Hypoplastic left heart syndrome

Alternative Names

Treatment

Once the diagnosis of hypoplastic left heart is made, the baby will be admitted to the neonatal intensive care unit. A breathing machine (ventilator) may be needed to help the baby breathe. A medicine called prostaglandin E1 is used to maintain circulation of blood to the body.

These measures do not solve the problem. The condition always requires surgery.

The first surgery, called the Norwood operation, occurs within the first few days of life. Stage I of the Norwood procedure consists of building a new aorta, and an artificial shunt is inserted to maintain blood flow to the lungs.

Afterwards, the baby usually goes home. The child will need to take one or more daily medicines and be closely followed by a pediatric cardiologist, who will determine when the second stage of surgery should be done.

Stage II of the operation is called the Glenn shunt or Hemifontan procedure. This procedure connects half of the veins carrying blue blood from the body (the superior vena cava) directly to blood vessels to the lungs to get oxygen. The surgery is usually done when the child is 4 - 6 months of age.

During stage I and II, the child may still appear somewhat blue (cyanotic).

Stage III, the final step, is called the Fontan procedure. The remainder of the veins carrying blue blood from the body (the inferior vena cava) is connected directly to the blood vessels to the lungs, and the right ventricle now serves as the only pumping chamber for the heart. This surgery is usually performed between the ages of 18 months and 3 years of age. After this final step, the baby is no longer blue (cyanotic).

Some patients may need more surgeries in their 20s or 30s if they develop hard to control arrhythmias or other complications of the Fontan procedure.

In some hospitals, heart transplantation is considered a better choice than the 3-step surgery process. However, there are few donated hearts available for small infants.

Outlook (Prognosis)

If left untreated, hypoplastic left heart syndrome is fatal. Survival rates for the staged repair continue to rise as surgical technique and postoperative management improve. Survival after the first stage is more than 75%.

It is important to note that the size and function of the right ventricle are important determinants of outcome after surgery.

Possible Complications

Complications include:

• Irregular, fast heart rhythms (arrhythmias)
• Chronic diarrhea (from a disease called protein loosing enteropathy)
• Heart failure
• Fluid in the abdomen (ascites) and in the lungs (pleural effusion)
• Blockage of the artificial shunt
• Strokes and other neurological complications
• Sudden death

When to Contact a Medical Professional

If your infant has new changes in breathing patterns, eats less (decreased feeing), or has skin or mucous membranes that are turning blue (cyanotic), contact your health care provider immediately.

References

Zipes DP, Libby P, Bonow RO, Braunwald E, eds. Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine, 8th ed. St. Louis, Mo; WB Saunders; 2007.