1 MCQs in Medicine for NEET PG
A 42-year-old woman presents with recurrent palpitations and presyncope triggered by exercise and emotional stress. 12-lead ECG during an episode shows a wide QRS complex with left bundle branch block pattern and inferior axis deviation, with precordial transition at V4. Transthoracic echocardiography is normal. The arrhythmia marked **A** in the diagram is suspected. Which of the following is the MOST distinctive electrophysiologic mechanism underlying this arrhythmia that explains its acute response to intravenous adenosine?
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