This trial will look at women with stable heart disease who don't have blockages in their coronary arteries. A substantial proportion of these patients have ischemia (reduced blood flow) based on symptoms or stress testing. This may be due to microvascular dysfunction, which is an abnormal function of the tiny arteries in the heart. The mechanisms and optimal treatment of coronary microvascular dysfunction are unknown. This trial will evaluate the association between platelet activity, inflammation, and microvascular dysfunction.