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Cerebral Hyperperfusion and Delayed Coma Recovery after Subdural Hematoma Evacuation.
Journal of Stroke and Cerebrovascular Diseases : the Official Journal of National Stroke Association 2021 October 17
Acute subdural hematoma is a devastating neurological injury with significant morbidity and mortality. In patients with large subdural hematoma resulting in compression of the underlying brain and lateral brain shift, severe neurological deficits and coma can occur. Emergent neurosurgical decompression is a life-saving intervention which improves mortality and neurological function. Persistent coma despite subdural hematoma evacuation is often the result of persistent midline shift, cerebral infarctions related to initial elevated intracranial pressure and herniation, nonconvulsive seizures, and other metabolic and infectious causes; however, a subset of patients remains comatose without a discernable etiology. In this report, we describe an elderly patient who remained comatose without a known cause for several weeks after subdural hematoma evacuation and was found to have delayed cerebral hyperperfusion on brain imaging. After several days, there was marked recovery of consciousness which occurred in a timeframe that matched improvement in brain imaging findings. Cerebral hyperperfusion following subdural hematoma evacuation requires further investigation, and should be considered as a cause of persistent but potentially recoverable coma.
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