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Anaphylaxis is the most severe type of allergic reaction. It may happen from a few minutes to an hour or 2 after contact with an allergen. Anaphylaxis can cause the airways to swell, making it hard to breathe.

A detailed look at nasal allergies, and what to do when they affect your child.

An arrhythmia can cause your child's heart to pump blood less efficiently. Many arrhythmias are harmless and don't need to be treated. But if it causes symptoms, it may need treatment.

Catheter ablation is a way to treat a tachycardia. This is an abnormal heart rhythm (arrhythmia) in which the heart beats too fast.

The heart makes sounds as the heart valves open and close to allow blood to flow through the heart. When blood does not flow smoothly through the heart or heart valves, it causes the noise. This is called turbulence. Heart murmurs can be harmless (innocent) or caused by a heart problem (pathologic).

Follow these step-by-step instructions.

Follow the step-by-step instructions for this wrist exercise.

This exercise helps build strength in your wrist.

This exercise builds strength in your wrist.