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 ...
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How a defibrillator differs from a pacemaker
I've seen emergency defibrillators in public places, but I've also heard that some people need to wear them or have them implanted for heart rhythm problems. Can you explain the differences?
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