A 72-year-old woman is evaluated for sharp chest pain that occurs randomly. She walks 3 to 4 miles daily, and her symptoms have never occurred with exertion. She has never smoked. Medical history is significant for hypertension, type 2 diabetes mellitus, and hyperlipidemia. Medications are low-dose aspirin, metformin, lisinopril, and simvastatin (10 mg/d). She has no known drug allergies.
On physical examination, blood pressure is 122/76 mm Hg, pulse rate is 76/min, and respiration rate is 12/min. Cardiac examination shows a normal S1 and S2; there is no S3, S4, murmur, or rub. The remainder of the examination is normal.
Laboratory findings include a serum total cholesterol level of 200 mg/dL (5.18 mmol/L), LDL cholesterol level of 126 mg/dL (3.26 mmol/L), and HDL cholesterol level of 50 mg/dL (1.30 mmol/L).
The patient's 10-year cardiovascular risk estimated with the Pooled Cohort Equations is greater than 10%.
An exercise treadmill test is administered for 8 minutes, 40 seconds. There are no electrocardiogram changes at rest or with exercise. She does not have chest pain during exercise or recovery.
Which of the following is the most appropriate management?