1 MCQs in Medicine for NEET PG
A 72-year-old man with severe COPD presents to the ICU with acute exacerbation, hypoxia (SpO2 88%), and hypercapnia (pCO2 58 mmHg). Bedside ECG shows an irregularly irregular narrow-complex tachycardia at 130 bpm with at least three distinct P-wave morphologies visible in lead II and varying PR intervals, with a clear isoelectric baseline between P waves. The rhythm shown is marked as **A** in the diagram. Which of the following is the MOST appropriate initial management step for this arrhythmia?
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