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. Most people who have episodes of tachycardia remain well even though they may need to keep taking medicine. Some patients will need periodic checkups, but most will be able to enjoy normal activity with no restrictions.