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Histopathological study of cardiac rupture following myocardial infarction with and without thrombolytic therapy
H Kawano1, K Miyauchi, R Okada
1Research Laboratory for Cardiovascular Pathology, Juntendo University School of Medicine, Tokyo.
Insights
Thrombolytic therapy for acute myocardial infarction (MI) may increase cardiac rupture risk. This is due to less necrosis and more surviving myocardium, potentially causing stress and weakness at the rupture site.
Area of Science:
- Cardiovascular Pathology
- Myocardial Infarction Research
Background:
- Cardiac rupture is a severe complication of acute myocardial infarction (MI).
- Thrombolytic therapy is a common treatment for acute MI, but its impact on cardiac rupture characteristics is not fully understood.
Purpose of the Study:
- To investigate the pathological characteristics of cardiac rupture in patients treated with thrombolytic therapy versus those without.
Main Methods:
- Histological examination of left ventricular free wall rupture sites in 10 autopsy patients (4 thrombolytic therapy, 6 control).
- Comparison of myocyte viability, necrosis, degeneration, organization, and hemorrhage at rupture sites.
Main Results:
- Patients receiving thrombolytic therapy showed a significantly lower percentage of necrosis and degeneration at the rupture site.
- Pathological findings included necrosis, neutrophil infiltration, hemorrhage, and absorption processes, with varied prevalence between groups.
Conclusions:
- Thrombolytic therapy may lead to cardiac rupture by reducing the necrotic area, increasing surviving myocardium, and potentially causing weakness due to hemorrhage and absorption.
Abstract:
The characteristics of cardiac rupture associated with thrombolytic therapy for acute myocardial infarction (MI) were studied in the hearts of 10 autopsy patients, 7 men and 3 women aged 41-80 years (mean 59.9 +/- 13.2 years), who died of rupture of the free wall of the left ventricle following acute MI. The site of rupture was examined histologically and the percentage areas of living myocytes, the processes of organization, necrosis and degeneration, and hemorrhage were compared in four patients who received thrombolytic therapy (group R) and six patients without thrombolytic therapy (group N). There were four pathological findings at the site of rupture: necrosis, neutrophil infiltration, hemorrhage, and evidence of the process of absorption. Group R consisted of two patients with hemorrhage, one with absorption, and one with unsuccessful reperfusion and neutrophilic infiltration. Group N included three patients with necrosis, two with neutrophilic infiltration, and one with hemorrhage. The percentage area involved by necrosis and degeneration was significantly lower in group R than in group N. Therefore, local stress produced by more surviving myocardium around the smaller necrosis area and the weakness of myocardium due to hemorrhage and absorption may provoke cardiac rupture in acute MI patients receiving thrombolytic agent.