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[Submicroscopic indication of pathological cell growth in hypertrophic cardiomyopathy (HCM) in humans]
C H Becker1, V Boewer, J Waigand
1Zentralinstitut für Herz-Kreislauf-Forschung, Akademie der Wissenschaften, DDR, Berlin-Buch.
Insights
Electron microscopy reveals characteristic ultrastructural changes in hypertrophic cardiomyopathy (HCM) endomyocardial biopsies, aiding diagnosis and prognosis. Further molecular research is needed to clarify the etiology of HCM and related heart failures.
Area of Science:
- Cardiovascular Pathology
- Electron Microscopy
- Molecular Cardiology
Context:
- Transvascular endomyocardial biopsy is crucial for diagnosing heart diseases.
- Light microscopy is the primary diagnostic tool.
- Submicroscopic evaluation offers additional diagnostic and prognostic insights.
Purpose:
- To evaluate the utility of electron microscopy in diagnosing hypertrophic cardiomyopathy (HCM).
- To identify specific ultrastructural markers in endomyocardial biopsies.
- To explore etiological relationships and prognostic indicators in HCM.
Summary:
- Electron microscopy of endomyocardial biopsies revealed characteristic ultrastructural alterations in HCM, including fibrillary disarray, membrane folding, contraction bands, and mitochondrial/glycogen/lipid accumulation.
- While specific markers for idiopathic HCM were not found, these changes, along with vascular wall thickening, may aid diagnosis.
- Similarities with dilatative cardiomyopathy were noted, but dilatative cardiomyopathy is likely not a terminal stage of HCM.
Impact:
- Electron microscopy provides valuable submicroscopic morphological data for HCM diagnosis and prognosis.
- Findings highlight the need for advanced molecular biological research to determine the precise etiology of HCM and heart failure.
- This study contributes to understanding the complex pathology of cardiomyopathies at a cellular level.
Abstract:
The increasing application of transvascular endomyocardial biopsy for diagnostic verification of various heart diseases and elucidation of their etiology relies mainly on light microscopical methods. It is shown by hypertrophic cardiomyopathy as an example that also submicroscopical findings may be of value in diagnostic work, prognosis, and investigating research for etiological relationships. Specific morphological markers for idiopathic HCM were not demonstrable; nevertheless, some characteristic alterations such as fibrillary disorder, excessive folding of nuclear-, intercalated disc-, and sarcolemmal membranes, contraction bands, accumulation of mitochondria, glycogen, and lipid droplets, among others as well as sometimes the thickening of vascular walls with its unknown relations to the so-called "small vessel disease" may be helpful when endomyocardial biopsies are examined with the electron microscope too. Though many cytomorphologic findings are similar to those in dilatative cardiomyopathy, this disease probably is not a final state of HCM. In order to prove the actual cause of both heart failures, more intensive investigating research especially at the molecular biological level is required.