For the little ones who matter most

Alert Important Safety Information

The Medtronic Freezor™ and Freezor™ Xtra cardiac cryoablation catheters are a safe, effective, and FDA-approved treatment option for pediatric* AVNRT patients. 

*Indicated for patients over two years of age.

What is AVNRT?

Atrioventricular nodal reentrant tachycardia (AVNRT) is an abnormal heart rhythm condition and a form of supraventricular tachycardia (SVT) that affects both pediatric and adult individuals. With AVNRT, abnormal signals originate in the upper chambers of the heart, or the atria, causing a faster-than-normal heartbeat. If left untreated, AVNRT may progress and become a life-threatening condition that affects quality of life.

Normal heartbeat

Flow of electrical signals in a normal heartbeat

Illustration showing a human heart with arrows to show blood flow direction and normal EKG pattern

AVNRT heartbeat 

AVNRT with abnormal signals originating in the atria
Illustration showing a human heart with arrows to show blood flow direction and abnormal EKG pattern

How do I know if my child has AVNRT?

Signs and symptoms of AVNRT may include:
  • Heart sensations, sometimes called palpitations, which may include irregular, thumping, or pounding heartbeats
  • Dizziness
  • Fainting (syncope)
  • Chest pain
  • Shortness of breath
  • Feeling pulsations in your child's throat
  • Sudden sense of a fast heart rate and a sudden end to the fast heart rate

Your child may have no symptoms but still be diagnosed with AVNRT at a doctor's appointment. Even without symptoms, AVNRT is a serious medical condition.

How do I detect AVNRT?

Female child holding a stethoscope to a male physician's chest

Detecting AVNRT and quantifying it can be challenging. Your child’s doctor may use one or more of the following tests to determine if your child has AVNRT:

  • ECG
  • Holter monitor
  • Event monitor
  • Exercise test

Find a heart rhythm specialist, known as an electrophysiologist, who can determine if your child’s symptoms are a result of AVNRT.

Treating AVNRT with Freezor and Freezor Xtra

Freezor and Freezor Xtra cardiac cryoablation catheters on transparent background

Talk to your child’s doctor today to see if this treatment option is right for your child. The Medtronic Freezor and Freezor Xtra cardiac cryoablation catheters are the only FDA-approved option to treat pediatric AVNRT. This minimally invasive, established procedure has been used to safely treat over 114,000 patients worldwide.

Catheter ablation is the AVNRT treatment of choice. Talk to your child’s doctor to learn more about how studies have shown that catheter ablation is safe and effective and can be more effective than drug therapy as a treatment for AVNRT, and if this treatment option is right for your child.

Risks may include: bleeding and bruising where the catheter was inserted, temporary or permanent shortness of breath, infection, temporary or permanent stroke, complications that may lead to hospitalization or potentially death. Always talk with your child's doctor about diagnosis and treatment information.

Restoring life’s rhythm. Big and small.

Less worry. More play.

Catheter ablation can decrease episodes of AVNRT symptoms and can have a positive impact on daily activities, helping you get back to quality time with your child.

> 15 years of experience.

Everything you expect from an industry leader in cryoablation. This is a safe and effective technology that is now FDA approved to treat pediatric patients with AVNRT.

0% reported cases of permanent AV block.

The Freezor Xtra cardiac cryoablation catheter may reduce the risk of permanent atrioventricular (AV) block in children, with no pacemaker implants needed.

Patient stories

Learn about the Nelson sisters' journey with AVNRT and their experience with cryoablation.

Identical triplet teenage sisters standing together in gray sweatshirts at a ballpark

These patient stories are based on individual experiences. The experience other individuals have with the therapy could be different. Experiences vary. Please talk to your child's doctor about their condition and the risks and benefits of this therapy.

Find a pediatric EP specialist

Find a pediatric specialist near you by visiting the Pediatric & Congenital Electrophysiology Society (PACES) website.