For decades, aspirin has been one of the most commonly used medicines to help prevent heart attacks and strokes in people with heart disease.
Millions of people around the world take a low dose of aspirin every day after a heart attack, after receiving a heart stent, or after being diagnosed with coronary artery disease.
Aspirin works by making blood platelets less sticky, helping to prevent blood clots that can block blood flow to the heart or brain.
However, new research suggests that another well-known blood thinner, called clopidogrel, may provide even better long-term protection for many people with coronary artery disease, also known as CAD.
The findings come from a large analysis of clinical trials and could influence the way doctors choose long-term treatment for heart disease in the future.
The research was published in the medical journal The Lancet.
Coronary artery disease develops when fatty deposits, known as plaques, build up inside the arteries that supply blood to the heart. As these arteries become narrower, less oxygen-rich blood reaches the heart muscle.
This can cause chest pain, called angina, and greatly increases the risk of a heart attack. If a clot blocks blood flow to the brain, it can also cause a stroke. Coronary artery disease remains one of the leading causes of death worldwide.
Because the condition is lifelong, many patients need to take blood-thinning medicine every day to lower the risk of future heart attacks and strokes.
Aspirin has traditionally been the standard treatment because it is inexpensive, widely available, and has been proven to reduce the risk of serious cardiovascular events.
In the new study, researchers combined the results of seven high-quality clinical trials involving nearly 29,000 people with coronary artery disease. By combining information from many studies, the researchers were able to obtain a clearer picture of how clopidogrel compares with aspirin over the long term.
The results showed that people taking clopidogrel had a 14% lower risk of major cardiovascular events, including heart attacks and strokes, compared with people taking aspirin. This suggests that clopidogrel may provide stronger protection against dangerous blood clots in patients with established heart disease.
One of the biggest concerns with any blood thinner is the possibility of serious bleeding. Since these medicines reduce the blood’s ability to clot, doctors must always balance the benefits of preventing clots against the risk of excessive bleeding.
Encouragingly, the researchers found that people taking clopidogrel did not have a higher risk of major bleeding than those taking aspirin. This means the additional protection did not appear to come with extra safety concerns.
The study included a wide range of patients. Some had previously received coronary stents to keep blocked arteries open, while others had experienced heart attacks or other serious forms of heart disease.
The researchers also examined whether genetic differences or other medical conditions affected how well clopidogrel worked. Even among patients who were expected to respond less strongly to clopidogrel, the medicine still performed better than aspirin overall.
Although these findings are promising, the researchers say more work is needed before treatment guidelines are changed everywhere.
Future studies will examine how cost-effective clopidogrel is, whether the benefits remain consistent in larger and more diverse populations, and which patients are most likely to benefit from one medicine over the other.
People who currently take aspirin should not stop or switch medicines without first speaking to their doctor. The best treatment depends on many factors, including a person’s medical history, bleeding risk, other medications, and overall health.
Decisions about blood-thinning medicines should always be made with a healthcare professional.
The new research offers hope that long-term treatment for coronary artery disease may continue to improve. As scientists learn more about the safest and most effective ways to prevent blood clots, millions of people living with heart disease may benefit from better protection against heart attacks and strokes while maintaining a good quality of life.
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