Leila Sabzmakan - Lecture, Department of Public Health, School of Health, Ghazvin University of Medical Sciences, Ghazvin, Iran
Sayyed Mohammad Mahdi Hazavei - Associate Professor, School of Health Services, Department of Health, Isfahan University of Medical Sciences, Isfahan, Iran
Katayoun Rabiei - General Practitioner, Cardiac Rehabilitation Research Center, Isfahan Cardiovascular Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran
Hassan Jahani Hashemi - Assistant Professor, Department of Biostatistics, School of Health, Ghazvin University of Medical Sciences, Ghazvin, Iran.
Mohsen Mirmohammad Sadeghi - Assistant Professor, Department of Cardiac Surgery, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.
Hamidreza Roohafza - Associate Professor, Psychosomatic Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.

   BACKGROUND: This study was conducted to evaluate the effect of an educational intervention on depression and quality of life (QoL) of patients with coronary artery bypass grafting (CABG) surgery.    METHODS: This was a quasi-experimental study on ۵۴ patients after CABG who were randomly divided into the test and control groups. To evaluate depression, Cardiac Depression Scale was used. Then a researcher-made questionnaire of Predisposing, Reinforcing, Enabling Causes in Educational Diagnosis and Evaluation (PROCEED) was used and finally the ۳۶-item Short-Form Health Survey (SF-۳۶) was employed. The intervention was done through ۹ educational sessions, once a week, lasting ۶۰-۹۰ minutes based on PRECEDE model and it was followed-up for two months.    RESULTS: After the educational intervention, the mean score of predisposing causes, enabling causes, reinforcing causes and self-care behaviors significantly increased in the test group compared to the control group (P < ۰.۰۰۱). There was a significant difference in mean score of depression between the two groups after the educational intervention (P < ۰.۰۰۱). In addition, there was a significant difference after the intervention in physical functioning (P = ۰.۰۴), mental problems related to QoL (P < ۰.۰۰۱) and generally, in psychological health (P = ۰.۰۴).    CONCLUSION: The findings of this study confirmed the efficacy of PRECEDE educational model and its components (predisposing, enabling and reinforcing causes) and behavioral factors of it on improvement of psychological status and depression of the patients which finally increased QoL of patients after CABG.         Keywords: Educational Intervention, Depression, Quality of Life, PRECEDE Model.