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Risk factors for the development and rupture of intracranial berry aneurysms
Insights
This study identifies key risk factors for berry aneurysm development and rupture. Hypertension, atherosclerosis, and certain lifestyle choices increase risk, while some conditions may offer protection.
Area of Science:
- Neurology
- Vascular Biology
- Epidemiology
Background:
- Intracranial saccular (berry) aneurysms are a significant cause of cerebrovascular events.
- Understanding risk factors is crucial for prevention and early intervention strategies.
Purpose of the Study:
- To identify and analyze risk factors associated with the development and rupture of intracranial saccular aneurysms.
- To explore the relationship between various clinical, lifestyle, and pathological factors and aneurysm formation/rupture.
Main Methods:
- A case-control study utilizing autopsy subjects.
- Statistical analysis to determine correlations between risk factors and aneurysm presence/rupture.
Main Results:
- Berry aneurysm development is linked to systemic arterial hypertension, cerebral artery atherosclerosis, and Circle of Willis asymmetry.
- Increased risk is associated with headaches, pregnancy-induced hypertension, long-term analgesic use (especially aspirin), and family history of stroke.
- Protective factors include insulin treatment for diabetes, leanness, chronic pancreatitis, malignant tumors, and coronary/renal atherosclerosis.
- Rupture correlates with aneurysm size, multiple aneurysms, analgesic use, ethanol consumption, and fatty liver disease.
- Prostaglandin E synthesis appears to play a role in aneurysm development and rupture.
Conclusions:
- Multiple factors contribute to berry aneurysm development and rupture, including vascular conditions, lifestyle choices, and genetic predispositions.
- The study highlights the complex interplay of factors, potentially involving prostaglandin pathways, in aneurysm pathogenesis.
- Further research into these risk factors may lead to improved preventative measures and treatment strategies for intracranial aneurysms.
Abstract:
Risk factors for the development and rupture of intracranial saccular (berry) aneurysms were identified in a case-control study of autopsy subjects. The development of berry aneurysms was positively correlated with increased frequencies of systemic arterial hypertension (p less than 0.001), cerebral artery atherosclerosis (p less than 0.05), and marked asymmetry of the cerebral vessels comprising the circle of Willis (p less than 0.005). In addition, patients with berry aneurysms more frequently had histories of persistent headache (p less than 0.001), pregnancy-induced hypertension (p less than 0.01), long-term use of analgesics (p less than 0.001), especially aspirin (p less than 0.05), and a family history of stroke (p less than 0.05). Factors associated with a decreased risk of berry aneurysms included treatment with insulin to control diabetes mellitus (p less than 0.005), leanness (p less than 0.05), chronic pancreatitis (p less than 0.001), malignant tumors (p less than 0.001), and moderate or severe coronary or renal atherosclerosis (p less than 0.05). Rupture of berry aneurysms was positively correlated with size (p less than 0.05) and the presence of multiple aneurysms (p less than 0.005), but also with long-term analgesic usage (p less than 0.05), excessive ethanol consumption (p less than 0.01), and fatty metamorphosis of the liver (p less than 0.01). The factors that predispose to rupture of berry aneurysms are interrelated in the sense that several of them are known to cause a decrease in the synthesis of prostaglandin E, whereas one of the factors that appears to be protective has the opposite effect. Marked and abrupt lowering of serum prostaglandin levels would cause dilatation of cerebral vasculature and increased cerebral blood flow; in the setting of hypertension, focal defects in cerebral arteries could develop, leading to the formation and subsequent rupture of berry aneurysms.