Treatment for Your Child’s Hypoplastic Ventricle: Stage III (Fontan)

The goals of heart surgery for a hypoplastic ventricle

• Stage I. Make the single working ventricle the main pumping chamber of the heart and provide stable blood flow to the lungs. This will provide blood to both the lungs and the body. 

• Stage II. Decrease the workload of the single ventricle. This reduces the mixing of oxygen-poor and oxygen-rich blood. 

• Stage III. Separate the circulation of blood in the heart. This is so very little oxygen-rich and oxygen-poor blood mix.

What are the risks and possible complications?

Risks and possible complications include:

• Abnormal heart rhythm

• Problems in the lungs

• Infection

• Bleeding

• Problems with the nervous system, such as seizures or stroke

• Abnormal buildup of fluid around the heart or lungs

• Death

Stage III: The Fontan procedure

In a normal heart, oxygen-poor blood is pumped to the lungs from the right ventricle. Oxygen-rich blood is pumped to the body from the left ventricle.

The Fontan procedure sends oxygen-poor blood from the lower body directly to the lungs without being pumped by the ventricle.

This surgery is done when your child is 2 to 4 years old. Your child may stay in the hospital for 1 to 2 weeks. This part of the surgery is done to separate the circulation of blood in the heart. This is so oxygen-poor blood does not mix with oxygen-rich blood in the single ventricle. The surgeon will do one of these 2 repairs:

• Intracardiac Fontan. The inferior vena cava (IVC) is a large blood vessel. It brings oxygen-poor blood to the right atrium. A tube is built within the right atrium to make a baffle (tunnel). This is so that blood flows from the IVC directly to the pulmonary artery. This sends blood straight to the lungs to get oxygen. Sometimes, a small hole is left in the tunnel (fenestration). This hole acts like a pop-off valve, preventing pressure from building up in the lungs too much after surgery.

• Extracardiac Fontan. The IVC is sewn into a tube that is put outside the heart. The tube goes straight to the pulmonary artery. This lets oxygen-poor blood flow straight to the lungs to get oxygen. A fenestration may also be used in this case.

When should I call my child's healthcare provider?

Call your child's healthcare provider right away if any of the following occur:

• More redness, draining, swelling, or bleeding at the incision site

• Fever 100.4°F (38°C) or higher, or as advised by your provider

• Irritable

• Trouble feeding, poor appetite, or not gaining weight 

• Belly pain

• Tiredness

• Cough that won’t go away

• Nausea or vomiting that continue

• Your child doesn't seem to be getting better

• Cyanosis that gets worse

Call 911

Call 911 right away if any of these occur:

• Trouble breathing or breathing fast

• Unresponsiveness

• Irregular heartbeat