1.    A pulse generator, which is a tiny computer powered by battery.

2.    One or two leads, wires that deliver electrical signals between the pulse generator and the heart.

3.    Electrodes at the ends of the leads, to help deliver the signals when the device detects abnormal heart rhythms. The generator will send electrical signals to the heart to return to normal rhythm.

1. Bleeding or hematoma, and infection where the implantable cardioverter defibrillator (ICD) was implanted.
2. Allergic reaction to the medications used during the procedure.
3. Damage to blood vessels.
4. Bleeding in the pericardium.
5. The implantable cardioverter defibrillator (ICD) sends abnormal signals to the heart or malfunctions or the leads come loose.
6. Stroke, heart attack, or other serious complications, which are uncommon.
7. Death (rare).

1. Bleeding, swelling or increased pain at the implantation site
2. Fever
3. Dizziness
4. Fainting
5. Chest pain
6. Difficulty breathing

Medication.