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Diabetic nephropathy is a long-term kidney disease that happens when diabetes mellitus goes on for a long time. It is marked by long-term albuminuria, a falling glomerular filtration rate, and high blood pressure. It is a major cause of end-stage kidney disease around the world. The pathogenesis entails metabolic and haemodynamic alterations generated by hyperglycaemia that compromise renal glomeruli, resulting in the thickness of the glomerular basement membrane, mesangial enlargement, and glomerulosclerosis. Advanced glycation end-products, oxidative stress, and inflammation lead to progressive fibrosis and renal failure.

Diabetic nephropathy clinically presents as elevated proteinuria, oedema, and ultimately renal failure. Microalbuminuria, which can be found with sensitive urine testing, is common in the early stages. Progression is connected to poor control of blood sugar and blood pressure. Nodular glomerulosclerosis (Kimmelstiel-Wilson lesions), mesangial matrix buildup, and arteriole hyalinosis are some of the most important histologic characteristics.

Management focuses on controlling blood sugar, high blood pressure (typically with ACE inhibitors or ARBs), and changes to lifestyle to slow down the disease's progress. Regular tests for albuminuria help identify it early. Dialysis or transplantation may be necessary for advanced instances. Knowing how molecules and cells work is important for developing targeted treatments that can help prevent kidney damage in people with diabetes.