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MMLU / A 54-year-old man comes to the physician because of episodes of fainting for 3…

Problem

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question

A 54-year-old man comes to the physician because of episodes of fainting for 3 months. He also has had difficulty performing daily tasks because he is easily fatigued. He had a myocardial infarction 12 years ago. His pulse is 40/min, respirations are 18/min, and blood pressure is 138/85 mm Hg. Physical examination shows evidence of cannon a waves. An ECG shows a P-wave rate of 90/min, and an R-wave rate of 40/min, with no apparent relation between the two. Which of the following is the most likely diagnosis?

choices

  1. Right bundle branch block
  2. Second-degree atrioventricular block, type I
  3. Second-degree atrioventricular block, type II
  4. Third-degree atrioventricular block

subject

professional_medicine

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