An implantable cardioverter defibrillator (ICD) is a small
battery-operated device that monitors the heart’s rhythm and
provides appropriate treatment. Most ICDs have both pacemaker
and defibrillator functions. If the heart beats too slowly, the
ICD can help the heart beat at a normal pace. If the heart
begins to beat in a disorganized way, the device provides a
shock to restore a normal rhythm. ICD implantation is the
surgical insertion of an ICD. Reasons for Procedure Certain
heart rhythms are extremely dangerous and can lead to sudden
cardiac death or cardiac arrest . Some irregular rhythms that
may require an ICD implant include: - Bradycardia —heart beating
too slowly - Ventricular tachycardia —heart beating too rapidly
- Ventricular fibrillation —heart muscle not pumping, but just
quivering ICDs are implanted in patients who: - Have had one or
more episodes of serious arrhythmias (irregular heart rhythms) -
Have had a heart attack and at high risk for arrhythmias - Have
a high risk of dangerous arrhythm