A 54-year-old woman is admitted on day 1 with a Hunt-Hess grade 3 subarachnoid hemorrhage from a ruptured anterior communicating artery aneurysm (coiled immediately). Continuous EEG monitoring is initiated per neurocritical care protocol. On day 7, she develops progressive left hemiparesis and decreased alertness. CT angiography shows severe narrowing of the right MCA and A1 segment. The EEG pattern marked **B** in the diagram—progressive focal delta slowing with a falling alpha-delta ratio over the right frontotemporal region—is observed over 8 hours preceding her clinical deterioration. Which of the following best explains the pathophysiology underlying this EEG finding and the patient's clinical presentation?
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