Practice Level 5 Case 112: A 73-Year-Old Man in the Arrhythmia Clinic History Diagnosis History A 73-year-old man is seen in arrhythmia clinic for routine follow-up. He is asymptomatic. His ECG is recorded below: Diagnosis Atrial fibrillation Intermittent left bundle branch block pattern secondary to phase IV block ECG ID: E802 Bookmark Please login to bookmark Username or Email Address Password Remember Me No account yet? Register