Hypoplastic Left Heart Syndrome Surgery: The Norwood Procedure
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Hypoplastic Left Heart Syndrome Surgery: The Norwood Procedure

Why Does a Baby Need the Norwood Procedure?

Without medicines and a series of three surgeries to rebuild the heart, babies with hypoplastic left heart syndrome (HLHS) won't survive. The left side of the heart can't be fixed, so the goal of the surgeries is to rebuild parts of the heart and "redirect" the way blood flows.

Illustration: Babies with HLHS need surgery because of these problems

The first surgery is called the Norwood procedure. It’s usually done when a baby is around 1–2 weeks old.

What Is the Norwood Procedure?

The Norwood procedure is a type of open-heart surgery. The goals are to:

  • Build a new aorta (the main path from the heart to the body).
  • Make the right ventricle pump blood to the body through the new aorta.
  • Make the right ventricle pump blood to the lungs through a new path to the pulmonary artery (the main path from the heart to the lungs).

What Happens During the Norwood Procedure?

The main steps of the Norwood procedure are:

  • Building a new, larger aorta. The bottom part of the pulmonary artery is joined with the baby's weak, undeveloped aorta. This new aorta is now the path from the right ventricle to the body.

Because the bottom of the pulmonary artery is used to make the new aorta, a new path from the heart to the lungs has to be built by:

  • Using a shunt to get blood to the lungs. A round tube or "shunt" routes blood either from the aorta (with a Blaylock-Taussig or BT shunt) or directly from the right ventricle (with a Sano shunt) to the pulmonary artery. The care team will decide which shunt is best for the baby.

Illustration showing what happens during the Norwood Procedure

The shunt is a temporary fix. It helps the baby get blood to the lungs until the next surgery, which creates a more permanent solution.

  • Closing the patent ductus arteriosus (PDA). Until now, the PDA was the only way blood could flow to the body. Now that the right ventricle has taken over pumping to the body, the PDA isn't needed anymore.
  • Opening the atrial septal defect. To make sure blood with oxygen gets back to the right ventricle, the atrial septal defect is made bigger.

    Illustration: After the Norwood procedure, blood reaches the lungs through the shunt.

What Happens After the Norwood Procedure?

Babies who have the Norwood procedure usually spend 3 to 4 weeks in the hospital to recover. They get-around-the-clock care and monitoring. They also get medicines to help the heart and improve blood flow.

During this time, the care team teaches parents how to care for their baby at home. Babies usually can go home when they are feeding well, growing well, and gaining weight.

At home, the baby needs to be watched closely. Parents will be in close contact with the care team, and should keep an eye on:

  • weight gain and growth
  • oxygen levels

Parents should call the care team right away if their baby:

  • has feeding problems
  • has breathing problems
  • seems very irritable
  • just doesn't seem quite right

What's the Next Procedure?

The second surgery is called the Glenn procedure. It's usually done when a baby is 4 to 6 months old.

Date reviewed: November 2018