A 55-year-old man remains comatose 48 hours after resuscitated cardiac arrest despite discontinuation of sedation. He has absent motor response to noxious stimulation (M1) and preserved brainstem reflexes. An EEG (marked **B**) shows a widespread, monotonous 8–12 Hz rhythm with anterior predominance that does not attenuate to eye opening or noxious stimulation. Which of the following best describes the prognostic implication of the EEG pattern marked **B**?
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