An 82-year-old man is admitted to hospital 30 minutes after he lost consciousness for 30 seconds. His wife reports that he recently recovered from a viral illness. Physical examination shows no evidence of tongue biting. Vitals are: temperature 98.4F, HR 36, BP 96/60. Heart sounds are dual with no added sounds. Lung fields are clear to auscultation bilaterally. A pacemaker is recommended as the next best step in management. Which of the following is the most likely diagnosis?
First-degree heart block
Mobitz type I (Wenckebach)
Mobitz type II
Third-degree heart block
Fourth-degree heart block
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Cut-to-the-chase Answer (0:31):
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HY USMLE Answer (2:29):
