Practice Level 4 Case 147: A 56-Year-Old Man in the CCU History Diagnosis History This 56-year-old man developed an arrhythmia one hour after his admission to the coronary care unit: Diagnosis Sinus rhythm with second degree AV block Mobitz I (4:3)Acute inferior myocardial infarction ECG ID: E230 Bookmark Please login to bookmark Username or Email Address Password Remember Me No account yet? Register