Atrial fibrillation Quiz: Ace Your Exams

Get ready to dominate your medical and nursing exams by using our dynamic quizzes to elevate your knowledge and increase your confidence. Whether you're gearing up for the USMLE®, COMLEX®, or your next in-class assessment, Osmosis quizzes tackle key topics in pathology, diagnostics, and treatment approaches. By honing in on clinical readiness and decision-making, we make sure the knowledge you gain empowers you both in the classroom and in real-world practice. Jump in and supercharge your exam prep!

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A 26-year-old female presents to the emergency department for evaluation of sudden onset palpitations. She is otherwise healthy and does not take any medications. The patient has had similar episodes in the past, and they self-resolved without treatment. However, the symptoms today have persisted for longer than usual. Temperature is 37.0°C (98.6°F), pulse is 172/min, respirations are 21/min, and blood pressure is 110/71 mmHg. Initial electrocardiogram is demonstrated below:  

  
Image reproduced from Wikimedia Commons  

Which of the following features of this patient's electrocardiogram can be used to localize the anatomic origin of this arrhythmia?  

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