In this review article, we summarize the psychological aspects of implantable cardioverter-defibrillators (ICDs) that are used to treat cardiac arrhythmias and prevent sudden cardiac death. Depression, anxiety and stress are the most common psychological symptoms that occur in as many as one third of the ICD patients. Fears from unpredictable and painful shocks and fears that the ICD would not work are the main sources of these adverse symptoms. Satisfaction with the treatment has a positive impact on the overall quality of life, but it does not change significantly after the implantation. One of the factors influencing successful treatment is a satisfactory psychological status that may be positively affected by education, psychological consultations and interventions.