A 2-week-old infant born to an Indian mother presents with severe cyanosis (SpO₂ 65%), poor feeding, and a single loud S2. Chest X-ray shows an 'egg-on-string' appearance with decreased pulmonary vascular markings. Echocardiography confirms complete transposition of the great arteries (TGA) with an intact ventricular septum. What is the most appropriate immediate next step in management?

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