A 52-year-old woman with acute myocardial infarction is admitted to the coronary care unit. She receives aspirin and is being considered for thrombolytic therapy. The cardiologist notes that her troponin I is rising (0.8 ng/mL at 3 hours, 2.1 ng/mL at 6 hours), and her ejection fraction is 35% on echocardiography. She has no contraindications to thrombolysis. However, the interventional cardiology team is 90 minutes away. Which of the following is the most appropriate next step in management?