Electron microscopic studies of microvasculature and sympathetic nerve fibers in dilated cardiomyopathy
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Published on: June 14, 2016
1Cardiovascular Department, Electron Microscopy Center, Chang Gung Memorial Hospital, Graduate Institute of Clinic Medicine, College of Medicine, Chang Gung University, Taipei, Taiwan, China.
Insights
Idiopathic dilated cardiomyopathy involves ultrastructural damage to microvessels and nerves in heart muscle. These changes contribute to myocardial degeneration and dysfunction in chronic heart failure.
Area of Science:
- Cardiovascular Pathology
- Ultrastructural Biology
- Myocardial Diseases
Background:
- Idiopathic dilated cardiomyopathy (IDC) is a significant cause of chronic heart failure.
- Understanding the underlying pathological mechanisms is crucial for effective treatment.
- Previous research has focused on myocardial cells, but microvascular and neural involvement requires further investigation.
Purpose of the Study:
- To examine the ultrastructural pathological changes in microvasculature and nerve fibers within the left ventricular myocardium of IDC patients.
- To correlate these findings with the progression of chronic heart failure.
Main Methods:
- Transmission electron microscopy (TEM) was used to analyze endomyocardial biopsy specimens.
- The study included 10 patients diagnosed with idiopathic dilated cardiomyopathy and chronic heart failure.
Main Results:
- Consistent ultrastructural pathological alterations were observed in microvessels and sympathetic nerves in IDC myocardium.
- Abnormal accumulation of collagen tissue and interstitial edema were frequently noted around myocardial cells, nerve endings, and capillaries.
- These findings indicate widespread structural damage beyond the cardiomyocytes themselves.
Conclusions:
- Microvessels and nerves, along with muscle cells, are integral components of the pathological process in dilated cardiomyopathy.
- Damage to the microvasculature and sympathetic nerves is a key pathogenetic mechanism driving myocardial degeneration and dysfunction.
- These ultrastructural findings offer insights into the role of microcirculation and neural integrity in the etiopathogenesis of IDC.
Objective:
To investigate the ultrastructural pathological alterations of the microvasculature and nerve fibers in the endomyocardial biopsied specimens of the left ventricular myocardium obtained from patients with idiopathic dilated cardiomyopathy and chronic heart failure.
Methods:
Transmission electron microscopic observations of endomyocardial biopsied specimens of the left ventricular myocardium were carried out in 10 patients with idiopathic dilated cardiomyopathy and chronic heart failure.
Results:
Various degrees of ultrastructural pathological alterations in the microvessels and sympathetic nerves in the diseased myocardium were consistently demonstrated in idiopathic dilated cardiomyopathy. In addition, abnormal accumulation of collagen tissue and edematous fluid were often seen in the interspace between myocardial cells and nerve endings and capillaries.
Conclusions:
Based on the ultrastructural pathological findings in this study, we consider that all the structures forming the muscle cells and the tissues around them, namely the microvessels and nerves may participate in the pathological process in the course of dilated cardiomyopathy. The damage of microvasculature and sympathetic nerves resulting from the underlying disease processes are considered to be an important pathogenetic mechanism responsible for progressive development of myocardial degeneration and dysfunction throughout the course of the disease. It is hoped that our data may provide some insights into the understanding of the role of microcirculation and sympathetic nerves in the etiopathogenesis of dilated cardiomyopathy.
