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Presence of poorly stained myocytes in acute myocarditis predicts improvement in cardiac function
A Sakai1, M Fukunami, T Nagareda
1Division of Cardiology, Osaka Prefectural Hospital.
Insights
Histological findings in acute myocarditis predict long-term heart function. Poorly stained myocytes in biopsies correlate with improved ejection fraction, aiding hemodynamic recovery prediction in myocarditis patients.
Area of Science:
- Cardiology
- Pathology
- Biomedical Engineering
Background:
- Myocarditis, an inflammation of the heart muscle, can lead to chronic heart dysfunction.
- Predicting long-term hemodynamic status in myocarditis patients is crucial for effective management.
- Histological evaluation of myocardial tissue may offer prognostic insights.
Purpose of the Study:
- To investigate the correlation between acute-phase histological findings in myocarditis and the chronic-phase hemodynamic state.
- To determine if myocyte staining characteristics predict ejection fraction recovery in myocarditis patients.
Main Methods:
- Retrospective analysis of 20 myocarditis patients followed for at least 1 year with echocardiography.
- Endomyocardial biopsy samples analyzed using Azan-Mallory staining to categorize myocytes as well-stained or poorly stained.
- Point counting method used to quantify the fraction of each myocyte type.
Main Results:
- A significant positive correlation was found between the fraction of poorly stained myocytes and ejection fraction improvement within 1 year (r = 0.46, p < 0.05).
- A significant negative correlation was observed between the ejection fraction at biopsy and the volume fraction of well-stained myocytes (r = -0.64, p < 0.01).
Conclusions:
- Myocyte staining characteristics in acute-phase endomyocardial biopsies may serve as a predictive marker for hemodynamic recovery in myocarditis.
- Histological assessment of myocyte integrity offers valuable prognostic information for managing myocarditis patients.
Abstract:
Histological findings in the acute phase of myocarditis were evaluated as a prediction of hemodynamic state in the chronic phase in 20 patients with clinical and pathological diagnoses of myocarditis who were followed up with echocardiography for at least 1 year. Endomyocardial biopsy samples were obtained from the left ventricle within 1 year of the onset of symptoms. Azan-Mallory staining was performed on the myocytes, which were categorized as either well stained or poorly stained. The point counting method was used to determine the fraction of each type. The improvement in ejection fraction within 1 year correlated significantly with the fraction of poorly stained myocytes (r = 0.46, p < 0.05). The ejection fraction at biopsy was negatively correlated with the volume fraction of well stained myocytes (r = -0.64, p < 0.01). The staining condition of myocytes may be useful in predicting the hemodynamic recovery of patients with myocarditis.