As a parent, I understand how heavy and scared you must feel when your doctor tells you that your newborn baby has a heart defect called Hypoplastic Left Heart Syndrome (HLHS). It must have felt like your whole world had suddenly come crashing down. But don't worry. Today, medical science has advanced a lot. The Norwood Procedure is a very important first step in giving life to such babies. Today, we will talk about this in a simple way that you can understand, so that you can ease your fears.
What is the Norwood Procedure?
Simply put, the Norwood procedure is a special heart surgery performed on babies with a congenital (born with) heart condition called Hypoplastic Left Heart Syndrome (HLHS) .
Think of it like a small house with four rooms. It has two parts, the right side and the left side. Normally, the left side of the heart pumps clean, oxygen-rich blood to the entire body. The right side pumps the deoxygenated blood from the body back to the lungs to be oxygenated.
However, the left side of a baby's heart with HLHS doesn't develop properly . That means that side is very small and weak. So that side can't pump blood to the body. This is the biggest problem.
The Norwood procedure does something amazing. Doctors create new pathways for blood to flow through the heart. That is, they redirect the work that the left side of the heart needs to do to the right side, which is working well . After the surgery, the baby's right ventricle starts pumping oxygenated blood to the entire body, as well as sending blood to the lungs.
This is not a complete cure. However, it is an essential first step in saving the baby's life. This helps to regulate the blood flow so that the baby's cells receive the necessary amount of oxygen.
Who needs this surgery?
This surgery is mainly needed for babies with Hypoplastic Left Heart Syndrome (HLHS) . They need to have this surgery within the first two weeks of birth.
At birth, every baby has a small connection between the two main blood vessels in the heart (aorta and pulmonary artery). This is called a `patent ductus arteriosus`. This allows a baby with HLHS to get some blood to their body for the first few days. However, this connection will naturally close after a few days. If this happens, the baby will have no way to get blood to their body, which is very dangerous.
Therefore, the first thing doctors do is to give a special medicine (called `Prostaglandin`) to keep the blood vessel from closing. But that is temporary. The Norwood operation is performed as a permanent solution.
Sometimes, this surgery may not be possible for babies who are born prematurely, have low birth weight, or have other complications. In such cases, doctors use other methods, such as pulmonary artery bands.
What happens during and after the surgery?
Before and during surgery
Before the surgery, the baby is in the intensive care unit (ICU). As mentioned earlier, they will continue to give medication to keep the special blood vessel open. It may also be necessary to enlarge the hole between the two upper chambers of the heart (a `septostomy`).
The Norwood procedure is a very complex, multi-hour procedure (usually 8-10 hours). The team of doctors carefully performs the following:
- A hole is made between the two upper chambers (atria) of the heart to allow blood to flow.
- The small aorta is connected to the large pulmonary artery, and a special patch is inserted to create a new, larger aorta.
- This new aorta is connected to the working right ventricle.
- Next, a 'shunt' , a small artificial tube, is inserted to send blood to the lungs. This can be from the aorta to the lungs (Blalock-Taussig shunt) or from the right ventricle to the lungs (Sano shunt).
Throughout this surgery, the baby is connected to a cardiopulmonary bypass machine . This means that the baby's heart and lungs are temporarily being operated by this machine.
After surgery
After the surgery, the baby is brought back to the intensive care unit (ICU). When you go to see the baby, you will see a lot of tubes, wires, and machines. Don't be scared when you see them. They are all there for the baby's well-being, to help the baby . You will see a bandage covering the surgical wound in the middle of the chest.
Even after this surgery, the baby's skin may have a slight blue tint (cyanosis) . This is because some deoxygenated blood and oxygenated blood are still mixing inside the heart. This is normal at this stage.
After about a week in the intensive care unit, the baby will be transferred to a regular ward. You will need to stay in the hospital for about 2-3 weeks to fully recover. After you go home, the doctors and nurses will give you detailed instructions on how to care for the baby, how to give him medication, and how to check his oxygen levels.
Series of surgeries for HLHS
HLHS doesn't stop with just one surgery. It's a three-stage series of surgeries . Norwood is just the first stage.
| Stage | Name of the surgery | Usually done at an age |
|---|---|---|
| First surgery | Norwood Procedure | Within 2 weeks of birth |
| Second surgery | Glenn Procedure | Between 4 - 8 months |
| Third surgery | Fontan Procedure | Between 1.5 - 5 years |
What are the benefits and risks?
Advantages
The biggest and only advantage of this is that the baby has a chance to survive . Before the 1980s, there was no treatment for babies born with HLHS. But since the Norwood procedure was invented, these babies have had a chance to survive into childhood and adolescence.
Risks and Complications
Like any major surgery, there are risks involved. It's important to be aware of these.
- Shunt blockage or dysfunction: The small tube that carries blood to the lungs can become blocked.
- Narrowing of blood vessels (Stenosis): The surgically removed aorta or the blood vessels leading to the lungs may become narrow.
- Heartbeat abnormalities (Arrhythmia): The rhythm of the heart beat may become irregular.
- Weakening of heart function: As the right ventricle has to bear more weight, its function may weaken.
- Neurodevelopmental delays: Some delays in the development of the brain and nervous system can occur. As a result, some babies may need special help with things like talking and walking.
The survival rate in the hospital after the Norwood procedure is as high as 90%. However, there are cases where some babies do not make it to the second surgery.
When should you see your doctor?
You should pay close attention to your baby after you get home. If you have any concerns, call your doctor right away. Be especially careful about the following:
- If you have any questions about taking care of your baby at home.
- If the baby is not gaining weight properly.
- If the baby's oxygen level is lower than what the doctor said to expect.
- If the baby does not respond well to the prescribed medication.
- If the baby is more sleepy than usual or has reduced milk intake.
Remember, this baby will need the supervision and care of a cardiologist for the rest of his life.
Take-Home Message
- Hypoplastic Left Heart Syndrome (HLHS) is a serious condition. However, the Norwood procedure is the first and most important step that can save the baby's life.
- This is not a complete cure. Two more surgeries (Glenn and Fontan) will be required after this.
- The surgery is complex and has risks, but the chance of survival is worth it.
- It is essential for the baby's well-being to follow the doctor's instructions exactly after going home and to attend clinics on the scheduled dates.
- As parents, it's normal to feel scared and anxious. Never be afraid to ask your doctor any questions or concerns you may have. You are not alone.
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