USMLE Step 2 CK Practice Questions - USMLE Step 2 Clinical Knowledge Exam

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A 45-year-old man is brought to the emergency department with palpitations and lightheadedness. His pulse is irregularly irregular at 140 bpm. ECG shows no P waves and irregularly irregular QRS complexes. His blood pressure is 110/70 mmHg. Which of the following is the most appropriate initial management?

Immediate electrical cardioversion Intravenous beta-blocker for rate control Intravenous heparin followed by warfarin Amiodarone for rhythm control

Correct Answer:

Intravenous beta-blocker for rate control

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