1 MCQs in Medicine for NEET PG
A 58-year-old man with hypertension and chronic obstructive pulmonary disease presents with palpitations and dyspnea. His ECG shows a regular narrow-complex tachycardia at 150 bpm. The rhythm strip reveals the pattern marked **A** — regular atrial activity at 300 bpm with a characteristic sawtooth appearance in leads II, III, and aVF, and a 2:1 AV block. Which of the following best describes the underlying mechanism of this arrhythmia?
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