Skip to content

    Heart Disease Health Center

    Font Size

    Heart Catheterization for Congenital Heart Defects

    A heart catheterization is a procedure used for both diagnosis and treatment of congenital heart defects.

    As a test, this procedure allows doctors to see how blood flows through the heart chambers and arteries.

    As a treatment, the doctor can use special tools to fix a heart defect during this procedure.

    How is it done?

    Before the test, your child receives medicine to make him or her relax and sleep-sedatives or sometimes general anesthesia.

    A thin, flexible tube called a catheter is threaded through a blood vessel in the groin, or sometimes in another location, and into the heart. Through the catheter, the doctor can measure pressures, take blood samples, and inject a special dye (contrast material) into the chambers of the heart camera.gif or blood vessels. The doctor watches the movement of the dye through the heart's chambers and blood vessels.

    If the doctor is also going to treat a defect, special tools are moved through the catheter into the heart. The doctor uses these tools to correct the defect. Then the tools and the catheter are removed.

    A heart catheterization usually takes between 2 and 3 hours to complete. After the procedure, pressure must be applied over the catheter site for 10 to 20 minutes to stop bleeding and bruising. Then a large bandage might be used to apply pressure to the catheter site for 4 to 6 hours. Your child will need to lie as still as possible and keep the leg in which the catheter was inserted straight to prevent bleeding. You may need to hold your child in your lap after the test to prevent leg movement, or your child can wear a leg board with a Velcro strap to hold the leg still.

    Your child might be able to go home the same day. If the procedure is more complex, your child might stay in the hospital overnight.

    A heart catheterization might also be called angiography (angiogram), cardiac catheterization, or heart cath.

    Why It Is Done

    As a test

    A heart catheterization can be used to:

    • See details of the heart structure.
    • Measure pressures in the heart chambers and see how the blood is flowing through the heart.
    • Collect samples of blood from inside the heart.
    • Inject a dye into the heart or arteries to see whether there are abnormal blockages in the blood vessels or abnormalities of the heart chambers (such as defects or holes between chambers).

    As a treatment

    A heart catheterization can be used to fix certain types of heart defects. A few different types of procedures can be used during a catheterization. The type of procedure used depends on the type of defect. These procedures include:

    • Septostomy. For a septostomy, an opening is made in the wall of the heart between the upper chambers to allow blood to mix between the heart chambers. This procedure is typically used to treat transposition of the great vessels, tricuspid atresia, and hypoplastic left heart syndrome. It does not correct the congenital heart defect but allows oxygen-rich blood to get out to the body until surgery can be done to correct the defect.
    • Closing a defect. A doctor uses the catheter to insert a small closure device into the heart. This device prevents blood from flowing between chambers. This procedure might be done to treat an atrial septal defect, ventricular septal defect, or patent ductus arteriosus.
    • Balloon valvuloplasty. A doctor uses the catheter to move a tiny balloon to the heart valve. The doctor then inflates the balloon to widen the valve. The balloon separates and stretches the valve opening. This allows blood to flow more easily through the heart. This procedure can be used to treat pulmonary valve stenosis and aortic valve stenosis.
    • Balloon angioplasty. A doctor uses the catheter to move a tiny balloon into a blood vessel. The balloon is inflated to widen the vessel. This procedure can be used to treat narrowed blood vessels in the lungs or coarctation of the aorta.
    • Stents. A doctor can use the catheter to place a small, expandable tube (stent) in an artery. The stent keeps the artery open. Stents might be placed in arteries outside the heart, such as the pulmonary arteries or the aorta.


    In a child who has a congenital heart defect, a heart catheterization shows how the blood is flowing through the heart. The exact heart problem can be seen and sometimes treated during the same procedure or a later one.

    If your child has a complex heart defect, he or she might need a combination of surgery and catheterization to treat it.

    Your child will continue to see the doctor to be sure that his or her heart is working right. Many children with a heart defect that was treated live healthy lives with few or no restrictions. Your child will need regular checkups throughout life.

    What To Think About

    Complications related to the catheter include:

    • Pain, swelling, and tenderness at the catheter insertion site.
    • Irritation of the vein by the catheter.
    • Bleeding at the catheter site.
    • A bruise where the catheter was inserted. This usually goes away in a few days.

    Serious complications are rare, but they can be life-threatening. These complications may include:

    Your child might need other tests, such as an MRI or a CT scan, so that the doctor can fully understand your child's heart defect.

    Complete the medical test information form (PDF)(What is a PDF document?) to help you prepare for this test.

    Related Information

    Other Works Consulted

    • Feltes TF, et al. (2011). Indications for cardiac catheterization and intervention in pediatric cardiac disease: A scientific statement from the American Heart Association. Circulation, 123(22): 2607-2652.

    ByHealthwise Staff
    Primary Medical ReviewerJohn Pope, MD - Pediatrics
    Specialist Medical ReviewerLarry A. Latson, MD - Pediatric Cardiology

    Current as ofMarch 12, 2014

    WebMD Medical Reference from Healthwise

    Last Updated: March 12, 2014
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

    Today on WebMD

    x-ray of human heart
    A visual guide.
    atrial fibrillation
    Symptoms and causes.
    heart rate graph
    10 things to never do.
    heart rate
    Get the facts.
    empty football helmet
    red wine
    eating blueberries
    Simple Steps to Lower Cholesterol
    Inside A Heart Attack
    Omega 3 Sources
    Salt Shockers
    lowering blood pressure