+A [defibrillator](/wiki/Defibrillator) is a crucial medical device that delivers a precisely controlled [electric shock](/wiki/Electric_shock) to the [heart](/wiki/Heart). Its purpose is to interrupt abnormal electrical activity, restoring a normal rhythm in cases of sudden cardiac arrest. This swift intervention is often vital for survival.
+## See also
+- [Cardiac arrest](/wiki/Cardiac_arrest)
+- [CPR](/wiki/CPR)
+- [First aid](/wiki/First_aid)
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