Recent Blog Articles

Long QT Syndrome

Updated: March 19, 2019

Long QT Syndrome  

What Is It?

by genes passed on to you from your parents. The electrical activity of heart cells is controlled by a set of channels that pump minerals, such as sodium and potassium, in and out of cells. If you inherit genes that cause alterations in these channels, it can affect the action of heart cells.

Normally, an electrical impulse starts in the sinus node, located in the upper chamber of the heart. The electrical impulse then travels down to the lower chambers of the heart, called the ventricles, causing contraction of the ventricles' muscle cells. This contraction causes the blood to flow out of your heart, like how squeezing a balloon filled with water, but not tied at the top, causes the water to squirt out the top.

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
Learn more about the many benefits and features of joining Harvard Health Online »

I'd like to receive access to Harvard Health Online for only $4.99 a month.

Sign Me Up

Already 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.