Extreme heat and cold represent growing cardiovascular risks that can trigger heart attacks, strokes, heart failure, and sudden cardiac death, according to a scientific statement published in Circulation by the American Heart Association. Experts from Weill Cornell Medicine and other leading institutions warn that as extreme heat events increase in frequency, intensity, and duration, they may soon outweigh traditional cold-related cardiovascular mortality.
Why Are Temperature Extremes Dangerous for the Heart?
When temperatures soar, the body attempts to cool itself by widening blood vessels and increasing sweat production. According to the American Heart Association, this process lowers blood pressure and reduces body fluid levels, forcing the heart to beat faster and pump harder to compensate. For individuals with existing cardiovascular disease, this added stress can trigger a heart attack.
The danger is compounded by common medical treatments. Many heart medications, such as diuretics, further reduce body water levels, potentially worsening the strain on the heart during heatwaves. Dr. Arnab Ghosh, an associate professor of medicine at Weill Cornell and an internist at NewYork-Presbyterian/Weill Cornell Medical Center, notes that the medical community currently lacks clear guidelines on whether doctors should adjust these prescriptions during extreme heat events.
Who Is Most Vulnerable to Heat-Related Cardiovascular Stress?
Older adults are at the highest risk because the natural aging process reduces the body’s ability to regulate temperature. Beyond the elderly, the risk extends to pregnant individuals, infants, outdoor workers, and people with low incomes. According to the American Heart Association, low-income populations often face heightened danger due to limited access to air conditioning and a lack of shade in their living environments.
Did you know?
The year 2024 was the warmest on record since the National Oceanic and Atmospheric Administration began tracking global temperatures in 1880.
How Can the Healthcare System Adapt?
The healthcare industry faces a paradox: while it strives to improve patient outcomes, it accounts for approximately 8.5% of greenhouse gas emissions in the United States. Everything from the energy-intensive operation of MRI machines to the gases used in surgery contributes to the carbon footprint.
Dr. Ghosh emphasizes that the system needs a fundamental redesign to remain effective while becoming more sustainable. Potential solutions include:
- Expanding Telehealth: Reducing the need for travel to and from appointments to lower carbon emissions.
- Optimizing Resource Use: Encouraging providers to be more conservative with disposable equipment and recommended procedures.
- Urban Greening: Planting dense, continuous tree canopies near homes and public spaces, which research—including work by Dr. Ghosh published in Nature Communications—identifies as the most effective way to cool urban areas.
Pro Tip:
If you are on heart medication, talk to your doctor about how to manage your health during heatwaves. Ask if your specific dosage requires extra caution during periods of extreme temperature.
Frequently Asked Questions
Why does heat affect the heart more than it used to?
While cold weather has historically caused more deaths due to its frequency, extreme heat events are becoming more intense and frequent. Experts warn that heat-related mortality is rising and may soon surpass cold-related deaths.
What policy changes are needed to protect public health?
The American Heart Association suggests that policymakers must prioritize affordable energy to ensure air conditioning access and establish cooling centers for vulnerable residents.
Can trees actually lower heart health risks?
Yes. According to research involving Dr. Ghosh, creating dense, continuous tree canopies in neighborhoods and along streets provides cooling that directly benefits residents by reducing exposure to extreme heat.
Are you concerned about how local climate shifts might affect your health? Share your thoughts in the comments below or reach out to your primary care provider to discuss a personal safety plan for the summer months.
