Ventricular 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 67-year-old male presents to the emergency department after a confirmed cardiac arrest in the field. Per EMS, the patient was found down by several bystanders without a pulse, and CPR was initiated immediately. The patient has no past medical history and is not on any medications. He is currently without a pulse, and CPR is ongoing. His 12 lead electrocardiogram is demonstrated below:  

An electrocardiogram (ECG) shows continuous, rapid, chaotic waveforms across multiple leads, indicating ventricular fibrillation. It is on a red grid background.

Image reproduced from Wikimedia Commons   

The patient is shocked multiple times and dies despite resuscitation efforts. Post-mortem analysis is most likely to demonstrate which of the following as the etiology of this patient’s clinical presentation?  

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