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Pacemaker

Definition:

A small battery-operated electronic device that is surgically implanted under the skin and joined to the heart by wires, and that measures the pulse and corrects too fast or too slow heart rhythms.

Source: GreenFacts

More:

An ICD [implantable cardiac defibrillator] is a pacemaker-like device implanted under the skin. Wires called "leads" are placed in the heart to monitor the heart rate. When the device detects a potentially deadly heart rhythm disorder (arrhythmia), the ICD delivers a controlled, electric shock to restore the heart's normal rhythm.

Pacemaker

Source: Heart Rhythm Society Heart Attack 

Related words:

Arrhythmia - Circulatory system - Ventricular fibrillation

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