Diagnosis

Although it's possible your baby's transposition of the great arteries may be diagnosed before birth, it can be difficult to diagnose. Prenatal tests for transposition of the great arteries aren't usually done unless your doctor suspects your baby may have congenital heart disease.

After your baby is born, his or her doctor will immediately suspect a heart defect such as transposition of the great arteries if your baby has blue-tinged skin (cyanosis) or if your baby is having trouble breathing.

Sometimes, the bluish skin color isn't as noticeable if your baby has another heart defect, such as a hole in the wall separating the left and right chambers of the heart (septum), that's allowing some oxygen-rich blood to travel through the body. If the hole is in the upper chambers of the heart, it's called an atrial septal defect. In the lower chambers of the heart, the defect is called a ventricular septal defect.

It's also possible your baby could have a patent ductus arteriosus — an opening between the heart's two major blood vessels, the aorta and the pulmonary artery — that allows oxygen-rich and oxygen-poor blood to mix.

As your baby becomes more active, the heart defects won't allow enough blood through and eventually the cyanosis will become obvious.

Your baby's doctor may also suspect a heart defect if he or she hears a heart murmur — an abnormal whooshing sound caused by turbulent blood flow.

A physical exam alone isn't enough to accurately diagnose transposition of the great arteries. One or more of the following tests are necessary for an accurate diagnosis:

  • Echocardiogram. An echocardiogram is an ultrasound of the heart — it uses sound waves that bounce off your baby's heart and produce moving images that can be viewed on a video screen. Doctors use this test to diagnose transposition of the great arteries by looking at the position of the aorta and the pulmonary artery.

    Echocardiograms can also identify associated heart defects, such as a ventricular septal defect, atrial septal defect or patent ductus arteriosus.

  • Cardiac catheterization. This procedure is typically done only when other tests, such as an echocardiogram, don't show enough information to make a diagnosis.

    During a cardiac catheterization, the doctor inserts a thin flexible tube (catheter) into an artery or vein in your baby's groin and directs it up to his or her heart. A dye is injected through the catheter to make your baby's heart structures visible on X-ray pictures. The catheter also measures pressure in the chambers of your baby's heart and in the blood vessels and can measure the amount of oxygen in the blood.

    Cardiac catheterization may be done urgently to perform a temporary treatment for transposition of the great arteries (balloon atrial septostomy).

  • Chest X-ray. Although a chest X-ray doesn't provide a definitive diagnosis of transposition of the great arteries, it does allow the doctor to see your baby's heart size and the position of the aorta and pulmonary artery.
  • Electrocardiogram. An electrocardiogram records the electrical activity in the heart each time it contracts. During this procedure, patches with wires (electrodes) are placed on your baby's chest, wrists and ankles. The electrodes measure electrical activity, which is recorded on paper.

Treatment

All infants with transposition of the great arteries need surgery to correct the defect.

Before surgery

Your baby's doctor may recommend several options to help manage the condition before corrective surgery. They include:

  • Medication. The medication prostaglandin E1 (alprostadil) helps keep the connection between the aorta and pulmonary artery open (ductus arteriosus), increasing blood flow and improving mixing of oxygen-poor and oxygen-rich blood until surgery can be performed.
  • Atrial septostomy. This procedure — usually done using cardiac catheterization rather than surgery — enlarges a natural connection between the heart's upper chambers (atria). It allows for the oxygen-rich and oxygen-poor blood to mix and results in improved oxygen delivery to your baby's body.

Surgery

Surgical options include:

  • Arterial switch operation. This is the most common surgery used to correct transposition of the great arteries. Surgeons usually perform this surgery within the first week of life.

    During an arterial switch operation, the pulmonary artery and the aorta are moved to their normal positions: The pulmonary artery is connected to the right ventricle, and the aorta is connected to the left ventricle. The coronary arteries also are reattached to the aorta.

    If your baby has a ventricular septal defect or an atrial septal defect, those holes usually are closed during surgery. In some cases, however, the doctor may leave small ventricular septal defects to close on their own.

  • Atrial switch operation. In this surgery, the surgeon makes a tunnel (baffle) between the heart's two upper chambers (atria). This diverts the oxygen-poor blood to the left ventricle and the pulmonary artery and the oxygen-rich blood to the right ventricle and the aorta.

    With this procedure, the right ventricle must pump blood to the body, instead of just to the lungs as it would do in a normal heart. Possible complications of the atrial switch operation include irregular heartbeats, baffle obstructions or leaks, and heart failure due to long-term problems with right ventricle function.

After surgery

After corrective surgery, your baby will need lifelong follow-up care with a heart doctor (cardiologist) who specializes in congenital heart disease to monitor his or her heart health. The cardiologist may recommend that your child avoid certain activities, such as weightlifting, because they raise blood pressure and may stress the heart.

Talk to your child's doctor about what type of physical activities your child can do, and how much and how often.

Many people who undergo the arterial switch operation don't need additional surgery. However, some complications, such as arrhythmias, heart valve leaks or problems with the heart's pumping, may require additional treatment.

Pregnancy

If you had transposition of the great arteries repaired in your infancy, it's possible for you to have a healthy pregnancy, but specialized care may be necessary. If you're thinking about becoming pregnant, talk to your cardiologist and obstetrician before conceiving.

If you have complications, such as arrhythmias or serious heart muscle problems, pregnancy may pose risks to both you and your fetus. In some situations, such as for women who have severe complications of their heart defect, pregnancy isn't recommended even for those with a repaired transposition.

Coping and support

Caring for a baby with a serious heart problem, such as transposition of the great arteries, can be challenging and frightening. Here are some strategies that may help make it easier:

  • Seek support. Ask for help from family members and friends. Talk with your child's cardiologist about support groups and other types of assistance that are available near you.
  • Record your baby's health history. You may want to write down your baby's diagnosis, medications, surgery and other procedures and the dates they were performed, your child's cardiologist's name and phone number, and any other important information about your baby's care. This record will help you recall the care your child has received, and it will be helpful for doctors who are unfamiliar with your baby to understand his or her health history.
  • Talk about your concerns. You may worry about the risks of vigorous activity, even after your child has had corrective surgery. Talk with the cardiologist about which activities are safe for your child. If some are off-limits, encourage your child in other pursuits rather than focusing on what he or she can't do.

    If you have other concerns about your child's health, discuss them with your child's cardiologist, too.

Although every circumstance is different, remember that due to advances in surgical treatment, most babies with transposition of the great arteries grow up to lead active lives.

Preparing for your appointment

Your child's doctor may suspect a congenital heart defect if your child has bluish skin from birth. You'll then be referred to a pediatric heart specialist (cardiologist) for diagnosis and treatment.

Transposition of the great arteries is usually diagnosed in the hospital shortly after birth, leading to urgent consultation with pediatric cardiologists and cardiac surgeons. Emergency procedures are often needed to improve your baby's oxygen level.

You won't likely have time to prepare for your first meeting with your baby's doctor because it will happen soon after birth, but for future visits the following information may be helpful.

What you can do

  • Get a complete family history for both sides of your baby's family. Find out if anyone in your child's family was ever born with a heart defect.
  • Ask a family member or friend to be with you, if possible. Sometimes it can be difficult to remember all of the information provided to you, and because you're so concerned about your baby, you may miss something the doctor says or you may forget some details.
  • Write down questions to ask your doctor.

For transposition of the great arteries, some basic questions to ask your doctor include:

  • What caused this to happen to my baby?
  • What treatments are available, and which do you recommend?
  • What happens if my baby doesn't have the surgery?
  • After surgery, will my baby have any lingering problems?
  • Will my child have any activity restrictions?
  • Are there any brochures or other printed material that I can take home with me? What websites do you recommend?

In addition to the questions that you've prepared to ask your doctor, don't hesitate to ask questions during your appointment anytime you don't understand something.

What to expect from your doctor

Your doctor is likely to ask you a number of questions, such as:

  • Is there a family history of heart disease at birth?
  • Did you experience any significant illnesses or take medications while pregnant?
  • Have you noticed that your baby has bluish skin, difficulty feeding or difficulty breathing?

Transposition of the great arteries care at Mayo Clinic

Oct. 28, 2017
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