If you've had ventricular arrythmias, you may have a small electrical device called an implantable cardioverter defibrillator (ICD) surgically implanted in your chest. Mild arrhythmias can usually be controlled with medicine such as beta blockers. However, survival rates have improved significantly since the invention of the portable defibrillator – an external device that delivers an electric shock to the heart and "resets" it to the right rhythm. These life-threatening types of arrhythmia can be a major cause of death during the 24 to 48 hours after a heart attack.
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