A 6-year-old boy with known tetralogy of Fallot (TOF) presents to the emergency department with acute cyanotic spell. Arterial blood gas shows pH 7.28, PaCO₂ 48 mmHg, PaO₂ 35 mmHg, and HCO₃⁻ 22 mEq/L. The child is anxious and tachypneic. Which of the following is the MOST appropriate immediate management?

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