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Overview


Pacemakers are battery-powered implantable devices that electrically stimulate the heart to contract and thus to pump blood throughout the body. Pacemakers consist of a pager-sized housing device that contains a battery, 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 when the heart's own "spark plug" or electrical system no longer functions normally....Read the full article