The LifeVest® wearable cardioverter defibrillator (WCD) is worn by patients at risk of sudden cardiac death (SCD). A defibrillator is a device that is used to control dangerously fast heart rhythms by applying an electrical shock to the heart. While some defibrillator devices are implanted under the skin, the LifeVest WCD is worn directly against the patient’s skin. With LifeVest, patients can have a constant safeguard against SCD.