• A subcutaneous implantable cardioverter-defibrillator (ICD) is a small, battery-powered device. It fixes serious changes in your heartbeat. ICDs are used in people who've had a life-threatening heart rhythm or are at high risk of having one.
  • The ICD is placed under the skin of the chest and it is attached to a wire (called a lead). The lead is placed under the skin so that it lies near your heart.
  • ┬áIf it detects a life-threatening heart rhythm, the ICD sends an electric shock to the heart. This restores a normal rhythm.