Hello and thanks for your post. Here is what I found on our site for you:
Low-Dose Aspirin Best for Preventing Heart Attack
What is the best dose for aspirin following angioplasty: 324mg or 81mg?
Aspirin at Bedtime Lowers Blood Pressure
Anti-Clotting Drug as Good as Aspirin at Stopping Second Stroke
Aspirin Resistance Boosts Heart Risks in Cardiac Patients
Hope this helps and all the best, sue