The authors present two cases of patients with perforation of the right ventricular wall by the implantable cardioverter defibrillator (ICD) lead. The complication was resolved by cardiosurgical revision and epicardial leads stitched onto the diaphragmatic wall of the heart. The perforation was identified by electrical parameter changes of the leads, echocardiography, and computed tomography. Both patients had satisfactory values of electrical parameters and ICD function with epicardial leads. The importance of regular follow-up and a check of the lead parameters are emphasized.