Hot weather does more than make people feel uncomfortable. It can also place extra strain on the heart and blood vessels.
Doctors from Vanderbilt University Medical Center say that rising temperatures, air pollution and other environmental changes are becoming increasingly important threats to heart health.
Their work, including a review published in Circulation: Heart Failure, highlights why people should pay closer attention to environmental conditions and take simple steps to protect themselves.
Heart disease remains the leading cause of death worldwide. Most people know about common risk factors such as smoking, unhealthy eating, high blood pressure and lack of exercise. However, scientists now recognize that the environment is another important factor.
Heat waves, polluted air, wildfire smoke, hurricanes and extreme cold can all increase the workload on the heart and raise the risk of serious problems.
During hot weather, the body must work hard to stay cool. Blood vessels near the skin widen so heat can escape, forcing the heart to pump more blood.
At the same time, people lose water through sweating, making the blood thicker and increasing the chance of blood clots. This combination places extra stress on the cardiovascular system. Studies show that deaths linked to heart disease can rise by 12% to 17% during heat waves.
Dr. Andrew Chang explains that heat itself is not the only concern. High temperatures also increase the risk of heart attacks and strokes. As climate change makes extreme heat more common, understanding these dangers becomes increasingly important.
Air pollution is another major threat. Tiny particles released by traffic, factories and fires can enter the lungs and bloodstream. Worldwide, air pollution contributes to more than eight million deaths every year, with nearly 70% related to cardiovascular disease. Research has shown that even one hour of exposure to high levels of particle pollution can increase the risk of heart attack and stroke.
Dr. Lavanya Bellumkonda and colleagues reviewed evidence showing that people with heart failure experience worse health outcomes when exposed to polluted air. She believes doctors should treat air pollution as a risk factor that can be reduced, just like poor diet or physical inactivity.
The effects are not limited to people already living with heart disease. Dr. Chang’s research found that even healthy older adults exposed to slightly higher levels of air pollution over many years showed subtle changes in heart muscle function on advanced ultrasound scans. This suggests damage may begin long before symptoms appear.
The researchers encourage healthcare professionals to ask patients about their environment, including where they live, whether they work outdoors, how they travel to work and whether they live near busy roads. These questions can help identify people who may benefit from practical advice.
Simple protective measures include drinking enough water during hot weather, visiting air-conditioned cooling centres, avoiding outdoor exercise during extreme heat, checking air-quality reports, using indoor air filters and wearing a well-fitting N95 mask when pollution levels are high. These actions may reduce stress on the heart.
Overall, the evidence suggests environmental exposures deserve much more attention in routine healthcare.
Although this article summarizes existing research rather than reporting a new clinical trial, it highlights a growing body of evidence that climate and pollution affect cardiovascular health.
More studies are needed to identify the most effective prevention strategies, but current knowledge already supports practical actions that can reduce risk for both healthy people and those living with heart disease.
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Source: Vanderbilt University Medical Center.
