmentar. Do total da amostra, 30 (88,2 por cento) eram do sexo feminino e 4 (11,8 por cento) do sexo masculino. A relação com situação traumática estava presente em 11 (32,4 por cento). O tremor associado esteve presente em 21 pacientes (61,8 por cento). A média da idade do início das queixas, idade do diagnóstico e do tempo de queixa até o diagnóstico da amostra foi respectivamente de 55 anos, 61,3 anos e 6,3 anos. Não houve diferença estatisticamente significativa entre pacientes com distonia laríngea focal e distonia laríngea nos dados pesquisados. CONCLUSÃO: Não houve diferenças entre pacientes com distonia laríngea focal e distonia laríngea segmentar quanto à idade de início, idade do diagnóstico, gênero, tempo de duração dos sintomas até o diagnóstico, presença de tremor associado e relação com situação traumática.

Recurrent opisthotonus in catatonia: An atypical presentation.

Opisthotonus is known to occur in tetanus, rabies, cerebral malaria, neurosyphilis, acute cerebral injury and other medical conditions. Opisthotonus, so far, has not been reported in any major psychiatric disorder. Authors report a case of recurrent opisthotonus presenting concurrently with other catatonic signs which showed dramatic response to combination of lorazepam and electroconvulsive therapy (ECT). Clinicians should consider the possibility of catatonia in the differential diagnosis of opisthotonus since catatonia can be treated easily with benzodiazepines and ECT.

Clinical characteristics of paroxysmal kinesigenic choreoathetosis: diagnosis, treatment and prognosis / 华中科技大学学报（医学）（英德文版）

The clinical characters, diagnosis and differential diagnosis of paroxysmal kinesigenic choreoathetosis (PKC), and efficacy of the anti-epileptic drugs (AEDs) were investigated. Thirty-one patients with PKC were collected, and the clinical characters and change of EEG were analyzed. The average age of the first attack was 16.8 years old and the pinnacle was 10 to 20 years old. There were definite causes for every attack and the sudden movement was the most common one (92%). Time for the whole attack was always less than 1 min. The attack presented with muscle tension disturbance (83.9%), movement like dancing (16.1%), abnormal movement of mouth and face and other symptoms (16.2%). The attack tended to be very frequent and 71% patients were beyond once per day. The EEG examination and image scan of primary PKC were normal in most patients. Low dosage of AEDs could control the attack of 50%-77.3% patients. It was concluded that PKC was a common disease of movement disorder. The therapy by AEDs was very effective. PKC should be differentiated from epilepsy and the relationship between PKC and epilepsy needs further research.

Non-choreic movement disorders as initial manifestations of Huntington's disease

We describe seven patients with genetically confirmed Huntington's disease (HD) who had non-choreic movement disorders as presenting symptoms or signs. Patients with movement disorders other than chorea in the early stages tended to have larger CAG trinucleotide repeat expansion in comparison with more "typical" HD patients.

Nós descrevemos sete pacientes com doença de Huntington, geneticamente confirmada, cuja apresentação motora inicial foi diferente de coréia. Pacientes com manifestação motora inicial diferente de coréia apresentaram maior número de expansões repetidas de CAG trinucleotídeo quando comparados com aqueles com sintomatologia motora "típica".

Distonia laríngea: relato de caso e tratamento com toxina botulínica / Laryngeal dystonia: case report and treatment with botulinum toxin

Distonia laríngea, ou disfonia espasmódica, é caracterizada por contrações involuntárias e inapropriadas da musculatura responsável pela fonação, sendo a do tipo adutora a mais comum. Caracteriza-se por quebras fonatórias, sendo seu diagnóstico confirmado por videolaringoestroboscopia. O tratamento de escolha é feito com a aplicação direta de toxina botulínica nos músculos responsáveis pelo movimento incoordenado. O objetivo desse trabalho é relatar o caso de uma paciente com diagnóstico de distonia laríngea do tipo adutora, tratada com toxina botulínica e discutir as vantagens e observações descritas na literatura a respeito desse tratamento.

Laryngeal dystonia or spasmodic dysphonia is characterized by involuntary and innapropiate spasms of vocal muscles, having the adductor type as the most common one. It is chacterized by strain-strangled voice with pitch breaks. Diagnosis is made by means of videolaryngostroboscopic exam. The treatment of choice is done with botulinum toxin directly injected in the muscles responsible for the mismatched movement. The aim of this study is to report on an adductor- type dysphonia patient and to discuss the advantages and observations about this treatment reported in the literature.

Paroxysmal kinesigenic dyskinesia.

Paroxysmal kinesigenic dyskinesia (PKD) is a rare disorder characterised by brief and frequent attacks of abnormal involuntary movements induced by sudden movement. This disorder has not been reported previously in Sri Lanka. We studied six patients with respect to clinical presentation, aetiology, family history and response to treatment, and describe the Sri Lankan patterns of this illness. All the patients were males and the age at onset was from 11 to 22 years. The involuntary movements in all were dystonic and affected one or both sides, involving the face in the majority. All had difficulty in speaking during the attacks. One patient had an occasional attack during exercise. In all, the illness was sporadic, none had a family history of a similar illness and in none was it due to a secondary cause. The attacks usually lasted 10-60 seconds, and occurred up to 20 times a day. All patients responded well to anticonvulsants. PKD in Sri Lanka has a pattern similar to that described worldwide.

Distonías ocupacionales / Occupational dystonias

La distonía se define como una co-contracción de músculos agonistas y antagonistas sostenida que puede causar torsión, movimientos involuntarios o posturas anormales. Las distonías ocupacionales corresponden a un grupo especial de patología secundaria a un esfuerzo repetitivo relacionado con la actividad profesional que realiza el afectado, como en guitarristas, violinistas y trompetistas. En su fisiopatología se describen alteraciones a nivel del sistema nervioso periférico y central. Estudios en monos han demostrado que los movimientos repetitivos mediante una estimulación sensitiva pueden producir anomalías centrales en la corteza somatosensorial con un crecimiento de los campos receptivos estimulados y deformación de las separaciones entre dichos campos. La reeducación sensorial con el uso de una férula y esquemas de ejercicio aparece como una alternativa terapéutica. Se revisa la evidencia acumulada que apoya la hipótesis de que las distonías ocupacionales producidas por una estimulación repetitiva presentan alteraciones a nivel sensitivo cortical con compromiso del rendimiento motor que se benefician con terapia de reeducación sensorial.

Distonia segmentar como manifestaçäo de angioma cavernoso: relato de caso / Segmental dystonia as manifestation of cavernous angioma: case report

A distonia é uma síndrome neurológica cuja etiologia costuma não ser bem definida. Relatamos caso de uma paciente que apresentou aos 16 anos de idade dificuldade para tocar piano, havendo um comprometimento progressivo da mão, antebraço e braço esquerdo que posteriormente evoluiu com crises de "ausência" e cefaléia. Realizou exames de imagem que evidenciaram angioma cavernoso na região temporal profunda direita (ínsula). É rara a associação entre essas duas enfermidades, não havendo na literatura relato de distonia segmentar associada a crises de pseudoausência e cefaléia com características migranosas secundária ao angioma cavernoso. Vinte e cinco por cento das distonias são secundárias, o que nos faz sugerir uma investigação mínima em neuroimagem.

A spectrum of dystonias-clinical features and update on management.

Dystonia is an interesting disorder characterized by involuntary movement of the body part or parts leading to abnormal deformed postures. The usual signs and symptoms are local pain, spasm and abnormal movements. Sensory trick is an important clinical phenomenon and is characteristic of dystonia. It is usually separated from other movement disorders such as chorea, athetosis, tics and myoclonus clinically. Various non-dystonic conditions simulate dystonia and need to be separated in view of different line of management. Improved understanding in molecular biology has helped in understanding of the disease. Confusing neuropathology and neurochemistry have deterred the finding of an effective drug, however empirical use of few drugs have improved the gloomy situation. Few conditions such as dopa-responsive dystonia have definite treatment. Recently use of botulinum toxin has provided beneficial response in hyper muscular contraction states such as dystonia and spasticity, Surgery and other non-medical therapies are effective in few situations.