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Most children do not have any symptoms of long QT syndrome. You may only become aware of your child’s condition because of a doctor’s visit or medical test, genetic testing results, or if you have a family history of the syndrome.
Symptoms of long QT syndrome usually happen when a child is startled, and the most common symptoms include seizures and fainting.
Symptoms can also happen while your child sleeps, or if they are woken up suddenly. Although not common, sometimes the heart can beat so fast or unpredictably that it can cause sudden death.
Your child’s doctor will ask you for a review of any symptoms your child may have, including how long they have had them and how severe they are. Your child’s doctor will also conduct a physical exam. If your doctor thinks your child may have long QT syndrome, they will order more tests to help confirm the diagnosis.
These other tests may include:
Although not common, sometimes an EKG does not show the long QT interval, and makes it hard to confirm the diagnosis. If this is the case, your doctor may order other tests, such as:
You may want to seek a second opinion if your child is diagnosed with long QT syndrome.
Treatment for long QT syndrome will depend on your child’s symptoms.
The goal of long QT syndrome treatment is to prevent sudden death by keeping the heart from beating too fast or out of control. Your child’s doctor may also treat heart rhythm disorders as needed.
Treatment may include one or more of the following:
Talk to your child’s doctor to figure out the best treatment plan for your child. If your child has long QT syndrome:
Because your child may develop long QT syndrome before birth, there may be nothing you can do to prevent it.
Keep salt and mineral levels within a healthy range to help prevent this syndrome from developing.
If your child has long QT syndrome, follow the doctor’s plan to help prevent problems, and make sure to have a plan in case a cardiac event does happen.
Long QT syndrome is a rare heart disorder that can sometimes cause rapid, uncontrollable heartbeats. This heartbeat pattern can cause your child to all of a sudden faint or have a seizure.
The term “long QT” is in reference to the activity in the heart’s lower chambers as measured with an electrocardiogram [ee-lek-troh-CAR-dee-oh-gram] (EKG or ECG). This measurement is called the QT interval. Most of the time, the QT interval takes about one-third of each heartbeat cycle. In children that have long QT syndrome, this part of the heartbeat lasts longer than normal. It causes rapid or abnormal heartbeats by throwing off the rest of the heartbeat cycle. Children with this disorder may not have symptoms for a while. Although there is no cure, there are treatments that can help reduce or prevent symptoms.