Stroke

Stroke
Name	Stroke

Stroke is an acute neurological event caused by sudden loss of blood flow to part of the brain, leading to focal neurological deficits and potential long-term disability. It is a major cause of death and disability worldwide and is managed across emergency systems, hospitals, rehabilitation centers, and public health programs. Major historical figures, clinical trials, and institutions have shaped modern stroke care and policy.

Overview and classification

Stroke is classified chiefly into ischemic and hemorrhagic categories, with ischemic stroke resulting from arterial occlusion and hemorrhagic stroke from bleeding into brain tissue or subarachnoid space. Subtypes include thrombotic stroke, embolic stroke, intracerebral hemorrhage, and subarachnoid hemorrhage; additional categories recognized by specialists include transient ischemic attack and cryptogenic stroke. Classification systems and nomenclature have been influenced by landmark studies, consensus panels, and organizations that develop diagnostic criteria and treatment guidelines.

Signs and symptoms

Typical acute presentations include sudden unilateral weakness or numbness, facial droop, aphasia, dysarthria, visual field loss, dizziness, ataxia, and impaired consciousness. Detailed neurological assessment often references standardized scales and protocols established by emergency medicine, neurology, and stroke societies. Observed deficits prompt urgent activation of stroke pathways linking prehospital services, stroke units, neurosurgery, interventional neuroradiology, and intensive care.

Causes and risk factors

Ischemic events commonly arise from atherosclerotic disease, cardioembolism, small vessel occlusive disease, or arterial dissection; hemorrhagic events most often follow hypertensive arteriopathy, cerebral amyloid angiopathy, vascular malformations, or anticoagulant use. Well-established risk factors include hypertension, atrial fibrillation, diabetes mellitus, hyperlipidemia, smoking, and sedentary behavior, with demographic and social determinants modifying individual risk. Epidemiological transitions, public health initiatives, and health systems influence population-level incidence and outcomes.

Pathophysiology

Acute ischemia triggers a central core of irreversible infarction surrounded by an ischemic penumbra where neurons are salvageable if perfusion is restored; mechanisms include excitotoxicity, ionic imbalance, oxidative stress, inflammation, and apoptosis. Hemorrhagic injury combines mass effect, increased intracranial pressure, and neurotoxicity from blood breakdown products. Cerebral autoregulation, collateral circulation, endothelial function, and the blood–brain barrier are central to injury evolution and response to reperfusion therapies developed through experimental neuroscience, clinical trials, and translational research.

Diagnosis=

Diagnosis relies on rapid clinical assessment and neuroimaging, integrating computed tomography, magnetic resonance imaging, vascular imaging, and ancillary tests to determine subtype and therapeutic options. Laboratory studies, cardiac evaluation, and specialized monitoring support etiologic workup; stroke centers, telemedicine networks, and stroke registries coordinate acute evaluation and quality metrics. Differential diagnosis includes seizures, migraine with aura, hypoglycemia, and conversion disorder, all requiring exclusion before definitive interventions.

Prevention=

Primary and secondary prevention strategies encompass blood pressure control, anticoagulation for selected cardiac conditions, antiplatelet therapy, lipid-lowering treatment, smoking cessation, glycemic management, and lifestyle modification. Screening programs, guideline implementation, and health policy initiatives aim to reduce population burden through risk stratification, vaccine programs where relevant, and management of modifiable exposures. Coordination across primary care, cardiology, neurology, and public health agencies is essential to reduce incidence and recurrence.

Treatment and rehabilitation

Acute treatment priorities include rapid reperfusion for eligible patients via intravenous thrombolysis and endovascular thrombectomy, hemostatic measures and neurosurgical interventions for selected hemorrhages, and comprehensive supportive care to prevent complications. Post-acute management includes multidisciplinary rehabilitation addressing motor function, speech, cognition, and psychosocial needs, delivered in inpatient units, outpatient clinics, and community programs. Long-term secondary prevention integrates pharmacotherapy, device-based interventions, lifestyle support, and follow-up by specialty clinics and primary care networks to reduce recurrent events and improve functional outcomes.

Category:Neurology