Patients who have heart issues and undergo a procedure to open blocked arteries often take two types of blood thinners. One is a drug called a P2Y12 inhibitor, and the other is aspirin. Doctors need to decide how long a patient should stay on both medicines before stopping the aspirin.
Stopping aspirin too early can increase the risk of a heart attack. However, staying on both drugs for too long can lead to dangerous bleeding. This study looked at over 58,000 patients to find the safest window for switching to a single medication.
Researchers found that the risk of a heart attack dropped significantly as the time on both drugs increased. Specifically, the risk became much lower after about 90 days. At the same time, the risk of serious bleeding dropped when patients stopped taking aspirin sooner.
While the exact number of days to stop aspirin can vary depending on the math model used, the data suggests a safer balance is found after several months. Doctors can use these findings to help decide the best timing for each individual patient's care plan.
Common questions
How much does shorter aspirin use raise heart attack risk after a stent?
In the pooled analysis, the odds ratio for heart attack versus 12 months of dual therapy was 1.31 at 0 days, 1.17 at 30 days, and 1.09 at 90 days. There were 929 heart attacks in total. Certainty was low for heart attack results below 90 days, so these are estimates, not fixed risks for any one person.
Does stopping aspirin early lower bleeding risk?
Yes, the analysis found major bleeding was less common with shorter dual therapy. The odds ratio for major bleeding was 0.40 at 0 days and 0.62 at 90 days, based on 1,102 major bleeding events. Certainty for bleeding was moderate. Your own bleeding and clotting risks depend on your health history, so discuss them with your doctor.
What is the shortest safe duration of dual antiplatelet therapy?
The analysis could not settle on one number. The shortest duration meeting the researchers' preset threshold was 158 days in one model and 282 days in another. A 30-day cutoff did not fit the data better. Because the models disagree and certainty was low, these figures should not be treated as a firm rule.
Should I stop aspirin after my stent?
This analysis does not give personal advice, and the decision depends on your heart attack risk, bleeding risk, and stent type. The findings suggest shorter aspirin use trades less bleeding for somewhat higher heart attack odds. Talk with your cardiologist before making any change to your antiplatelet medicines.
