Background and aims: Coronary artery disease (CAD) is one of the main causes of death worldwide and coronary artery bypass grafting (CABG) surgery accounts for 1.4% of all operating room procedures. Considering the importance of the above-mentioned issue, the present study aimed to assess CAD risk factors in CABG patients to provide more accurate information for health authorities. Methods: To this end, data of all patients with isolated primary on-pump CABG were collected from March 2014 to March 2016. The major risk factors of CAD were recorded as a history of cigarette smoking, dyslipidemia, hypertension, diabetes mellitus (DM), advanced age, a family history of CAD, obesity, and male gender. Statistical analyses were performed by SPSS using a t test, as well as the chi-square and Fisher exact tests, and the P value less than 0.05 was considered statistically significant. Results: During a 24-month period, 895 patients underwent isolated primary on-pump CABG in the only open-heart surgery center in the West Azerbaijan province of Iran. The mean age of the patients was 60.4±10.3 years (within the range of 40 to 93 years). In addition, most of the patients amounting to 525 cases (58.7%) were in the age group of 55-70 years and had two or more risk factors. Further, 98.8% of males (age ≥45) and 68.2% of females (age ≥ 55) were old, and 73.3% and 26.7% of the patients were men and women, respectively. Furthermore, risk factors such as hypertension, cigarette-smoking, DM, hyperlipidemia, obesity, and family history were observed in 53.3%, 47.9%, 37.8%, 28.5%, 61.1%, and 19.3% of the patients, respectively. As regards gender, the prevalence of coronary risk factors like hypertension (60.7 vs. 50.6%, P=0.005), DM (51.9 vs. 32.6%, P=0.001), hypercholesterolemia (43.5 vs. 23%, P=0.001), and obesity (68.2 vs. 58.5%, P=0.005) were higher in women but other factors such as smoking (19.2 vs. 58.4%, P=0.001) and positive family history (14.6 vs. 21%, P=0.01) were higher in men. Conclusion: Overall, the prevalence of most risk factors was more common among under 55-year group, especially in women, and this is a warning for increasing CADs in the future
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