Stroke: causes and clinical features.

Area of Science:

• Neurology
• Vascular Medicine
• Public Health

Background:

• Stroke is a major global cause of death and disability, characterized by acute neurological deficits from central nervous system vascular injury.
• It encompasses both ischemic (85%) and hemorrhagic (15%) types, each with distinct underlying causes and risk factors.
• Hypertension stands out as the primary modifiable risk factor, influencing stroke incidence across various subtypes.

Purpose of the Study:

• To elucidate the diverse etiologies and mechanisms of stroke, encompassing both ischemic and hemorrhagic types.
• To highlight the critical role of vascular and cerebral anatomy in stroke localization and understanding.
• To emphasize the importance of this knowledge in guiding acute management, investigation, and secondary prevention strategies.

Main Methods:

• Review of existing literature on stroke classification, risk factors, and underlying pathologies.
• Analysis of the differential causes of ischemic stroke (small vessel disease, cardioembolism, large artery atherosclerosis, dissection) and hemorrhagic stroke (hypertensive arteriopathy, cerebral amyloid angiopathy, macrovascular lesions).
• Emphasis on the correlation between vascular/cerebral anatomy and stroke presentation.

Main Results:

• Ischemic strokes predominantly stem from arteriolosclerosis, cardioembolism, and athero-thromboembolism, with extracranial dissection noted in younger patients.
• Intracerebral hemorrhages are often linked to hypertensive arteriopathy (deep) or cerebral amyloid angiopathy (lobar), with macrovascular lesions being significant in younger individuals.
• Accurate anatomical localization is crucial for determining stroke mechanisms and guiding subsequent clinical decisions.

Conclusions:

• Stroke is a complex syndrome with multifactorial causes requiring a nuanced understanding of vascular and cerebral anatomy.
• Identifying specific stroke mechanisms, including the role of hypertension and vessel pathologies, is essential for targeted management and prevention.
• Knowledge of anatomy and etiology informs effective acute care, diagnostic workups, and long-term secondary prevention strategies to reduce mortality and disability.