January 8th Question
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A 78-year-old man presents to establish care on his implanted cardiac resynchronization therapy–defibrillator. He has history of permanent atrial fibrillation, ischemic cardiomyopathy, left bundle branch block, and chronic New York Heart Association functional class III congestive heart failure. He had primary prevention cardiac resynchronization therapy–defibrillator implanted 2 years ago …