The latest COVID vaccine is already known for helping prevent severe illness, but new research suggests it may do something else that has caught doctors' attention. A large U.S. study found that people who received the updated vaccine had fewer serious heart problems linked to COVID-19 than those who skipped it.

The findings add another reason for older adults and people with existing health conditions to stay current with vaccination. Researchers say preventing COVID-19 may also reduce the inflammation that can trigger dangerous cardiovascular events. While more research is still needed, the results offer another promising look at how vaccines can protect overall health.

The study examined health records from the U.S. Department of Veterans Affairs. Researchers compared nearly 350,000 veterans who received both the updated COVID vaccine and the seasonal flu shot with almost 700,000 veterans who received only the flu vaccine.

Participants were followed for about eight months after vaccination. Most were around 70 years old, and the majority were men. That gave researchers a large amount of real-world data to study how vaccination affected health outcomes after COVID infections.

The team focused on major adverse cardiovascular events, a medical term used to describe serious heart-related complications. These include cardiovascular death, heart attacks, strokes, and hospitalizations for heart failure.

After comparing both groups, researchers found a clear difference. Veterans who received the updated COVID vaccine experienced significantly fewer major cardiovascular problems associated with COVID than those who received only the flu shot.

Heart Attack Risk Dropped Significantly

Shvets / Pexels / Researchers reported that vaccinated participants had about a 38.5% lower risk of suffering a COVID-related heart attack during the study period.

Hospitalizations for heart failure also declined. According to the research, people who received the updated vaccine were about 41.9% less likely to be hospitalized for heart failure linked to COVID infection. The most dramatic improvement involved cardiovascular deaths. Researchers found a nearly 58% reduction in deaths caused by serious heart-related complications associated with COVID.

Stroke results looked different. Although vaccinated participants showed a lower rate of strokes, the difference was not large enough for researchers to confirm that the vaccine directly reduced stroke risk in this study.

Why COVID Can Affect the Heart?

COVID is much more than a respiratory illness. Doctors have known since the early days of the pandemic that the virus can trigger widespread inflammation throughout the body. This includes the heart and blood vessels.

That inflammation may increase blood clotting and place extra stress on the cardiovascular system. It can also destabilize fatty plaque inside arteries, making heart attacks and heart failure more likely.

Doctors believe vaccines help by reducing the chance of severe infection. When infections become milder, the body experiences less inflammation, lowering the risk of complications that can affect the heart.

Cardiologists say these new findings fit with what has already been seen with other vaccines. Preventing serious infections often helps reduce the risk of dangerous cardiovascular events that sometimes follow those illnesses.

Older Adults Saw the Greatest Benefit

Print / Pexels / Researchers estimated that the updated vaccine reduced COVID-associated major cardiovascular events by more than 50% in this age group.

That is especially important because older adults already face a higher risk of heart disease, hospitalization, and severe COVID. Even a modest reduction in complications can make a meaningful difference for this population.

People with existing medical conditions also appeared to benefit. Those living with chronic illnesses such as heart disease, diabetes, or other cardiovascular risk factors often experience worse outcomes after COVID infections.

The findings suggest that staying current with vaccination may offer another layer of protection for people whose health is already under added strain. Doctors say it is one more factor to consider when discussing vaccines with a healthcare provider.