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Aortic dissecting aneurysms: causative factors in 204 subjects
Insights
Aortic dissection pathogenesis remains debated. This study found hypertension, Marfan syndrome, and aortic injuries are linked to dissection, with multiple origins, not a single cause.
Area of Science:
- Cardiovascular Pathology
- Aortic Diseases
- Medical Research
Background:
- The underlying causes of aortic dissecting aneurysms are not fully understood.
- Existing theories on aortic dissection pathogenesis lack universal consensus.
Purpose of the Study:
- To investigate the contributing factors and pathogenetic mechanisms of aortic dissecting aneurysms.
- To compare autopsy findings of patients with aortic dissection to matched controls.
Main Methods:
- Retrospective review of 204 autopsy cases of aortic dissecting aneurysms.
- Comparison with age-, race-, and sex-matched control groups.
- Analysis of gross and histologic findings and associated clinical circumstances.
Main Results:
- Hypertension, Marfan syndrome, and injuries (traumatic, atherosclerotic, inflammatory) to the aortic media are associated with aortic dissection.
- Most spontaneous dissections appear to originate from inner aortic layer tears with intramural cleavage.
- Some dissections result from rupture of branch arteries or vasa vasorum.
Conclusions:
- No single pathogenetic mechanism explains all aortic dissections.
- Multiple factors contribute to the development of aortic dissecting aneurysms.
- Understanding diverse origins is crucial for effective management and prevention.
Abstract:
The pathogenesis of dissecting aneurysms of the aorta is controversial. We reviewed the records of the 204 patients with aortic dissecting aneurysms who underwent autopsy at the John Hopkins Hospital, Baltimore, from 1889 to the present and compared them with age-, race-, and sex-matched controls. The results show that hypertension, Marfan's syndrome, and traumatic, atherosclerotic, or inflammatory injuries of the aortic media are factors associated with dissection. The gross and histologic findings and associated circumstances suggest that most spontaneous aortic dissections originate from tears of the inner layers of the aorta followed by intramural cleavage. In other patients, rupture of the intra-aortic course of branch arteries or vasa vasorum may lead to dissection. Thus, no pathogenetic mechanism is common to all aortic dissections.