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Thrombosis and acute coronary-artery lesions in sudden cardiac ischemic death
Insights
Sudden cardiac death often involves coronary artery thrombi (blood clots) resulting from plaque fissuring. Identifying these acute arterial lesions is crucial for understanding and preventing fatal ischemic heart events.
Area of Science:
- Cardiovascular Pathology
- Ischemic Heart Disease Research
Background:
- The exact pathological cause of sudden cardiac ischemic death remains debated.
- Understanding the acute arterial lesions is critical for effective intervention.
Purpose of the Study:
- To investigate the nature of pathologic lesions in sudden cardiac ischemic death.
- To determine the prevalence and location of coronary thrombi and plaque fissures.
Main Methods:
- Autopsy examination of 100 subjects who died from ischemic heart disease within six hours.
- Comparison with age-matched controls without coronary thrombi.
- Analysis of thrombus location and association with pre-existing coronary stenosis.
Main Results:
- Coronary thrombi were identified in 74% of sudden cardiac ischemic death cases.
- Plaque fissuring was observed in 21 of 26 cases lacking intraluminal thrombi.
- Thrombi were frequently located in the right coronary artery (47%) and associated with high-grade stenosis.
Conclusions:
- Sudden ischemic cardiac death involves rapidly evolving coronary artery lesions, characterized by plaque fissuring and thrombus formation.
- These findings support the role of antithrombotic therapy in preventing sudden cardiac death.
Abstract:
The nature of the pathologic lesion in sudden cardiac ischemic death is in dispute. Among 100 subjects who died of ischemic heart disease in less than six hours, coronary thrombi were found in 74. There was no difference in incidence between those who died in less than 15 minutes, those who died in 15 to 60 minutes, and those who died after one hour. Among 26 cases without an intraluminal thrombus, plaque fissuring was found in 21; thus, in only 5 cases was no acute arterial lesion demonstrated. No intraluminal thrombi were found in age-matched controls. Forty-eight of the 74 thrombi were found at sites of preexisting high-grade stenosis; 14 were found at points of previous stenosis of less than 50 per cent of the diameter of the lumen. Forty-seven per cent of the thrombi were found in the right coronary artery. Only 30 per cent were found in the left anterior descending coronary artery. The pathologic process in sudden ischemic death involves a rapidly evolving coronary-artery lesion in which plaque fissuring and resultant thrombus formation are present. These findings have implications for the prevention of sudden cardiac death by antithrombotic therapy.