A comprehensive analysis of chronic complications of diabetes and their blood glucose management strategies.

Chronic Complications of Diabetes
Chronic complications of diabetes can affect all major organs of the body and are related to the interplay of various factors, including genetic susceptibility, hyperglycemia, oxidative stress, non-enzymatic glycosylation and the polyol pathway, and protein kinase C. These complications can occur individually or in different combinations, simultaneously or sequentially. Sometimes, complications are present even before a diabetes diagnosis, and some patients are diagnosed with diabetes because of these complications.

The main types of chronic complications are as follows:
Diabetic Macrovascular Disease
Diabetic macrovascular disease refers to atherosclerosis of the aorta, coronary arteries, cerebral arteries, renal arteries, and peripheral arteries. It is characterized by endothelial damage, proliferation and thickening of medial (smooth muscle) cells, deposition of lipids (cholesterol esters, phospholipids, triglycerides, etc.) to form plaques, and fragmentation of the elastic layer. These macrovascular lesions can also occur in non-diabetic patients, but compared to non-diabetic patients, diabetic patients experience earlier onset, faster progression, more severe disease, and higher mortality rates from atherosclerosis.

The prevalence of atherosclerosis, coronary heart disease, and cerebrovascular disease is 4 to 5 times higher in diabetic patients than in non-diabetic patients. Approximately 70% to 80% of diabetic patients die from diabetic macrovascular complications.

Diabetic Microvascular Disease
Microvessels generally refer to capillaries and microvascular networks between arterioles and venules. Diabetic microvascular disease mainly manifests in the retina, kidneys, nerves, and myocardial tissue, with diabetic nephropathy and retinopathy being particularly prominent. The characteristics of diabetic microvascular disease are: thickening of the capillary basement membrane, proliferation of microvascular endothelial cells, leading to distortion, deformation, and knotting of microvessel morphology. In addition, direct damage to microvessels by bacteria and endotoxins can lead to microaneurysm formation. Simultaneously, the microvascular wall becomes rough, the lumen narrows, elasticity weakens, and vasodilation occurs. Combined with increased blood viscosity, blood stasis, and blood cell aggregation caused by other metabolic abnormalities, significant exudation, bleeding, or increased fragility of the microvascular wall can occur around the microvessels. All of these are components of diabetic microvascular disease.