A 35-year-old man with a history of hypertension treated with a beta-blocker presents to his primary care provider for a routine physical examination. He has no complaints, and physical examination is unremarkable except for some variability in the intensity of S1 and evidence of cannon A waves in the neck. An ECG is obtained.
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Cite this: ECG Challenge: A Routine Check-up Reveals Cardiac Abnormalities - Medscape - Mar 01, 2021.