A critically ill patient undergoes continuous EEG monitoring. The EEG image shows generalized rhythmic delta activity at approximately 2.5 Hz, without definite evolution, without spike-wave or periodic discharge morphology, and without a time-locked clinical correlate. According to the ACNS Standardized Critical Care EEG Terminology 2021, how should this EEG pattern be classified?

• Electrographic seizure
• Ictal-interictal continuum
• Generalized rhythmic delta activity at 2.5 Hz
• Generalized periodic discharges at 2.5 Hz

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