Study aim: Investigate of effectiveness of follow up care program on self efficacy and short term outcomes in patients with an Implantable Cardioverter Defibrillator. Design: Randomized, blinded, shame controlled clinical trial, with a blinded, Parallel group design of 154 patients Settings and conduct: Implanting Cardioverter Defibrillator is the popular treatment of patients suffering from cardiac arrhythmia. The research is performed in the electrophysiology sector of Shaheed Rajaie's Cardiovascular Medical and Research Center and after the approval of the ethical committee. Patients that need Implantable Cardioverter Defibrillator (ICD) were identified and after gaining their written satisfaction, sampling is performed. After they discharge, the researcher trains them face to face but the patients are not aware of their group. The researcher is not the part of the staff and the staff does not participate in the intervention. Participants/Inclusion and exclusion criteria: Patients 20 to 80 years old who being able to read, write, and speak Persian, and have received Implantable Cardioverter Defibrillator can participate in the study; they are excluded from study if they have a Commorbidity that prevent their discharge from the hospital, or suffering from cognitive disorders. Intervention groups: Patients in the control group are discharged after receiving routine care, including a booklet recognizing the device and its care; patients in the intervention group receive a follow-up care program in addition to routine care, including two 1.5 hour training sessions and An instruction book featuring other patients' experiences and weekly follow ups for up to 12 weeks.. Main outcome variables: Self-efficacy Expectations and Out come Expectations score; Anxiety score; Referral out of plan to Medical center; Number of received shock.