Recent Blog Articles

Cardiac Catheterization

Updated: December 06, 2019

What Is It?

Cardiac catheterization is a procedure in which a heart specialist inserts a small tube (catheter) through a large blood vessel in the arm or leg, and then passes the tube into the heart. Once inside the heart, doctors use the catheter to evaluate how the heart is working by measuring pressure and oxygen levels within the heart's chambers. Through the catheter, doctors inject a special dye that provides an X-ray image of the heart's internal structure and blood flow patterns.

The procedure is often done to look for narrowed and blocked coronary arteries. The X-ray dye also is injected into each of the three largest coronary arteries. This is called coronary angiography.

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.