Heart Beat: Heat and heart failure
Heart Beat
Heat and heart failure
Deadly heat waves in the United States and Europe taught us that people with heart failure are especially vulnerable to high temperatures. Although their heart trouble is clearly one reason they have trouble with the heat, blood vessels supplying the skin may contribute to it.
One way we cope with excess heat is by rerouting blood flow. Responding to signals from deep in the brain, blood vessels that supply the internal organs narrow. This limits circulation to the stomach, intestines, liver, and kidneys. At the same time, tiny arteries (arterioles) near the skin relax and open. As extra hot blood flows just below the skin, some of its heat escapes into the air.
To continue reading this article, you must log in.
Subscribe to Harvard Health Online for immediate access to health news and information from Harvard Medical School.
- Research health conditions
- Check your symptoms
- Prepare for a doctor's visit or test
- Find the best treatments and procedures for you
- Explore options for better nutrition and exercise
I'd like to receive access to Harvard Health Online for only $4.99 a month.
Sign Me UpAlready a member? Login ».
Disclaimer:
As a service to our readers, Harvard Health Publishing provides access to our library of archived content. Please note the date of last review or update on all articles.
No content on this site, regardless of date, should ever be used as a substitute for direct medical advice from your doctor or other qualified clinician.
