Before you begin reading about aortic stenosis in children, please read the explanation of how the normal heart works for a basic understanding of its structure and function.
When the heart squeezes, the left ventricle (the lower left chamber) contracts, pushing blood into the aorta, the main artery that takes blood to the body. The aortic valve is located between the left ventricle and the aorta and prevents blood from leaking back into the heart between beats. A normal aortic valve is made up of three thin leaflets.
In aortic stenosis, or obstruction at the aortic valve, the leaflets are fused or are too thick. As a result, the valve is too narrow and causes obstruction to blood flow out of the heart. The heart has to work harder to pump enough blood to the body. Aortic stenosis can be trivial, mild, moderate, severe or critical.
Sometimes the stenosis is below the valve in the left ventricle, caused by a fibrous membrane or a muscular ridge. This is called subaortic stenosis. Also, the stenosis can occur above the valve, in the aorta itself; this is called supravalvar aortic stenosis.
In young infants, severe or critical aortic stenosis can cause decreased blood flow, which manifests as lethargy, poor feeding, respiratory distress. Milder forms of aortic stenosis usually won’t cause symptoms in infants or small children. As the child gets older, signs and symptoms or aortic stenosis may appear, including fatigue, a heart murmur (an extra heart sound when a doctor listens with a stethoscope), or, rarely, chest pain, fainting or arrhythmias (abnormal heart rhythm).
In rare cases, newborns have critical aortic stenosis, which requires immediate medical attention. Sometimes these severe cases are diagnosed before birth, through our Fetal Heart Program.
In most cases, we diagnose aortic stenosis after a primary care doctor detects a heart murmur and refers a child to us.
Diagnosis may require some or all of these tests:
Aortic stenosis can run in families, so be sure to tell your cardiologist if there is a history of a heart murmur in other close family members.
The exact treatment required for aortic stenosis depends on each child's heart anatomy. Trivial and mild aortic stenosis typically require no treatment. However, moderate, severe and critical aortic stenosis require treatment.
In most cases, the condition is treated with balloon valvuloplasty, which requires cardiac catheterization. Doctors advance a thin tube (catheter) to the heart through a vein in the leg, or through the umbilical cord in newborns. The catheter has a balloon on the end of it. To open up the narrow valve, the balloon is briefly inflated, deflated and withdrawn. Sometimes, two catheters and balloons are used.
Older children will spend one night in the hospital after this procedure and will need to rest for the next few day, but then can resume normal activity. Newborns with critical aortic stenosis will stay in our Tabas Cardiac Intensive Care Unit (CICU) before and after the procedure, and will require some time to recover.
Surgery to repair or to replace the valve is often necessary in severe cases. Depending on the age, gender and particular needs of your child, as well as the valve anatomy, surgeons may attempt to repair the valve, or at least improve its function, with a surgery called a valvuloplasty.
Another option to treat aortic stenosis includes the use of mechanical (artificial) valves as replacement valves. If this is the case, your child may need to stay on blood-thinning medicines for the rest of his or her life.
Yet another option to treat aortic stenosis is the Ross Procedure. In this operation, the aortic valve is replaced with the patient's pulmonary valve. The pulmonary valve is then replaced with one from a donated organ. This procedure allows the patient's own pulmonary valve (now in the aortic position) to grow with the child.
Subaortic and supravalvar stenosis do not get better with balloon dilation, and will require surgery if the amount of obstruction is moderate or severe, or, with subaortic stenosis, if the aortic valve begins to leak significantly. Surgery for subaortic stenosis involves cutting out the ridge. Surgery for supravalvar aortic stenosis involves enlarging the aorta with a patch.
Children with aortic stenosis require regular checkups with a pediatric cardiologist. Some children must remain on medicine and limit physical activity.
As the child with aortic stenosis grows, blood may begin to leak through the abnormal valve. This is called aortic regurgitation or aortic insufficiency. In other children, the stenosis can reoccur. When this happens, balloon valvuloplasty can be repeated, as long as there isn't significant aortic regurgitation. In severe cases, additional surgery may be necessary.
Our pediatric cardiologists follow patients until they are young adults, coordinating care with the primary care physicians.
Adults with aortic stenosis must continue to see a cardiologist regularly. The Cardiac Center will help with the transition to an adult cardiologist. All patients with aortic valve disease need some form of lifelong follow-up with a cardiologist.
The Philadelphia Adult Congenital Heart Center, a joint program of The Children's Hospital of Philadelphia and the University of Pennsylvania, meets the unique needs of adults who were born with heart defects.
Because of enormous strides in medicine and technology, today most children with heart conditions go on to lead healthy, productive lives as adults.
Contact the Cardiac Center at The Children's Hospital of Philadelphia for a second opinion or for more information.
Reviewed by: Shobha S. Natarajan, MD
Date: November 2013
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