A 5-year-old previously healthy boy is brought to the pediatric neurology clinic with progressive loss of language comprehension over 2 months. His parents report he no longer understands spoken instructions, though hearing assessment is normal. He has become hyperactive and inattentive. Occasional focal seizures have been noted. EEG shows the pattern marked **B** in the diagram—continuous spike-and-wave discharges during sleep with a spike-wave index of 88% during NREM sleep, with bilateral temporal predominance. Which of the following is the MOST appropriate first-line management for this EEG abnormality?
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