Sometimes problems with the heart’s electrical signals lead to a fast heart rhythm. Too many signals may make the heart beat very fast (tachycardia). Or signals may be sent so rapidly and irregularly that the heart muscle sometimes quivers and doesn’t beat at all (fibrillation).

Electrical system problems of the heart may make the atria beat faster than normal. If the atria beat quickly, but still evenly, it is called atrial flutter. If the atria beat very quickly and unevenly, it is called atrial fibrillation.

An ICD is a device that is placed permanently inside your body. An ICD monitors your heart rhythm (the speed and pattern of your heartbeat). If this rhythm becomes too fasst or too slow, the ICD sends out electrical signals that help bring the rhythm back to normal.

ICDs are well protected. Most machines and devices will not interfere. Microwave ovens and other appliances should not cause problems. Neither should computers. Signals from a few devices might cause problems with your ICD, though. Take care to avoid these potential problems.

A pacemaker is a small electronic device that helps your heart’s electrical system beat at the right pace. Inserting the pacemaker into your body is called implantation. You stay awake during the procedure.

You can usually do almost everything you did before you got your pacemaker. See your doctor regularly to help ensure that you remain healthy and feeling good. Here are some things to avoid.

An EPS closely monitors your heart rhythm. EPS can help determine exactly what your rhythm problem is and what can be done to control it. A specially trained doctor (electrophysiologist) performs the procedure in an EPS lab.