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OverviewOverview
Pacemakers are battery-powered implantable devices that function to electrically stimulate the heart to contract and thus to pump blood throughout the body. Pacemakers consist of a pager-sized housing device which contains a battery and the electronic circuitry that runs the pacemaker and one or two long thin wires that travel through a vein in the chest to the heart. Pacemakers are usually implanted in patients in whom the heart's own "spark plug" or electrical system is no longer...Read the full article
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