Summer heat forces heart to work harder, raising cardiac event risk, expert says

Extreme summer heat can weigh heavily on the body and mind.

Skyrocketing temperatures can have a severe impact on heart health in particular — especially for people with pre-existing conditions. 

Adedapo Iluyomade, M.D., a cardiologist with Miami Cardiac & Vascular Institute, part of Baptist Health South Florida, noted that hot weather causes the heart to work harder.

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“When our bodies heat up, blood vessels near the skin widen and send more blood outward to help cool us down,” he said in an interview with Fox News Digital. 

“To keep blood pressure steady, the heart speeds up and works harder, raising its oxygen demand.”

Hot weather can increase the risk of heart attacks, experts warn. (iStock)

Heat puts extra strain on the heart and can cause dehydration or blood-thickening, which may trigger symptoms or events, according to Iluyomade.

The cardiologist referenced a recent analysis of more than 6,000 heat exposure cases, which found that “even small rises” in core temperature can increase heart rates by nearly 30 beats per minute.

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“Studies show that each 1 °C rise in temperature raises cardiovascular death risk by roughly 2%, and heat waves markedly increase the chance of heart attacks, heart failure and irregular rhythms,” he said.

“[It’s] enough to cause silent heart attacks in people with pre-existing coronary artery disease.”

People with heart conditions should keep aware of rising temperatures and resulting symptoms, doctors advise. (iStock)

Some heart medications can also “exaggerate” how the body responds to heat, according to the American Heart Association (AHA).

For those who are living with heart conditions — such as coronary artery disease, heart failure, high blood pressure or arrhythmias — Iluyomade recommends taking precautions during the summer months.

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To avoid a cardiac event, it’s best to avoid going outside during the hottest part of the day, to stay hydrated (including electrolytes), and to stay in cool, shaded areas, the cardiologist said. 

Cardiologists recommend staying hydrated and cool to avoid cardiac events during hot summer months. (iStock)

Even people who do not have existing heart problems should pay attention to warning signs of heat-related cardiac stress.

“Watch for concerning signs like chest tightness, increasing shortness of breath, racing heart, leg swelling or feelings of faintness,” Iluyomade advised.

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Other red flags can include unusual feelings of fatigue, a sense of the heart pounding even during periods of rest, dizziness, nausea or confusion.

“[It’s] enough to cause silent heart attacks in people with pre-existing coronary artery disease.”

The AHA also notes additional signs of heat stroke, including high body temperature (103 degrees Fahrenheit or higher) and hot, red, dry or damp skin.

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Iluyomade concluded, “Keep hydrated, take breaks in air-conditioned or shaded spots, avoid heavy effort during midday hours, and wear light, breathable clothing to help your heart manage summer heat.”