A 70-year-old man with a history of coronary artery disease presents to the emergency department with 2 hours of substernal chest pressure, diaphoresis, and nausea. He reports difficulty "catching his breath." An electrocardiogram shows septal T-wave inversion. The patient is given 325 mg aspirin and sublingual nitroglycerin while awaiting the results of his blood work. His troponin I is 0.65 ng/mL (normal <0.04 ng/mL). The physician in the emergency department starts the patient on low-molecular-weight heparin. His pain is 3/10. Blood pressure is currently 154/78 and heart rate is 72. You are asked to assume care of this patient. What is the best next step in management?
Arrange for emergent cardiac catheterization Begin intravenous thrombolytic therapy Admit the patient to a monitored cardiac bed and repeat cardiac enzymes and ECG in 6 hours Begin intravenous beta-blocker therapy