A 74-year-old woman complains of heaviness in her chest, nausea, and sweating that suddenly began about an hour ago. She is conscious and alert but anxious. Her BP is 144/84 mm Hg and her heart rate is 110 bpm. She took two of her prescribed nitroglycerin (0.4mg tablets) before your arrival but still feels heaviness in her chest. What should you do?
1) administer another dose of nitroglycerin
2) Administer aspirin
3) Administer oxygen
4) Administer morphine