Atrioventricular block 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 68-year-old woman presents to the emergency department for evaluation of intermittent dizziness and palpitations for two weeks. Past medical history is significant for an acute myocardial infarction 6 months ago. Current medications include aspirin, atenolol, rosuvastatin, and ramipril. Temperature is 36.7°C (98.6°F), blood pressure is 125/76 mmHg, pulse is 46/min and irregular, respiratory rate is 18/min, and oxygen saturation is 96% on room air. On physical examination, she appears alert and in no acute distress. Cardiac examination reveals an irregular rhythm with normal S1 and S2, and no murmurs, rubs, or gallops. Lungs are clear to auscultation bilaterally and neurological examination is normal. Lead V1 from the patient’s ECG  is shown below. Which of the following is the most likely diagnosis?  


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