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[Interstitial microfibrils in the myocardium in rheumatic and congenital heart defects]
Abstract:
Electron-microscopic and electron-histochemical studies of biopsies of the myocardium from the patients suffering from rheumatic and congenital affections of the heart showed that hyperplasia of aperiodic argyrophilic and ruteniophilic microfibrillae served as the ultrastructural equivalent of coarsening of the reticular frame of the hypertrophic myocardium. Relapse of the rheumatic process is accompanied by irregulation and possibly by an increase in the number of microfibrillae due to their accelerated neoformation and defibrillation of the collagen fibrils with a periodicity of 640 A. There was traced no direct relationship between the amount of microfibrillar material on the surface of the muscle cells and the extent of destruction of their organellae; this, however, did not exclude the possible interrelation between the myocardial insufficiency and hyperplasia of the myofibrillae as an integral component of fibrosis and sclerosis of the myocardium.
Insights
Hyperplasia of microfibrillae in the heart muscle is linked to coarsening of the reticular frame in hypertrophic myocardium. This change may relate to myocardial insufficiency, fibrosis, and sclerosis.
Area of Science:
- Cardiovascular Pathology
- Ultrastructural Biology
- Connective Tissue Research
Context:
- Rheumatic and congenital heart diseases often lead to myocardial hypertrophy.
- Understanding the ultrastructural changes in the myocardium is crucial for managing these conditions.
- The role of microfibrillae in myocardial remodeling requires further investigation.
Purpose:
- To investigate the ultrastructural basis of myocardial changes in rheumatic and congenital heart diseases.
- To correlate microfibrillar hyperplasia with the coarsening of the reticular frame.
- To explore the relationship between microfibrillar changes, myocardial insufficiency, and fibrosis.
Summary:
- Electron microscopy revealed hyperplasia of aperiodic argyrophilic and ruteniophilic microfibrillae in hypertrophic myocardium.
- This microfibrillar hyperplasia corresponds to a coarsened reticular frame.
- Relapses of rheumatic disease are associated with microfibrillar dysregulation and potential increases, linked to collagen fibril changes.
Impact:
- Identifies microfibrillar hyperplasia as an ultrastructural marker for myocardial remodeling in heart disease.
- Suggests a potential link between microfibrillar changes and myocardial insufficiency, fibrosis, and sclerosis.
- Provides insights into the cellular mechanisms underlying cardiac fibrosis and hypertrophy.