The introduction of pacemakers and implantable cardioverter-defibrillators (ICDs) has substantially changed the medical and surgical management of patients with cardiac rhythm disease. In the case of patients with ICDs, these devices are programmed to deliver a strong electrical shocks. In adults, multiple studies have suggested that patients at risk of receiving shocks from their device have an increased prevalence of anxiety and depression. Very few studies have looked at this question in children. We propose to evaluate a cohort of patients age 6 to 20 with ICDs, compared to a cohort of patients with pacemakers, assessing each group for the presence of depressive and anxiety disorders, including post-traumatic stress disorder (PTSD).