Abstract
Localized polymorphic delta wave activity appears ipsilaterally in patients with intracerebral hematoma without a shift of midline structures, regardless of the location of hematoma. Appearance of delta wave slowing after thalamic bleeding is quite variable, however, and may produce localized slowing or unilateral diffuse polymorphic delta wave activity. Unilateral diffuse polymorphic delta wave activity is seen in patients with larger hematomas of 30 mL or more, which cause a shift of the midline structures. The shift of midline structures, including the hypothalamus and surrounding structures, is thought to be one of the main factors responsible for the production of unilateral responsible for the production of unilateral diffuse polymorphic delta wave slowing.
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