Arrhythmia is an irregular heart rhythm. The condition is usually not serious, but when it is, treatment is generally effective. Share on Pinterest Jasmin Merdan/Getty Images It’s common for children ...

A cardiac arrhythmia refers to any abnormality in the heart's rate or rhythm. There are many different types of arrhythmias, some much more serious than others. A minor arrhythmia may cause you to ...