Mohammad Zirak - Department of Medical Surgical Nursing, School of Nursing and Midwifery, Zanjan University of Medical Science, Zanjan, Iran
Nahid Dehghan Nayeri - Ph.D, Prefossor of Nursing of Nursing Management Department, Nursing and Midwifery Care Research Center, Tehran University of Medical Sciences, Tehran, Iran
Mohammad Ali Yadegary - Department of Operating Room and Anesthesiology, school of Nursing and Midwifery, Zanjan University of Medical Sciences, Zanjan, Iran
Khatereh Seylani - Ph.D, Assistant Professor in critical care nursing department, faculty of Nursing and Midwifery, Tehran University of Medical Sciences, Tehran, Iran
Elham Navab - Ph.D, Associated Professor of Department of Critical Care Nursing, School of Nursing and Midwifery, Tehran University of Medical Sciences, Tehran, Iran

Background: Identifying the factors associated with the adherence to treatment regimen is a useful guide for health care providers to provide appropriate treatment regimens and promote the adherence to treatment. Objectives: The aim of this study was to determine the status of adherence to treatment regimen and its related factors in patients undergoing coronary artery revascularization therapies (CART) in selected hospitals of Zanjan in ۲۰۱۷. Methods: This correlational study was conducted in Zanjan, Iran in ۲۰۱۷. In total, ۳۱۸ patients who had undergone CART were selected by systematic random sampling to participate in the study. The study tools included demographic factors, factors related to the disease, and the Nayeri et al questionnaire of adherence to treatment regimen. Descriptive and inferential statistics were used to analyze the data through SPSS software version ۲۳. Results: Results of this study showed that, the mean score of adherence to treatment regimen by the patients was ۱۲۸.۱۲±۷.۵۱ and the status of adherence to treatment regimen was at moderate level. Multiple linear regressions showed that variables such as type of treatment, duration of disease, age, and gender were associated with the adherence to treatment regimen. So that, with the increasing age (p=۰.۰۰۲) and the duration of the disease (p=۰.۰۳۴), adherence to treatment regimen was also increased. Furthermore, the score of adherence to treatment regimen was better in patients who had coronary artery bypass surgery (CABG) (p=۰.۰۰۲) than angioplasty procedure, and also it was better in women (p=۰.۰۳۲) than men. Conclusion: About half of the patients with CART do not adhere to their treatment regimen. Age, gender, level of education, duration of illness and type of treatment are the predictors of adherence to treatment regimen. Understanding these factors can be used as a guide in designing interventions and conducting further studies to improve the adherence to treatment regimen. Adherence to treatment regimen is not only a complicated variable that has many determinants, but also is a continuous process.

Keywords: coronary artery disease, Adherence to treatment regimen, angioplasty, coronary artery bypasses graft surgery