Defibrillators are devices that use a large jolt of energy to reset the heart during episodes of sudden cardiac arrest. External defibrillators use paddles to shock the heart rhythm through the chest, but there are also implantable defibrillators which operate constantly, beat by beat of the heart, to defibrillate the heart instantly if it is required. Here is how and why defibrillators do what they do.

What Everybody With a Heart Needs to Know About Defibrillators

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