Implantable Cardioverter Defibrillators are useful to prevent sudden death in patients with known, sustained ventricular fibrillation or tachycardia. Studies have shown ICDs play a major role in preventing cardiac arrest in high-risk patients who haven't had, but are at risk for, life-threatening ventricular arrhythmias. The new-generation ICDs have a dual function which includes the ability to serve as a pacemaker that can stimulate the ticker to beat if the heart rate is detected to be too slow. You cannot predict the occurrence of a sudden cardiac arrest (SCA). A victim would require immediate treatment for survival. SCA can strike anyone, even infants and children. The best way to handle out-of-hospital cardiac emergencies is by getting trained in the life-saving CPR procedure. The procedure comprises chest compressions and rescue breaths. Select a certified training site for acquiring training, such as the AHA certified CPR Nashville in Tennessee. Courses for both healthc