What causes EEG triphasic waves?

Updated: Sep 24, 2018
  • Author: Kalyani Korabathina, MD; Chief Editor: Tarakad S Ramachandran, MBBS, MBA, MPH, FAAN, FACP, FAHA, FRCP, FRCPC, FRS, LRCP, MRCP, MRCS  more...
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The 3 most common causes of TWE are hepatic encephalopathy [4] , renal failure, and anoxic injury. Other causes of TWs include the following:

  • Hepatic coma/failure

  • Metabolic abnormalities such as hypernatremia, hyponatremia, hypercalcemia, and hypoglycemia

  • Thyroid disease -Hyperthyroidism or hypothyroidism

  • Structural lesions to the brainstem or thalamus such as ischemic stroke and neoplasm

  • Postictal state

  • Serotonin syndrome

  • Cerebral abscess

  • Metrizamide poisoning

  • Naproxen overdose

  • Lithium toxicity

  • Levo-dopamine toxicity

  • Antibiotics such as cefepime

  • Head trauma

  • Cerebral lipidoses

  • Subdural hematoma

  • Carcinomatous meningitis

  • Tumors

  • Maple syrup urine disease

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