Add Yahoo as a preferred source to see more of our stories on Google. Electrocardiograms, or ECGs, record the electrical activity of your heart. Randy Faris/The Image Bank via Getty Images Your ...

Your heart runs on electricity! Discover how tiny sparks keep it beating — and how Buffalo inventor Wilson Greatbatch’s “happy accident” led to the pacemaker, a life-saving device that changed ...

You must have heard of pacemakers? They are required when the heart's natural system malfunctions, causing it to beat too ...

An implant the size of a watch that zaps the heart with electric pulses could help thousands of people with heart failure – by cleverly changing the organ’s source of fuel. Healthy hearts mostly burn ...