Objective:To provide scientific evidence for infection prevention and control by analyzing the risk factors of surgical site infection, which can move forward the gateway of infection prevention and control.Methods:The surgery-related information of patients admitted to the Department of General Surgery and Department of Orthopedics, People's Hospital of Guangnan Hospital of Yunnan province from November 2016 to August 2019 was retrospectively analyzed. According to whether postoperative surgical site infection occurred, the patients were divided into an infection group and a non-infection group. Logistic regression model was used to analyze the risk factors of surgical site infection.Results:A total of 9 346 patients, consisting of 117 patients in the infection group and 9 229 patients in the non-infection group, were included for final analysis. In the infection group, the incidence of surgical site infection was 1.25%. Multivariate analysis showed that hypoproteinemia ( OR = 2.585), unclean incision ( OR = 3.243 and 5.125), and operation duration more than 3 hours ( OR = 2.315), blood transfusion ( OR = 2.239), drainage tube placement ( OR = 2.133) and indwelling catheter placement ( OR = 1.973) were the independent risk factors for surgical site infection, while prophylactic use of antibiotics was a protective factor ( OR = 0.383). Conclusion:Individual factors, operation-related factors, and treatment-related factors are closely related to the occurrence of surgical site infection. Much attention should be paid to the clinical issues like preoperative hypoproteinemia, perioperative prophylactic use of antibiotics and postoperative drainage tube and indwelling catheter placement.

As a congenital anomalous coronary artery anatomy , the myocardial bridging of the left anterior descending ar-tery has a high incidence and detection rate.Traditionally, myocardial bridgings are considered to be benign anatomical vari-ants.However, as medical research progresses, more and more cardiac events have been found to be associated with myocardial bridgings.By summarizing recent literature reports, this review describes the anatomy and pathophysiology, classification and diagnosis of the left anterior descending artery myocardial bridgings .

Coronary artery disease is currently one of the leading cause of death from disease,and coronary artery bypass grafting(CABG) is an effective treatment for it.Saphenous vein graft(SVG) is one of the most commonly employed conduits for CABG.However,the long-term patency of SVG harvested by conventional technique is poor.No-touch SVG harvesting technique can provide better structural,morphological and functional protection of the vein wall,also can receive satisfied longterm patency rate.