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How does high blood pressure worsen vascular complications of diabetes mellitus?

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An anatomical illustration of the human pancreas shows its location near the stomach and intestines, a detailed cross-section highlighting ducts and the islet of Langerhans, and an inset of pancreatic tissue histology with labeled alpha, beta, and delta cells. — diabetes mellitus The islets of Langerhans are responsible for the endocrine function of the pancreas. Each islet contains beta, alpha, delta, and pancreatic polypeptide (PP) cells that are responsible for the secretion of pancreatic hormones. Beta cells secrete insulin, a well-characterized hormone that plays an important role in regulating glucose metabolism.

In patients with diabetes mellitus, hypertension (high blood pressure) acts as a significant aggravating factor that worsens both large-vessel and small-vessel vascular complications.

While diabetes itself causes damage to blood vessels—such as the thickening and leakage of small vessels in the retina and kidneys—the presence of high blood pressure accelerates these degenerative processes. Specifically, in the context of diabetic eye disease, hypertension is known to exacerbate the severity of retinal damage, often leading to increased hemorrhaging and swelling.123

Because hypertension increases the mechanical stress on the vascular system, it promotes the progression of atherosclerosis in large arteries and contributes to the obstruction of smaller vessels. Consequently, managing blood pressure is a critical clinical strategy, as it can help delay the onset and progression of these debilitating vascular complications.13