Treatment with medications is often stopped after six to 12 months. Sometimes SVT can be detected while a baby is still in the womb. Then treatment may consist of having the mother take medications to slow the baby's heart rate. If SVT occurs in an older infant or child, the child may be aware of the rapid heart rate. This may be associated with palpitations, dizziness, lightheadedness, chest discomfort, upset stomach or weakness.
Some children can learn techniques that cause the heart rate to slow down.
This is called a Valsalva maneuver. Older children are more likely to have more episodes of tachycardia. That's why they're more likely to need prolonged treatment. They also may require more diagnostic tests. It's unusual for episodes of SVT to prevent a child from enjoying normal activities.