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Definitions of Dystonia

  1. A persistent attitude or posture due to the co- contraction of agonists and antagonist muscles in one region of the body. It most often affects the large axial muscles of the trunk and limb girdles. Conditions which feature persistent or recurrent episodes of dystonia as a primary manifestation of disease are referred to as DYSTONIC DISORDERS. ( Adams et al., Principles of Neurology, 6th ed, p77)
  2. A state of abnormal ( either hypo- or hyper-) tonicity in any of the tissues.
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