Dystonia is a neurological hyperkinetic movement disorder in which sustained or repetitive muscle contractions result in twisting and repetitive movements or abnormal fixed postures. The movements may resemble a tremor. Dystonia is often intensified or exacerbated by physical activity, and symptoms may progress into adjacent muscles. The disorder may be hereditary or caused by other factors such as birth-related or other physical trauma, infection, poisoning (e.g., lead poisoning) or reaction to pharmaceutical drugs, particularly neuroleptics, or stress. Treatment must be highly customized to the needs of the individual and may include oral medications, chemodenervation botulinum neurotoxin injections, physical therapy, or other supportive therapies, and surgical procedures such as deep brain stimulation. There are multiple types of dystonia, and many diseases and conditions may cause dystonia. Dystonia is classified by: Clinical characteristics such as age of onset, body distribution, nature of the symptoms, and associated features such as additional movement disorders or neurological symptoms, and Cause (which includes changes or damage to the nervous system and inheritance). Physicians use these classifications to guide diagnosis and treatment. Generalized Focal Segmental Psychogenic Acute dystonic reaction Vegetative-vascular For example, dystonia musculorum deformans (Oppenheim, Flatau-Sterling syndrome): Normal birth history and milestones Autosomal dominant Childhood onset Starts in lower limbs and spreads upwards Also known as torsion dystonia or idiopathic torsion dystonia (old terminology "dystonia musculorum deformans"). Focal dystonia These most common dystonias are typically classified as follows: The combination of blepharospasmodic contractions and oromandibular dystonia is called cranial dystonia or Meige's syndrome. Segmental dystonias affect two adjoining parts of the body: Hemidystonia affects an arm and foot on one side of the body. Multifocal dystonia affects many different parts of the body.

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Related concepts (34)
Spasm
A spasm is a sudden involuntary contraction of a muscle, a group of muscles, or a hollow organ such as the bladder. A spasmodic muscle contraction may be caused by many medical conditions, including dystonia. Most commonly, it is a muscle cramp which is accompanied by a sudden burst of pain. A muscle cramp is usually harmless and ceases after a few minutes. It is typically caused by ion imbalance or muscle overload. There are other causes of involuntary muscle contractions, and some of these may cause a health problem.
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Benzatropine (INN), known as benztropine in the United States and Japan, is a medication used to treat movement disorders like parkinsonism and dystonia, as well as extrapyramidal side effects of antipsychotics, including akathisia. It is not useful for tardive dyskinesia. It is taken by mouth or by injection into a vein or muscle. Benefits are seen within two hours and last for up to ten hours. Common side effects include dry mouth, blurry vision, nausea, and constipation.
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