A 68-year-old man with hypertension and diabetes presents to the emergency department with palpitations and dyspnea for 3 hours. His vital signs show HR 145 bpm, BP 138/88 mmHg, RR 22/min. The 12-lead ECG shows the rhythm marked **A** in the diagram — characterized by an irregularly irregular ventricular response with absent distinct P waves and a baseline showing fine undulations. His resting ventricular rate is 145 bpm. Which of the following best describes the pathophysiological mechanism underlying the irregular ventricular response in this rhythm?
A 68-year-old man with hypertension, type 2 diabetes, and a remote stroke 4 years ago presents with palpitations and lightheadedness for 12 hours. On examination, his heart rate is irregularly irregular at 142 bpm, BP 132/84 mmHg, and SpO2 96% on room air. He is alert and hemodynamically stable. ECG shows the pattern marked **A** in the diagram — absent P waves, irregularly irregular R-R intervals, and fibrillatory waves at the baseline. What is the most appropriate IMMEDIATE pharmacologic management for rate control in this hemodynamically stable patient?
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