A 65-year old Caucasian man presents to the emergency room with a crushing substernal chest pain. He states the pain started 30 minutes before and he has never had an episode like this before. He is a smoker and has a history of diabetes. His mother had a myocardial infarction at 60 years of age. He takes insulin for his diabetes but no other medications including over-the-counter medications. He has no known allergies. His initial cardiac troponin was negative and his ECG reveals ST depression that measures 0.8 mm in anterior the leads. According to his TIMI score, which of the following is the most appropriate management? A. Administer 300 mg of clopidogrel
B. Discharge the patient home with close follow up
C. Measure serial cardiac troponin levels
D. Perform an immediate percutaneous intervention