A 75-year-old male with angina pectoris lasting 4 hours. Nitroglycerin is ineffective. Electrocardiogram (ECG) shows 6mm ST-segment elevation in leads II, III, aVF with a concave upward pattern, and 4mm horizontal ST-segment depression in leads V1-3, with occasional ventricular premature beats. The most appropriate management for acute myocardial infarction (AMI) is: