About hypoplastic left heart syndrome (hlhs)

What is hypoplastic left heart syndrome (hlhs)?

General Discussion

Hypoplastic left heart syndrome is a term used to describe a group of closely related rare heart defects that are present at birth (congenital). The normal heart has four chambers. The two upper chambers, known as atria, are separated from each other by a fibrous partition known as the atrial septum. The two lower chambers are known as ventricles and are separated from each other by the ventricular septum. Valves connect the atria (left and right) to their respective ventricles. The valves allow for blood to be pumped through the chambers. Blood travels from the right ventricle through the pulmonary artery to the lungs where it receives oxygen. The blood returns to the heart through pulmonary veins and enters the left ventricle. The left ventricle sends the now oxygen-filled blood into the main artery of the body (aorta). The aorta sends the blood throughout the body. Hypoplastic left heart syndrome is characterized by the underdevelopment (hypoplasia) of the chambers on the left side of the heart (i.e., left atrium and ventricle). In addition, the mitral valve, which connects these chambers to each other, is usually abnormally narrow (stenosis) or closed (atresia) and the aortic valve, which connects the heart to the major vessels that lead from the lungs (ascending aorta), may also be narrow or closed. Infants with hypoplastic left heart syndrome also have an abnormally narrow ascending aorta.

What are the treatments for hypoplastic left heart syndrome (hlhs)?

Hypoplastic left heart syndrome is treated through several surgical procedures or a heart transplant. Your child's doctor will discuss treatment options with you.

If the diagnosis has been made before the baby is born, doctors usually recommend delivery at a hospital with a cardiac surgery center.

Your baby's doctor might recommend several options to help manage your baby's condition before surgery or transplant, including:

  • Medication. The medication alprostadil (Prostin VR Pediatric) helps widen the blood vessels and keeps the ductus arteriosus open.
  • Breathing assistance. If your baby has trouble breathing, he or she may need help from a breathing machine (ventilator) to get enough oxygen.
  • Intravenous fluids. Your baby will receive fluids through a tube inserted into a vein.
  • Feeding tube. If your baby has trouble feeding or tires while feeding, he or she can be fed through a feeding tube.
  • Atrial septostomy. This procedure creates or enlarges the opening between the heart's upper chambers (atria) to allow more blood flow from the right atrium to the left atrium if the foramen ovale closes or is too small. If your baby already has an atrial septal defect, an atrial septostomy might not be necessary.

Surgeries and other procedures

Your child will likely need several surgical procedures to treat hypoplastic left heart syndrome. Surgeons perform these procedures to create separate pathways to get oxygen-rich blood to the body and oxygen-poor blood to the lungs. The procedures are done in three stages.

  • Norwood procedure. This surgery is usually done within the first two weeks of your child's life. There are several ways to do this procedure.

    Surgeons reconstruct the aorta and connect it to the heart's lower right chamber (right ventricle). Surgeons insert a tube (shunt) that connects the aorta to the arteries leading to the lungs (pulmonary arteries), or they place a shunt that connects the right ventricle to the pulmonary arteries. This method allows the right ventricle to pump blood to both the lungs and the body.

    In some cases, a hybrid procedure is done. Surgeons implant a stent in the ductus arteriosus to maintain the opening between the pulmonary artery and aorta. Bands placed around the pulmonary arteries reduce blood flow to the lungs and create an opening between the atria of the heart.

    After the Norwood procedure, your baby's skin will still have a blue coloring because oxygen-rich and oxygen-poor blood continue to mix within the heart. Once your baby successfully passes through this stage of treatment, the odds of survival can increase.

  • Bidirectional Glenn procedure. This procedure is generally the second surgery. It's done when your child is between 3 and 6 months of age. Doctors remove the first shunt attached to the pulmonary arteries, and then connect one of the large veins that normally returns blood to the heart (the superior vena cava) to the pulmonary artery instead. If surgeons previously performed a hybrid procedure, they'll follow additional steps during this procedure.

    This procedure reduces the work of the right ventricle by allowing it to pump blood mainly to the aorta. It also allows most of the oxygen-poor blood returning from the body to flow directly into the lungs without a pump.

    After this procedure, all the blood returning from the upper body is sent to the lungs, so blood with more oxygen is pumped to the aorta to supply organs and tissues throughout the body.

  • Fontan procedure. This surgery is usually done when your child is between 18 months and 4 years of age. The surgeon creates a path for the oxygen-poor blood in one of the blood vessels that returns blood to the heart (the inferior vena cava) to flow directly into the pulmonary arteries. The pulmonary arteries then transport the blood into the lungs.

    The Fontan procedure allows the rest of the oxygen-poor blood returning from the body to flow to the lungs. After this procedure, there's minimal mixing of oxygen-rich and oxygen-poor blood in the heart, and your child's skin will no longer look blue.

  • Heart transplant. Another surgical option is a heart transplant. However, the availability of a heart to be used for transplant is limited, so this option is not used as often. After a heart transplant, your child will need medications throughout life to prevent rejection of the donor heart.

Follow-up care

After surgery or a transplant, your baby will need lifelong follow-up care with a cardiologist trained in congenital heart diseases. Some medications might be needed to regulate heart function. Various complications can occur over time and might require further treatment or other medications.

Your child's cardiologist will tell you whether your child needs to take preventive antibiotics before certain dental or other procedures to prevent infections. In some cases, the doctor might also recommend that your child limit physical activity.

Follow-up care for adults

As an adult, you'll transition from a pediatric cardiologist to a cardiologist trained in congenital heart disease in adults. Only recently have advances in surgical care resulted in children with hypoplastic left heart syndrome surviving into adulthood, so it's not yet clear the challenges an adult with the condition might face. You'll need regular, lifelong follow-up care to monitor for any changes in your condition.

Women considering pregnancy should discuss pregnancy risks and birth control options with their doctors. Having this condition increases your risk of cardiovascular problems during pregnancy, the risk of miscarriage and the risk of having a baby with congenital heart disease.

Is there a cure/medications for hypoplastic left heart syndrome (hlhs)?

Hypoplastic Left Heart Syndrome is a congenital heart defect which means the defect that comes with the birth of a baby. It is usually diagnosed at the time of a woman’s pregnancy and the ultrasound or after the birth of a baby. So, right after diagnosis, doctors should start taking precautions with the pregnant patient and continue the treatments after the birth of a baby.

Cure/Treatment/Medications for HLHS:

There are treatments that can be started soon after the baby is born to avoid risks and botheration for the baby. It is required to keep the baby on machine support and starts procedures to treat the ailment immediately as follows:

  • Stabilization: It started pre-birth, but it has to be continued post-birth of a baby for stabling the right side of the heart and working properly.
  • Medications: There are medicines available but only to enhance the working of the right side of the heart & broaden the passage for blood to reach the whole body.
  • Nutrition: Due to a lack of energy in the infant’s body because of the improper left side of the heart, a baby can’t feed completely. So it is essential to give the baby some prescribed formula through a feeding tube.
  • Surgeries: Once the baby stabilizes after birth, it is important for doctors to begin with all the necessary surgeries in sequential order from Norwood Procedure, Bi-Directional Glenn Shunt Procedure, and Fontan Procedure.
Blue-coloration of skin,Difficulty in Breathing,Sleepiness,Faint Murmur (extra sound with sound of heart beat)
Uneven Heart Structure, Defected Left Heart Ventricle, Heart Valves not formed, Hole between left and right chambers of heart.
Prostaglandin E1 infusion, diuretics, inotropes, and afterload reduction.

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