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Course: A Case of Right Bundle Branch Block With Changing Axis

CME Credits: 1.00

Released: 2022-11-30

A man in his 80s with a history of heart failure with preserved ejection fraction, permanent atrial fibrillation, and coronary artery bypass graft 10 years ago presented with recurrent presyncope and bradycardia. Review of prior physician encounters revealed reports of lightheadedness and electrocardiograms (ECGs) with atrial fibrillation with ventricular rates of 40 to 50 beats per minute. Current medications included carvedilol, 25 mg, twice daily and apixaban, 5 mg, twice daily. An ECG (, A) showed atrial fibrillation with an irregular ventricular rate of around 60 beats per minute, right bundle branch block (RBBB), and left posterior fascicular block (LPFB).


Educational Objective
Based on this clinical scenario and the accompanying image, understand how to arrive at a correct diagnosis.


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