Abstract:
OBJECTIVE:The use of aspirin for primary prevention of cardiovascular events in the general population is controversial. The purpose of this study was to create a versatile model to evaluate the effects of aspirin in the primary prevention of cardiovascular events in patients with different risk profiles. DESIGN:A Markov decision-analytic model evaluated the expected length and quality of life for the cohort's next 10 years as measured by quality-adjusted survival for the options of taking or not taking aspirin. SETTING:Hypothetical model of patients in a primary care setting. PATIENTS:Several cohorts of patients with a range of risk profiles typically seen in a primary care setting were considered. Risk factors considered included gender, age, cholesterol levels, systolic blood pressure, smoking status, diabetes, and presence of left ventricular hypertrophy. The cohorts were followed for 10 years. Outcomes were myocardial infarction, stroke, gastrointestinal bleed, ulcer, and death. MAIN RESULTS:For the cases considered, the effects of aspirin varied according to the cohort's risk profile. By taking aspirin, the lowest-risk cohort would be the most harmed with a loss of 1.8 quality-adjusted life days by taking aspirin; the highest risk cohort would achieve the most benefit with a gain of 11.3 quality-adjusted life days. Results without quality adjustment favored taking aspirin in all the cohorts, with a gain of 0.73 to 8.04 days. The decision was extremely sensitive to variations in the utility of taking aspirin and to aspirin's effects on cardiovascular mortality. The model was robust to other probability and utility changes within reasonable parameters. CONCLUSIONS:The decision of whether to take aspirin as primary prevention for cardiovascular events depends on patient risk. It is a harmful intervention for patients with no risk factors, and it is beneficial in moderate and high-risk patients. The benefits of aspirin in this population are comparable to those of other widely accepted preventive strategies. It is especially dependent on the patient's risk profile, patient preferences for the adverse effects of aspirin, and on the level of beneficial effects of aspirin on cardiovascular-related mortality.
journal_name
J Gen Intern Medjournal_title
Journal of general internal medicineauthors
Augustovski FA,Cantor SB,Thach CT,Spann SJdoi
10.1046/j.1525-1497.1998.00246.xsubject
Has Abstractpub_date
1998-12-01 00:00:00pages
824-35issue
12eissn
0884-8734issn
1525-1497journal_volume
13pub_type
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abstract:BACKGROUND:Population-based strategies can expand the reach of tobacco cessation treatment beyond clinical encounters. OBJECTIVE:To determine the effect of two population-based tobacco cessation strategies, compared with usual care, on providing tobacco treatment outside of clinical encounters. DESIGN:3-arm pragmatic...
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更新日期:1996-06-01 00:00:00
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