A 28-year-old woman with known Wolff-Parkinson-White (WPW) syndrome presents to the emergency department with palpitations, dizziness, and a heart rate of 220 bpm. Her blood pressure is 110/70 mmHg, and she is alert and haemodynamically stable. A 12-lead ECG shows a regular narrow-complex tachycardia with a short PR interval and delta waves during sinus rhythm. What is the most appropriate immediate management?

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