A 63-year-old woman with a 4 year history of coronary artery disease is in the cardiac clinic for reassessment. She is stable, with infrequent mild angina on exertion:

• Sinus tachycardia with frequent non-conducted premature atrial complexes (PAC)
• Left axis deviation
• Lateral myocardial infarction, age undetermined
• Inferior-posterior myocardial infarction, age undetermined