If your child has a pacemaker, you may think you know how to keep your child safe. It might be true, but a refresher course doesn’t hurt. These life-saving devices are little miracle workers that keep your heart rhythm normal and regulate arrhythmias, tachycardia, and bradycardia. If you live with someone who has a pacemaker or if you are a caregiver, it’s important you know the issues in case they forget. Let’s take a little pacemaker quiz. Myth or fact: what you should know about pacemakers.