What is the role of EMG in the diagnosis of giant cell arteritis (GCA) (temporal arteritis)?

Updated: Sep 03, 2020
  • Author: Mythili Seetharaman, MD; Chief Editor: Herbert S Diamond, MD  more...
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Electromyography (EMG) is rarely needed in patients with a clinical presentation of giant cell arteritis. Elderly patients frequently have mildly abnormal nerve conduction studies and EMG findings that suggest a mild peripheral neuropathy, regardless of whether they have GCA. The relationship of such neuropathies to the systemic inflammatory state in some patients is uncertain. In other patients, antecedent ischemic mononeuropathies may occur and eventually resemble a "diffuse," severe, peripheral neuropathy.

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