An External Defibrillator is a machine that is used to deliver an electrical shock to the heart to restore a normal heart rhythm. It can recognize a rhythm that requires a shock. It is used to treat life-threatening heart rhythms such as ventricular fibrillation or ventricular tachycardia. It can also be used for electric conversion of atrial fibrillation to normal sinus rhythm. An AED (automated external defibrillator) is a computerized medical device that is portable. It can advise the rescuer when a shock is needed using voice prompts, lights and text messages to tell the rescuer the steps to take. An AED makes life-saving defibrillation available in places where large numbers of people gather or people who are at high risk for heart attacks live.
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