1 MCQs in Medicine for NEET PG
A 68-year-old male with severe COPD presents to the emergency department with acute dyspnea and palpitations. His ECG shows an irregular tachycardia with a ventricular rate of 115 bpm. The rhythm strip reveals the pattern marked **B** in the diagram — multiple distinct P-wave morphologies with an isoelectric baseline between P waves and varying P-P, PR, and R-R intervals. Serum potassium is 3.2 mEq/L and magnesium is 1.6 mg/dL. Which of the following is the most appropriate INITIAL management step for this arrhythmia?
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