Your child is having a heart test that uses a device called a Holter monitor. The monitor does an ECG (EKG) to record the electrical activity of the heart (timing of the heartbeat). This happens over 24 hours or more. The test helps the cardiologist (heart doctor) find out if your child has an arrhythmia (an irregular heartbeat). Your child should not feel any discomfort from the device.

The Holter monitor's leads (tiny wires), stickers, and electrodes will be placed on your child's chest. This can be done at a hospital, in your cardiologist's office, or at home. A skin prep lotion called Nuprep® is used to make sure that the electrodes have good contact with the skin.

If an abnormal heart beat is found, it might need treatment.

• Read the instructions that came with the monitor to see how to place the leads at home or put them back on if they come off.
• Make sure your child wears the monitor as directed. It can be worn over the shoulder in a pouch, in a cradle necklace around the neck, or carried in a pocket. Sometimes doctors use an e-patch Holter monitor. This wireless monitor attaches to the skin.
• Your child should continue with regular activities unless your cardiologist tells you otherwise.
• To keep the monitor dry, make sure your child avoids swimming, bathing, or showering. 
• In the diary you were given, write down any symptoms that your child has — like chest pain, skipped heartbeat, or dizziness. Add the date, time, and what your child was doing when the symptoms happened. 

Your child:

• has discomfort or irritation from the device
• feels lightheaded or dizzy
• has vomiting for more than 24 hours 

Your child:

• is having increased chest discomfort or shortness of breath
• faints but recovers right away

If your child is having severe chest pain or is unconscious and can't be awakened, call 911.

What happens after the monitoring is completed? Your child's cardiologist will review the heart rhythm on the monitor and follow up with you to discuss the results. The cardiologist may recommend more testing or begin treatment, depending on the results. Return the monitor through the mail using the prepaid and preaddressed envelope provided.