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Warfarin or aspirin: both or others?
1Department of Medicine, Monash Medical Centre, and Monash University, Melbourne, VIC. roger.peverill@med.monash.edu.au
The Medical Journal of Australia
|November 24, 1999
Summary
Aspirin prevents thrombosis in high shear conditions like atherosclerosis, while warfarin is used for stasis, such as in atrial fibrillation. Combined use is beneficial for specific patients, like those with mechanical heart valves.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Aspirin is indicated for thrombosis prevention in high shear rate conditions (e.g., atherosclerosis).
- Warfarin is indicated for thrombosis prevention in stasis conditions (e.g., atrial fibrillation).
Purpose of the Study:
- To outline the indications and contraindications for aspirin and warfarin use.
- To discuss the combined use of aspirin and warfarin in specific patient populations.
- To provide guidance on oral anticoagulant therapy for atrial fibrillation.
Main Methods:
- Review of current guidelines and clinical evidence for antiplatelet and anticoagulant therapies.
- Analysis of patient populations benefiting from combined aspirin and warfarin therapy.
- Discussion of therapeutic international normalized ratio (INR) ranges and contraindications.
Main Results:
- Aspirin (75-150 mg/day) prevents vascular events in ischemic heart disease and high-risk patients.
- Warfarin is recommended for atrial fibrillation, with a target INR of 2.0-3.0, balancing thromboembolism and bleeding risks.
- Combined aspirin and warfarin use is beneficial in select cases, such as mechanical heart valve prostheses.
Conclusions:
- Aspirin and warfarin have distinct primary indications but can be combined judiciously.
- Oral anticoagulation with warfarin is crucial for atrial fibrillation patients, with careful risk assessment.
- Warfarin use in pregnancy requires careful consideration, especially for mechanical valve prostheses in the second and third trimesters.