Aspirin, in doses of less than 75 to 81 mg/d, can reduce the incidence of cardiovascular events. The U.S. Preventive Services Task Force 'strongly recommends that clinicians discuss aspirin chemoprevention with adults who are at increased risk for coronary artery disease'.
The Task Force defines increased risk as 'Men older than 40 years of age, postmenopausal women, and younger persons with risk factors for coronary artery disease (for example, hypertension, diabetes, or smoking) are at increased risk for heart disease and may wish to consider aspirin therapy'. More specifically, high-risk persons are 'those with a 5-year risk ≥ 3%'. A risk calculator is available.
Regarding healthy women, the more recent Women's Health Study randomized controlled trial found insignificant benefit from aspirin in the reduction of cardiac events; however there was a significant reduction in stroke. Subgroup analysis showed that all benefit was confined to women over 65 years old.
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