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Electron microscopy of myocardial tissue. A nine year review
H S Mudhar1, B E Wagner, S K Suvarna
1Department of Histopathology, Northern General Hospital, Herries Road, Sheffield S5 7AU, UK.
Insights
Routine electron microscopy of myocardial tissue provided limited additional diagnostic value beyond light microscopy. Further research is needed to understand non-specific ultrastructural findings in cardiac samples.
Area of Science:
- Cardiovascular Pathology
- Electron Microscopy
- Diagnostic Imaging
Background:
- Electron microscopy (EM) is a powerful tool for ultrastructural analysis.
- Its specific utility in routine myocardial tissue diagnosis warrants re-evaluation.
Purpose of the Study:
- To review and reassess the role of routine electron microscopy in diagnosing myocardial diseases.
- To determine the added diagnostic value of EM compared to light microscopy and clinical data.
Main Methods:
- A nine-year series of 59 myocardial tissue samples were audited.
- Samples underwent blinded ultrastructural review by three authors.
- EM findings were cross-compared with light microscopy and clinical data.
Main Results:
- EM identified amyloid, granulomatous inflammation, and basophilic degeneration, all previously seen on light microscopy.
- One case of possible mitochondrial myopathy was detected.
- 18 cases showed non-specific changes (e.g., glycogen, lipid, mitochondrial accumulation).
Conclusions:
- Routine electron microscopy of myocardial tissue offered minimal additional diagnostic insight.
- Only one case demonstrated unique findings not apparent through other methods.
- Further investigation into non-specific ultrastructural findings is recommended.
Aim:
To review and reassess the role of this department's experience with routine electron microscopy of myocardial tissues.
Methods:
A nine year series of myocardial samples that underwent electron microscopy analysis were audited. Fifty nine samples were derived from 46 male and 13 female subjects with an age range of 15-90 years (mean, 50.6). Forty two samples were endomyocardial specimens, with 13 being derived from explanted hearts, and four from necropsies. Two cases were from transplanted hearts. These were all reviewed in a blinded fashion, by all three authors separately, in terms of the myocardium at the ultrastructural level. Subsequently, the interpretations/diagnoses were cross compared with the light microscopy and clinical data results. [figure: see text]
Results:
Four cases of amyloid were identified; in addition, one case of granulomatous inflammation and one case of basophilic degeneration were seen, although all these had been evident on light microscopy. One case of possible mitochondrial myopathy was found. A total of 18 cases revealed changes of a presumed non-specific type including glycogen, lipid, and mitochondrial accumulations. Varying types of degeneration involving myofibres were seen together with variations in interstitial fibrosis and occasional cytoplasmic inclusions.
Conclusion:
Overall, although interesting, the electron microscopy of myocardial tissue added little to the understanding of the patient's disease, with only one case showing changes not found at light microscopy or with other investigations. Further study might shed light on the "non-specific" ultrastructural findings encountered.