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Cardiomyopathy associated with Leigh's disease
Insights
Leigh's disease in an infant caused significant heart enlargement due to thickened ventricular walls. Microscopic analysis revealed mitochondrial abnormalities, suggesting a mitochondriopathy underlies this cardiac issue.
Area of Science:
- Pediatric Pathology
- Cardiology
- Mitochondrial Diseases
Background:
- Leigh's disease is a severe neurological disorder typically presenting in infancy.
- Cardiomegaly, or heart enlargement, can be a rare but serious complication.
- Understanding the cardiac manifestations is crucial for comprehensive patient care.
Observation:
- A female infant presented with clinical and postmortem findings of Leigh's disease and significant cardiomegaly.
- Postmortem examination revealed symmetrical thickening of both ventricular walls and the septum.
- Light microscopy showed widespread cardiac fiber disarray, particularly in the ventricular septum.
Findings:
- Ultrastructural examination identified a marked reduction in myofibrils within cardiac muscle cells.
- An excess of mitochondria was observed, alongside structural abnormalities including tubular and myelinic transformation of cristae.
- These mitochondrial changes strongly suggest a primary mitochondriopathy as the cause of cardiomegaly in this case of Leigh's disease.
Implications:
- This case highlights a potential link between Leigh's disease and mitochondrial cardiomyopathy.
- The findings underscore the importance of cardiac evaluation in infants diagnosed with Leigh's disease.
- Further research into mitochondrial dysfunction in pediatric heart disease is warranted.
Abstract:
Clinical and postmortem findings in a female infant, suffering from Leigh's disease and cardiomegaly are described. The cardiac enlargement was due to symmetrical thickening of both ventricular walls and the septum. On light microscopy a widespread fibre disarray with a slight predilection for the ventricular septum was observed. Ultrastructural changes included an extreme reduction in the number of myofibrils and an excess of mitochondria. Abnormalities of the mitochondrial structure with tubular and myelinic transformation of the cristae suggested that a mitochondriopathy is responsible for the cardiomegaly in Leigh's disease.