Arrhythmias in Children
An arrhythmia is an abnormal rhythm of the heart. In an arrhythmia, abnormal electrical
signals through the heart muscle may cause the heart to beat too fast (tachycardia),
too slow (bradycardia), or irregularly. When the heart doesn't beat normally, it isn't
able to pump blood to the body as well. That means the brain, lungs, and other organs
may not get enough blood. And the organs can't work as well and may become damaged.
Arrhythmias in children include:
Long-Q-T syndrome (LQTS). This is a
condition passed from parents to children (inherited). It usually affects children
and young adults. Many children have no symptoms, but fainting is common in those
do. It may also cause cardiac arrest
Premature atrial contraction (PAC) and
premature ventricular contraction (PVC).
PACs or PVCs are abnormal beats that
start in the upper chambers of the heart
(atria) or the lower chambers of the heart (ventricles). They are common in
children and teens. Often, they are considered completely normal and harmless.
Sinus tachycardia. A fast heart rate that occurs with fever, excitement, and exercise. It is normal.
Supraventricular tachycardia (SVT),
paroxysmal atrial tachycardia (PAT), or paroxysmal supraventricular tachycardia
This is the most common tachycardia in children. An abnormal electric
circuit or focal site in the atria can cause rapid heart rates. Treatment may be
needed if it happens often or lasts long.
Wolff-Parkinson-White (WPW) syndrome.
This is an abnormal electrical signal that gets to the ventricle over an extra
electrical pathway. It's present since birth. A fast heart rate is a common symptom.
Or a child may not have symptoms. Sudden cardiac death may rarely occur.
Ventricular tachycardia (VT). This is
a potentially life-threatening arrhythmia. It may be from serious heart disease. It
is caused by a very fast electrical signal from the ventricles. A child may feel
weak, tired, dizzy, or may faint (syncope). He or she may also feel his or her heart
Sick sinus syndrome. The heart's
natural pacemaker (sinus node) doesn't work as it should. This causes slow heart
rates. . It may occur in children who have had open heart surgery. A child may not
have symptoms. A child with symptoms may be tired or dizzy, or may faint.
Complete heart block. The electrical signal from the upper to lower chambers is blocked. The heart usually
beats considerably more slowly. This problem may happen after heart surgery or be
caused by heart disease. It may cause a child to faint.
The cause of an arrhythmia may be unknown. Some known causes in children include:
- Heart problem that is present at birth (congenital)
- Heart problem that is inherited
- Abnormal levels of certain chemicals in the blood
- Normal reaction to exercise, fever, or emotions
- Changes in the structure of the heart
- Electrical conduction abnormality
A child with an arrhythmia may not have any symptoms. For those who do, these are
the most common symptoms:
- Feeling weak
- Feeling tired
- Feeling like the heart is fluttering (heart palpitations)
- Low blood pressure
- Feeling dizzy
- Fainting (syncope)
- Not feeding or eating well
The symptoms of an arrhythmia may look like other health conditions or heart problems.
Make sure your child sees his or her healthcare provider for a diagnosis.
Your child's healthcare provider will ask about your child's health history and family
history. He or she look for signs and symptoms of an arrhythmia. The provider will
give your child an exam focusing on the heart. Your child may need to see a pediatric
cardiologist. This is a doctor with special training to treat children with heart
problems. Your child may need tests, including:
Electrocardiogram (ECG). This simple
test measures the electrical activity of the heart. An ECG may show an arrhythmia.
The test may be a:
Resting ECG. Your child will
lie down while electrodes are connected to the ECG machine by wires. The ECG
records the heart's electrical activity for a minute or so.
Stress test (exercise ECG).
Your child is attached to the ECG machine as described above. He or she
will walk on a treadmill or pedal a stationary bike while the ECG is recorded.
This test is done to check the heart during exercise.
Holter monitoring. Your child will
have his or her heart rhythm checked over 24 to 48 hours. A small portable monitor
worn while your child goes about his or her usual activities.
Electrophysiologic study (EPS). For
this test, the doctor puts a small, thin tube (catheter) into a large blood vessel
an leg or arm. The doctor moves the catheter to your child's heart. This test can
find out the type electrical signal causing the problem, and where the signal
Tilt table test. This test may be
done if your child faints often. The test checks your child's heart rate and blood
pressure as he or she changes position.
Echocardiography (echo). This test
uses sound waves to make detailed pictures of your child's heart structure and
- Implanted loop recorder. This heart monitoring device may be
used when the doctor thinks your child is at high risk for arrhythmia and other
testing has not given a straight-forward result. This test may only be used in
children who are high risk. The device is put under the skin. Itis used for long-term
Treatment will depend on your child’s symptoms, age, and general health. It will also
depend on how severe the condition is. Some children don't need treatment. If your
child needs treatment, he or she will likely be cared for by a pediatric cardiologist.
Treatment may include:
Medicines. Medicines can ease
Radiofrequency ablation. This
procedure uses a special catheter to destroy the tissue causing the abnormal
Surgery. Surgery can stop an abnormal
Pacemaker. An artificial pacemaker
may be needed with some arrhythmias. The pacemaker is a small device that is put
inside the abdomen or chest. It gives a small amount of electricity to the heart to
keep it beating regularly. Your child may need this if he or she has a slow heart
Implantable cardioverter defibrillator
This a device is put in the chest or abdomen. It automatically sends a
shock to stop an abnormal and dangerous rhythm. Some ICDs also work as
An electric shock is given. This briefly stops the abnormal
electrical action in the heart. It "resets" the heart's normal pacemaker. The heart
can then restart in a normal rhythm.
Complications can happen, depending on the type of arrhythmia and how serious it is.
Complications may include:
- Damage to the brain, kidneys, lungs, liver, or other organs
- Heart failure
- Blood clots. A blood clot in the brain may cause a stroke.
- Sudden cardiac death
Some arrhythmias don't cause any
problems. Some are more serious. A child with a serious arrhythmia will need frequent
Talk with your child's healthcare provider about managing your child's arrhythmia.
Your child may need regular tests. Or your child may not be able to take part in some
sports or activities.
When to Call a Healthcare Provider
Call your child's healthcare provider if your child has symptoms of an arrhythmia.
- Feeling weak or tired
- Having heart palpitations
- Feeling dizzy
- Fainting (syncope)
- Not feeding or eating well
- An arrhythmia is an abnormal heart rhythm. It may be a heart rate that is too fast,
too slow, or irregular.
- An arrhythmia may not cause any symptoms. Or an arrhythmia may cause moderate to very
- An arrhythmia may not need treatment.
If treatment is given, your child may need medicine, radiofrequency ablation, a
device, or surgery.
Tips to help you get the most from a visit to your child’s healthcare provider:
- Know the reason for the visit and what you want to happen.
- Before your visit, write down questions you want answered.
- At the visit, write down the name of a new diagnosis, and any new medicines, treatments,
or tests. Also write down any new instructions your provider gives you for your child.
- Know why a new medicine or treatment is prescribed and how it will help your child.
Also know what the side effects are.
- Ask if your child’s condition can be treated in other ways.
- Know why a test or procedure is recommended and what the results could mean.
- Know what to expect if your child does not take the medicine or have the test or procedure.
- If your child has a follow-up appointment, write down the date, time, and purpose
for that visit.
- Know how you can contact your child’s provider after office hours. This is important
if your child becomes ill and you have questions or need advice.