1 MCQs in Medicine for NEET PG
A 68-year-old man with hypertension and diabetes presents to the emergency department with palpitations and dyspnea. His ECG shows the pattern marked **A** — irregularly irregular R-R intervals with a ventricular rate of 125 bpm. The absence of organized P waves is noted. Which of the following BEST explains the pathophysiological basis for the finding marked **A** in this patient?
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