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Hypertrophic non-obstructive cardiomyopathy caused by disorder of the myofiber texture
Insights
A rare case of hypertrophic cardiomyopathy in a 10-year-old boy was linked to abnormal myofiber texture. This condition caused severe heart hypertrophy, fibrosis, and conduction system abnormalities, leading to complex heart rhythm issues.
Area of Science:
- Cardiovascular Pathology
- Pediatric Cardiology
- Cardiac Histology
Background:
- Hypertrophic cardiomyopathy (HCM) is a primary myocardial disease.
- Myofiber disarray is a common histological finding in HCM.
- Non-obstructive variants require detailed pathological investigation.
Observation:
- A 10-year-old boy presented with symptoms suggestive of cardiac dysfunction.
- Clinical examination revealed concentric biventricular and septal hypertrophy.
- Associated cardiac anomalies included an abnormal septum membranaceum and accessory tricuspid valve leaflet.
Findings:
- Severe cardiac hypertrophy was accompanied by extensive interstitial, subendocardial, and arterial intimal fibrosis.
- Electron microscopy showed diverse stages of myocardial cell hypertrophy and degeneration.
- Pathological changes in the sinus node and conduction system resulted in tachycardia-bradycardia syndrome, left bundle branch block, and complete atrioventricular block.
Implications:
- This case highlights a rare etiology of pediatric hypertrophic cardiomyopathy due to myofiber texture disorder.
- The findings underscore the importance of detailed histopathological examination in complex pediatric cardiac cases.
- Understanding these rare presentations is crucial for accurate diagnosis and management of pediatric heart disease.
Abstract:
A case of hypertrophic non-obstructive cardiomyopathy caused by a disorder of the myofiber texture was observed in a 10 year old boy. The heart weighed 390 g and showed concentric hypertrophy of the left and right ventricles as well as of the ventricular septum. Additional findings consisted in an abnormal septum membranaceum and a accessory tricuspid valve leaflet. Severe cardiac hypertrophy was associated with prominent interstitial and subendocardial fibrosis, and pronounced intimal fibrosis of the intramural arteries. Electron microscopy revealed various degrees and stages of hypertrophy of the myocardial cells combined with severe degenerative changes. Additional changes of the sinus node and conduction system were responsible for a tachycardia-bradycardia syndrome, complete left bundle branch block and final total AV-block.