A doctor may prescribe an anti-arrhythmic drug such as a beta-blocker to someone at risk for ventricular fibrillation. An internal cardioverter defibrillator (ICD) may also be beneficial. An ICD is a battery-powered device that is implanted near the left collarbone. One or more flexible wires go through the veins to the heart. The ICD constantly monitors a person's heartbeat. If ventricular tachycardia or ventricular fibrillation occurs, the ICD sends shocks to the heart to reset its rhythm.

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