A 58-year-old man is admitted to the coronary care unit with severe central anterior chest pain of 4 hour duration. This ECG tracing is recorded 2 hours after his admission:

• Sinus rhythm, 90/min
• Complete heart block,with escape junctional rhythm, 47/min
• Acute inferior myocardial infarction
• ST depression in V2 (posterior wall injury pattern, consider acute posterior infarction)