Imaging methods in assessing the surveillance of type 2 diabetes mellitus for cerebrovascular reserve and brain disease in patients with hemodynamically significant carotid stenosis

Introduction. Type 2 diabetes is the most common form of endocrine disease. Diabetes is a well-established risk factor for stroke. Carotid endarterectomy (CEE) is the main method of preventing a serious complication of stroke in patients with carotid stenosis. Consequently, the assess of type 2 diabetes on the results of CEE is an urgent problem of angiosurgery.Aim: To assess effect of type 2 diabetes on cerebrovascular reserve capacity and brain structure in patients with carotid atherosclerosis by ultrasound and magnetic resonance diagnostic.Material and Methods. 44 patients with hemodynamically significant stenosis of the internal carotid arteries (ICA), who underwent ultrasound and magnetic resonance examinations of the carotid arteries at the pre- and postoperative stages were included in this study. Two groups were formed: group I (n =15) - with a verified diagnosis of type 2 diabetes, group II (n = 29) - without diabetes. To assess the cerebrovascular reserve, functional hypercapnic and hyperoxic tests were performed.Results. The analysis of the results showed statistically significant differences in the ICA blood flow in both groups. Intergroup comparison before surgery in the middle cerebral artery on the side of hemodynamically significant stenosis revealed a statistically significant difference in pulsation and peripheral resistance index. In the common carotid arteries on both sides, significant intergroup differences were found in the velocity parameters of blood flow after the CEE operation. The reactivity index in patients with surgical stenosis with type 2 diabetes in the hyperoxic test was statistically significantly different on the side of the stenosis compared to the same indicator in the group without diabetes. There were no statistically significant differences in the hypercapnic test. The value of reactivity index indicates a negative or paradoxical reaction.Conclusion. The use of simple and accessible functional tests to assess cerebrovascular reserve, plaque structure and changes in the brain in patients with type 2 diabetes at the stage of preoperative preparation according to ultrasound and MRI studies allows us to correct the treatment and subsequent protection of the brain at the stage of surgery to prevent possible complications.