Approach to tachycardia 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 38-year-old man presents to the emergency department due to palpitations and shortness of breath for the past two hours. The patient has never experienced an episode like this and has no family history of heart disease. He was in his usual state of health prior to this episode. The patient has no significant past medical history and takes no medications. Vital signs and ECG are obtained by nursing staff while you examine the patient. The patient appears anxious and uncomfortable. Palpation of the radial pulse reveals a regular and rapid heart rate. After reviewing the electrocardiogram you suspect AV nodal reentrant tachycardia. Which of the following findings is most likely to be seen on ECG?

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The absence of typical P waves and sawtooth waves in leads III and aVF

Prolonged QT interval and progressive sinusoidal alterations of the QRS axis

QRS <120 ms and P waves buried in the QRS complexes

QRS <120 ms, irregular R-R intervals, and no visible P waves

QRS >120 ms and atrioventricular dissociation