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Diabetes and coronary artery disease: what a coincidence?
1Department of Medicine, University of Kuopio, Finland.
Insights
Diabetes significantly increases coronary artery disease (CAD) risk. Diabetic nephropathy exacerbates this, while non-insulin-dependent diabetes shows risk factor changes even before diagnosis, impacting women more severely.
Area of Science:
- Cardiology
- Endocrinology
- Metabolic Diseases
Background:
- Coronary artery disease (CAD) incidence is notably higher in both insulin-dependent diabetes mellitus (IDDM) and non-insulin-dependent diabetes mellitus (NIDDM).
- The underlying mechanisms for this association are not fully understood.
- In IDDM, cardiovascular risk factors are normal with good metabolic control, but diabetic nephropathy leads to hypertension and lipid abnormalities.
Purpose of the Study:
- To investigate the relationship between diabetes mellitus and the increased incidence of coronary artery disease.
- To explore the role of diabetic nephropathy and other risk factors in accelerating atherosclerosis in diabetic patients.
Main Methods:
- Comparative analysis of cardiovascular risk factors in diabetic and non-diabetic populations.
- Assessment of the impact of diabetic nephropathy on CAD development.
- Evaluation of lipid profiles, blood pressure, and glucose tolerance in relation to CAD incidence.
Main Results:
- In IDDM, CAD risk increases post-30, especially with nephropathy. Premenopausal women with IDDM have CAD rates similar to men with IDDM.
- IDDM can promote atherosclerotic lesion progression, increasing CAD risk even without nephropathy.
- NIDDM is linked to hypertension and atherogenic lipid/lipoprotein profiles, present even in impaired glucose tolerance (IGT).
- CAD incidence is significantly higher in NIDDM patients, particularly women, compared to non-diabetics.
Conclusions:
- Diabetes mellitus, both IDDM and NIDDM, is a significant risk factor for CAD.
- Diabetic nephropathy and associated metabolic changes (hypertension, dyslipidemia) accelerate atherogenesis.
- NIDDM presents with multiple cardiovascular risk factors, increasing CAD risk, especially in women.
Abstract:
The incidence of coronary artery disease (CAD) is markedly increased in both insulin-dependent diabetes mellitus (IDDM) and non-insulin-dependent diabetes mellitus (NIDDM). The background for this coincidence is as yet incompletely understood. In uncomplicated IDDM, the levels of cardiovascular risk factors do not show any substantial abnormalities if the metabolic control is good. However, when diabetic nephropathy ensues, even in its early microalbuminuric stage, blood pressure tends to become elevated and multiple atherogenic plasma lipid abnormalities appear. In juvenile-onset IDDM, increased occurrence of clinically manifest CAD emerges after the age of 30 years and becomes particularly marked in patients with diabetic nephropathy. Premenopausal female patients with IDDM develop CAD almost as often as male diabetics with IDDM of the same age--a situation in sharp contrast to that in nondiabetics, with a large excess of CAD in men. IDDM may act as a promoter of the progression of atherosclerotic lesions in subjects who are otherwise prone to develop them. This could explain why patients with IDDM have an increased risk of CAD, even in the absence of diabetic nephropathy, which enhances atherogenesis through several mechanisms. NIDDM is associated with multiple changes in cardiovascular risk factors, including abnormalities in the levels and composition of plasma lipids and lipoproteins and increased frequency of hypertension. These changes in cardiovascular risk factors are already present in subjects with impaired glucose tolerance (IGT), the precursor stage of NIDDM. In patients with NIDDM, the incidence of CAD is markedly increased compared to that in nondiabetic subjects of the same age, and more markedly in women than in men.(ABSTRACT TRUNCATED AT 250 WORDS)