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Diabetes mellitus and hypertension
1Medical Services, Department of Veterans Affairs Medical Center, Miami, FL 33125.
Insights
Hypertension and diabetes often coexist, increasing cardiovascular risks. Understanding the causes of high blood pressure in diabetics, like insulin resistance, is key to managing this complex relationship and improving patient outcomes.
Area of Science:
- Endocrinology and Cardiovascular Medicine
Background:
- Diabetes mellitus and hypertension frequently coexist, a combination that significantly elevates risks for cardiovascular and microvascular complications.
- The interplay between diabetes and hypertension is complex, with diabetic nephropathy being a notable, but not sole, contributor to elevated blood pressure in diabetic individuals.
Purpose of the Study:
- To explore the multifactorial etiology of hypertension in patients with diabetes mellitus.
- To highlight the role of insulin resistance and other metabolic factors in the pathogenesis of hypertension in diabetic populations.
Main Methods:
- Review of existing literature on the pathophysiology of hypertension in diabetes.
- Analysis of factors contributing to increased peripheral vascular resistance and sodium balance in diabetic patients.
- Examination of the link between insulin resistance, hyperinsulinemia, and cardiovascular disease risk.
Main Results:
- Hypertension in diabetics is often characterized by increased peripheral vascular resistance and potentially altered sodium exchange.
- Insulin resistance and hyperinsulinemia are increasingly recognized as significant contributors to hypertension in both type I and type II diabetes.
- Abnormalities in lipid metabolism, platelet function, and clotting factors are additional cardiovascular risks in diabetic individuals.
Conclusions:
- The etiology of hypertension in many diabetic patients remains 'essential,' underscoring the need for further research beyond renal disease.
- Addressing insulin resistance and associated metabolic abnormalities is crucial for managing hypertension in diabetes.
- Antihypertensive therapy in diabetics must aim to reduce both blood pressure and the heightened overall cardiovascular risk.
Abstract:
Diabetes mellitus and hypertension are common diseases that coexist at a greater frequency than chance alone would predict. Hypertension in the diabetic individual markedly increases the risk and accelerates the course of cardiac disease, peripheral vascular disease, stroke, retinopathy, and nephropathy. Our understanding of the factors that markedly increase the frequency of hypertension in the diabetic individual remains incomplete. Diabetic nephropathy is an important factor involved in the development of hypertension in diabetics, particularly type I patients. However, the etiology of hypertension in the majority of diabetic patients cannot be explained by underlying renal disease and remains "essential" in nature. The hallmark of hypertension in type I and type II diabetics appears to be increased peripheral vascular resistance. Increased exchangeable sodium may also play a role in the pathogenesis of blood pressure in diabetics. There is increasing evidence that insulin resistance/hyperinsulinemia may play a key role in the pathogenesis of hypertension in both subtle and overt abnormalities of carbohydrate metabolism. Population studies suggest that elevated insulin levels, which often occurs in type II diabetes mellitus, is an independent risk factor for cardiovascular disease. Other cardiovascular risk factors in diabetic individuals include abnormalities of lipid metabolism, platelet function, and clotting factors. The goal of antihypertensive therapy in the patient with coexistent diabetes is to reduce the inordinate cardiovascular risk as well as lowering blood pressure.