Adult-onset dystonia-parkinsonism

Adult-onset dystonia-parkinsonism (Orphanet code 199351) is a rare neurological disorder characterized by the combined presence of dystonia and parkinsonian features that manifest in adulthood. Dystonia refers to sustained or intermittent involuntary muscle contractions causing abnormal, often repetitive movements and postures, while parkinsonism encompasses symptoms such as bradykinesia (slowness of movement), rigidity, resting tremor, and postural instability. The condition primarily affects the central nervous system, particularly the basal ganglia circuits that control voluntary movement. Patients typically present in adulthood with progressive motor difficulties. Dystonia may affect the limbs, trunk, neck (cervical dystonia), or face, and parkinsonian features may develop concurrently or sequentially. The combination of these two movement disorder phenotypes can significantly impair daily functioning, mobility, and quality of life. The clinical presentation can vary considerably between individuals, and the condition may overlap with or be difficult to distinguish from other forms of dystonia-parkinsonism syndromes that have specific genetic etiologies. Treatment is primarily symptomatic and supportive. Levodopa therapy may be trialed, though the response can be variable and is often less robust than in idiopathic Parkinson's disease. Other medications used include anticholinergics, dopamine agonists, and muscle relaxants. Botulinum toxin injections may be helpful for focal dystonia. Deep brain stimulation (DBS) has been considered in refractory cases. Physical therapy, occupational therapy, and speech therapy play important roles in maintaining function and managing disability. There is currently no curative treatment available.

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