What condition may be treated using an artificial pacemaker?

What are pacemakers? 

Pacemakers are miniature lithium battery powered devices that take over control of the heartbeat. They are surgically implanted either under the skin or next to the heart and emit electrical impulses. Most commonly, pacemakers are used when the heart beats too slowly due to a disorder called heart block. Rapid heartbeat disorders called arrhythmias may also be treated with pacemakers, but are now more commonly treated through surgical removal of an abnormal electrical pathway in the heart. Many advances in the design of pacemakers and in the surgical control of abnormal heart rhythms have occurred in recent years, including successful miniaturization of pacemakers.

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