A 63-year-old woman with a history of coronary artery disease presents with chest discomfort for 30 minutes that began at rest. ECG shows 1 mm ST depressions in leads V4 to V6 and T-wave inversions. High-sensitivity troponin is elevated. She is given aspirin, a P2Y12 inhibitor, and nitrates. What additional therapy should she receive early if no contraindications are present?