1 MCQs in Medicine for NEET PG
A 68-year-old man undergoes elective CABG for triple-vessel disease. On postoperative day 1, telemetry shows a regular narrow-complex rhythm at 78 bpm. The ECG demonstrates regular QRS complexes with inverted P waves appearing immediately after each QRS complex in leads II, III, and aVF, with upright P waves in aVR. The patient is hemodynamically stable with normal blood pressure and adequate urine output. The rhythm marked **A** in the diagram is most consistent with which of the following regarding its mechanism and immediate management?
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