1 MCQs in Medicine for NEET PG
A 68-year-old man with hypertension, type 2 diabetes, and prior mitral valve repair presents with 3 days of palpitations and dyspnea. On examination, he is hemodynamically stable with HR 150/min (regular) and BP 128/76 mmHg. A 12-lead ECG shows a narrow-complex regular tachycardia. The structure marked **A** in the diagram—the characteristic sawtooth pattern of continuous, undulating negative flutter waves in the inferior leads (II, III, aVF)—is pathognomonic for which arrhythmia mechanism?
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