Myocardial injury is used for postprocedural cTn value is Darglitazone sodium salt. So, we used many different cTnI cut points. Although a number of studies have investigated the risk factors associated with periprocedural myocardial infarction or injury, less of them focused on diabetic patients or the impact of glycemic control on periprocedural myocardial infarction or injury in diabetic patients. And elevated HbA1c or poor glycemic control is associated with increased risk of cardiovascular events in diabetic patients, but whether elevated HbA1c is still associated with increased risk of myocardial infarction or injury following elective PCI in diabetic patients is still unknown. In the present study, we included 994 diabetic patients undergoing elective PCI to determine the relation of preprocedural HbA1c levels with postprocedural cTnI elevation. Univariate analysis showed that some clinical and procedural characteristics were associated with postprocedural cTnI levels. There were almost identical pattern between the inverse associations of HbA1c and fasting glucose with postprocedural cTnI levels. However, after multivariate stepwise analysis, HbA1c was still in the model, but fasting glucose was not. HbA1c reflects both fasting and postprandial blood glucose levels over the previous CID44216842 months, has less fluctuation individually than fasting blood glucose level, and can be measured in the nonfasting state. These characteristics may result that HbA1c outperform fasting glucose in prediction of periprocedural myocardial injury. Patients in the highest quartile of HbA1c were likely to receive more predilation and postdilation, and longer total stent length implanted. This maybe reflect high atherosclerotic burden in these patients with high HbA1c levels. However, these patients experienced reduced risk of periprocedural myocardial injury. Regardless of calculating as quartiles or continuous variables, higher HbA1c levels were associated with less risk periprocedural myocardial injury. A U-shaped or J-shape association between HbA1c and periprocedural myocardial injury did not appear. Interestingly, there was also an inverse relationship between HbA1c levels and mortality in diabetic patients with advanced systolic heart failure.