Effect of oxidative stress on endothelium in patients with heart failure and type 2 diabetes mellitus

Aim. To estimate the severity of endothelial dysfunction and effects of nitric oxide, thiol status and cystatin on the progression of chronic heart failure and chronic heart failure in type 2 diabetes mellitus. Methods. 80 patients (men and women) with chronic heart failure were included. All patients were divided into two groups: the first group 39 patients with chronic heart failure, the second 41 people with chronic heart failure and type 2 diabetes mellitus. The control group consists of 20 healthy donors. To obtain statistically significant differences with the control group the minimum sample size for observations was determined based on the target variance of a small sample (n=10). The lipid profile and carbohydrate metabolism, endothelin-1, cystatin, nitric oxide were evaluated. Statistical processing was performed using Microsoft Office Excel and IBM SPSS Statistics 20 software. Results. Changes in lipid metabolism were found in both groups, while an increase in carbohydrate metabolism was observed in patients with chronic heart failure with type 2 diabetes mellitus. Under conditions of oxidative stress in patients with chronic heart failure, a decrease in the content of thiol status and an increase in the amount of nitric oxide in the blood serum were recorded. The endothelin-1 level was elevated, particularly in the second group, which indicates a more serious endothelial dysfunction with increased glucose content in patients with chronic heart failure. Conclusion. The level of cystatin C as an atherogenic risk factor was equally increased in the studied patients, possibly it affected by the rate of disease progression; feasible to use these markers to detect the progression of chronic heart failure in the early stages.