PREVIEW
Sudden cardiac arrest continues to exact a heavy toll among Americans, with most deaths related to ventricular fibrillation or ventricular tachycardias requiring electrical countershock. Advances in implantable cardioverter-defibrillator (ICD) technology are expanding the applications for these devices. Therefore, it is important that primary care physicians know when this therapy is indicated and how ICDs work. The authors discuss who should be considered for implantation of such a device and explain the technology involved.