Different ICD lead systems

Chest radiographs of two different implantable cardioverter-defibrillator (ICD) systems. Left panel shows an ICD epicardial lead system. Epicardial sensing electrodes are located on the left ventricle (arrow) and the three epicardial patch electrodes are located on the right atrium, and the inferior and lateral walls of the left ventricle. Right panel shows a dual coil transvenous ICD lead system with a pulse generator in the pectoral region.