A 38-year-old man of Southeast Asian descent presents to the emergency department after a syncopal episode during sleep. His 12-lead ECG is shown. The structure marked **A** in the diagram demonstrates coved-type ST elevation ≥ 2 mm in leads V1–V2 with a descending morphology followed by negative T waves. Which of the following best describes the underlying pathophysiology and immediate management implication of this ECG finding in the context of Brugada syndrome Type 1?