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The myocardial microangiopathy in human and experimental diabetes mellitus. (A microscopic, ultrastructural,
Abstract:
The following microscopical aspects were found in the small intramural arteries in the myocardium of 30 diabetic patients: endothelial proliferations with focal protuberances leading to partial narrowing of the lumen, increased thickness of the arterial wall due to fibrosis and accumulations of neutral mucopolysaccharides: alteration of elastic fibres. Morphometrically, the arterial wall thickness and the arterial diameter were increased whereas the arterial density decreased in the diabetic heart. In 25 rats with streptozotocin-induced diabetes the small intramyocardial arteries were investigated at 11 to 40 weeks of diabetic state. Using morphometrical analysis a constant increase of arterial wall thickness paralleling the diabetes duration was found. Microscopically, the lesions consist in endothelial proliferation with bridging across the vascular lumen and slight perivascular and diffuse fibrosis. Ultrastructurally, the capillary basal lamina was thickened in the diabetic myocardium. In order to investigate the morphometrical data we used symbolic-logic as a decision method, by applying an original computer program based on the Quine-McCluskey algorithm. All our results together with the final symbolic-logic expression suggest that damage of the small intramyocardial arteries plays an important role in the pathogenesis of diabetic cardiomyopathy.
Insights
Diabetic cardiomyopathy involves damage to small heart arteries. This study found thickened arterial walls and narrowed lumens in diabetic patients and rats, indicating significant arterial changes contribute to the condition.
Area of Science:
- Cardiovascular Pathology
- Diabetology
- Vascular Biology
Background:
- Diabetic cardiomyopathy is a significant complication of diabetes mellitus.
- Alterations in small intramyocardial arteries are implicated in its pathogenesis.
Purpose of the Study:
- To investigate the microstructural and morphometrical changes in small intramyocardial arteries in diabetic patients and streptozotocin-induced diabetic rats.
- To elucidate the role of small arterial damage in the development of diabetic cardiomyopathy.
Main Methods:
- Microscopic examination of myocardial biopsies from diabetic patients.
- Morphometrical analysis of intramyocardial arteries in diabetic patients and rats.
- Ultrastructural analysis of capillaries.
- Application of symbolic-logic and the Quine-McCluskey algorithm for data analysis.
Main Results:
- Diabetic patients showed endothelial proliferations, fibrosis, and thickened arterial walls, leading to lumen narrowing.
- Diabetic rats exhibited a constant increase in arterial wall thickness correlated with diabetes duration.
- Capillary basal lamina thickening was observed in diabetic myocardium.
Conclusions:
- Damage to small intramyocardial arteries, characterized by structural and morphometrical alterations, is a key factor in the pathogenesis of diabetic cardiomyopathy.
- These arterial changes are progressive and related to the duration of diabetes.