Supraventricular arrhythmias 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 32-year-old male presents to the emergency department with palpitations. The patient was in the park jogging when he suddenly felt lightheaded, dizzy, and noted a pounding sensation in his chest. The symptoms resolved prior to arrival, and he now feels back to his baseline. Medical history is otherwise noncontributory, and he does not consume alcohol, tobacco, or illicit substances. Temperature is 37.0°C (98.6°F), pulse is 88/min, respirations are 14/min, and blood pressure is 124/72 mmHg. The electrocardiogram from triage is demonstrated below:  

An electrocardiogram (ECG) printout shows multiple waveforms on a red grid. Leads I, II, III, aVR, aVL, aVF, V1-V8 are labeled. Text at bottom details speed, limb, and chest settings.
Image reproduced from Wikimedia Commons  

Which of the following is the most likely etiology of this patient’s clinical presentation?  

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