A 58-year-old man with known cirrhosis presents with altered mental status and confusion. His EEG shows the pattern marked **A** in the diagram — generalized, bilaterally symmetric waves with a characteristic three-phase morphology (initial small negative deflection, large positive deflection, final negative deflection), occurring at 1.5–2.5 Hz with frontal predominance and anterior-to-posterior lag. Serum ammonia is elevated at 120 µmol/L. Which of the following is the most appropriate NEXT STEP in management?
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