en تخصصي Special پژوهشي Research <p dir="ltr" style="text-align: justify;"><strong>Background:</strong> The coronary artery bypass grafting (CABG) is performed to completely or&nbsp;partially relieve the symptoms of coronary heart disease (CHD). One of the most important&nbsp;goals of this operation is the improvement of quality of life (QoL). The data obtained on healthrelated&nbsp;quality of life (HRQoL) represents the functional limitations and the alleviation of&nbsp;symptoms among patients. Many factors influence HRQoL, including age at the time of surgery,&nbsp;left ventricular condition, record of heart stroke, type and the number of grafts, and so on. The&nbsp;purpose of the study was to examine the HRQoL and its related factors after CABG among the&nbsp;patients referring to selected therapeutic-educational centers of Tehran University of Medical&nbsp;Sciences.<br> <strong>Methods: </strong>Cross sectional and descriptive-correlation on 140 patient by using the purposive&nbsp;sampling method, who had undergone CABG in the last 4 months, participated in this research.&nbsp;The 36-item short-form (SF-36) questionnaire was used in this study to evaluate the disease and&nbsp;its related factors. The data have been collected through a reliable and valid questionnaire of life&nbsp;quality related to health (SF-36) then were analyzed using SPSS.11.5 and descriptive statistics&nbsp;and paired t-test, one wayANOVA test and Pearson correlation were use as well.<br> <strong>Results: </strong>The findings indicated that age (P=0.000), body mass indexBMI (P=0.000), economic&nbsp;status (P=0.000), employment (P=0.012, P=0.016, P=0.007 on total, Physical Component Scale&nbsp;(PCS) and Mental Component Scale (MCS) respectively), prior myocardial infarctionmyocardial&nbsp;infarction (MI) (P=0.000), suffering from chronic disease (P=0.000), New York Heart Association&nbsp;(NYHA) (P=0.000) and Ejection Fraction (EF) (P=0.012, P=0.016, P=0.007 on PCS, MCS,&nbsp;respectively) had significant effect on the physical and the psychological dimensions and the&nbsp;total QoL. Besides, gender had a significant effect on QoL with regard to the psychological&nbsp;dimension (P=0.015), andall of them were related Quality Of Life (QoL) regarding the physical&nbsp;dimension (P=0.23). Finally, educational level had a significant effect on QoL with regard to the&nbsp;physical dimension (P=0.31).<br> <strong>Conclusion:</strong> The findings indicated that the aforementioned factors relate patients&rsquo; QOL, which&nbsp;should draw the attention of the health system.</p> Coronary artery, Bypass graft, Quality of life health related, Undergoing, Physical Component scale, Mental component scale 151 157 http://jccnc.iums.ac.ir/browse.php?a_code=A-10-43-1&slc_lang=en&sid=1 Ezat Jafar Jalal ejalal2005@yahoo.com 10031947532846002870 10031947532846002870 No Deptartment of Nursing, School of Nursing and Midwifery, Iran University of Medical Sciences, Tehran, Iran. Reza Nabiamjad rezaamjad8504@gmail.com 10031947532846002871 10031947532846002871 Yes Department of Nursing, School of Nursing and Midwifery, Tehran University of Medical Sciences, Tehran, Iran. Mohamadtaghi Safdari mtsafdari@yahoo.com 10031947532846002872 10031947532846002872 No Department of Nursing, School of Nursing and Midwifery, Tehran University of Medical Sciences, Tehran, Iran. Davod Rasouli Davod Rasouli@yahoo.com 10031947532846002873 10031947532846002873 No Department of Nursing, Faculty of Nursing and Midwifery, Urmia University of Medical Sciences, Urmia, Iran. Hamid Hagani haghani511@yahoo.com 10031947532846002874 10031947532846002874 No Department of Statistics, School of Health Management and Information Sciences, Iran University of Medical Sciences, Tehran, Iran.