ABC - DEF - GHI - JKL - MNO - PQRS - TUV - WXYZ 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:
Source & ©: Heart Rhythm Society Heart
Attack 
Related words: Arrhythmia - Cardiovascular - Circulatory system - Ventricular fibrillation
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