Crataegus effects on cardiovascular determine the index coronary artery bypass surgery. The sample size in each group 12 and a total of 24 people will be, double-blind study is done. In phase two clinical trial study. During the study, patients will be recorded incidence of myocardial ischemia and any arrhythmia. In the end, patients were evaluated in terms of variables such as blood pressure, exercise tolerance test, blood levels of C-reactive protein (crataegus to assess the effects of oxidative stress) and blood Malondialdehyde level (to assess effects on inflammatory responses crataegus) is evaluated and these variables before the start of the study. At the end of the study as well as laboratory parameters such as hemoglobin, hematocrit, CBC, liver enzymes, bilirubin, cholesterol, triglycerides, erythrocyte sedimentation was measured and compared with blood levels in the first day of the study. Participants will review the conditions of entry and non-entry. Minimum age 40 and maximum age 80 years, comorbidity of chronic diseases such as kidney, liver, diabetes and COPD;In the intervention group, on the third-day surgery crataegus 30 oral drops three times a day for a month you desire and And the control group on the third day surgery to the mix 30 drops of placebo three times a day for a month daily. Use Crataegus to help improve cardiovascular patients undergoing coronary artery bypass surgery and lower blood pressure and reduce blood fat used. Laboratory parameters such as hemoglobin, thrombocytes, liver enzymes, bilirubin, cholesterol, erythrocyte remain in the normal range.