Stroke: Recognition, Diagnosis, Treatment, Recovery

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Introduction

Stroke is one of the most important neurological emergencies in clinical medicine. It occurs when the normal blood supply to part of the brain is interrupted or when a blood vessel within the brain ruptures and produces bleeding. Because brain tissue depends continuously on oxygen and glucose delivered through the circulation, interruption of cerebral blood flow can cause irreversible neuronal injury within a short period. Stroke may therefore produce sudden weakness, paralysis, speech disturbance, visual impairment, loss of coordination, altered consciousness, cognitive dysfunction, or death.

Stroke is not a single disease but a broad clinical syndrome with different causes, mechanisms, anatomical locations, and treatment strategies. The two major pathological categories are ischemic stroke, caused by arterial obstruction and cerebral ischemia, and hemorrhagic stroke, caused by rupture of a blood vessel and bleeding into or around the brain. A third important condition is the transient ischemic attack (TIA), in which transient neurological dysfunction results from cerebral ischemia without persistent infarction. These conditions can appear clinically similar at presentation, but their emergency management is fundamentally different. For example, a patient with an ischemic stroke may benefit from reperfusion therapy, whereas thrombolytic treatment can be dangerous in a patient with intracranial hemorrhage.

Stroke represents a major global health burden. The World Health Organization reported approximately 11.9 million new strokes and 93.8 million people living with stroke globally in 2021. The major modifiable contributors include hypertension, smoking, unhealthy diet, physical inactivity, obesity, abnormal glucose metabolism, high LDL cholesterol, kidney dysfunction, air pollution, and harmful alcohol use.

The outcome of stroke depends heavily on the speed of recognition and treatment. Modern stroke medicine therefore emphasizes the principle that time is brain. Rapid recognition, emergency transportation, brain imaging, identification of stroke type, and initiation of appropriate therapy can substantially influence neurological recovery.

Definition

A stroke is a sudden neurological deficit caused by a disturbance of cerebral circulation resulting either from ischemia due to vascular occlusion or hemorrhage due to vascular rupture.

In ischemic stroke, an artery supplying the brain becomes obstructed by a thrombus or embolus, reducing cerebral blood flow. If the reduction is severe or prolonged, neurons become dysfunctional and eventually die, producing an area of cerebral infarction.

In hemorrhagic stroke, a blood vessel ruptures and blood accumulates within the brain tissue or surrounding intracranial spaces. The resulting injury is caused not only by direct destruction of brain tissue but also by mass effect, increased intracranial pressure, surrounding edema, impaired cerebral perfusion, and secondary biochemical injury.

A transient ischemic attack produces temporary focal neurological symptoms caused by ischemia without established permanent brain infarction. Although symptoms may resolve completely, a TIA is a major warning sign and requires urgent assessment because it may precede a disabling stroke.

Classification of Stroke

Stroke can broadly be classified into ischemic and hemorrhagic forms.

Ischemic Stroke

Ischemic stroke occurs when a cerebral artery becomes blocked. It accounts for the majority of strokes and may result from thrombosis, embolism, or occlusion of a small penetrating artery.

The major mechanisms include:

• Large-artery atherosclerotic disease
• Cardioembolism
• Small-vessel or lacunar disease
• Arterial dissection
• Hypercoagulable states
• Other less common vascular disorders
• Stroke of undetermined cause

Atherosclerotic plaques may form within major arteries supplying the brain. Plaque rupture can produce local thrombosis or release embolic material that travels distally. Cardioembolic stroke commonly occurs when thrombi form within the heart and subsequently enter the systemic circulation. Atrial fibrillation is an especially important cause because ineffective atrial contraction promotes thrombus formation.

Small-vessel disease affects penetrating arteries supplying deep structures of the brain. Occlusion of these vessels produces lacunar infarcts, which may result in characteristic syndromes such as pure motor hemiparesis, pure sensory stroke, or ataxic hemiparesis.

Hemorrhagic Stroke

Hemorrhagic stroke occurs when a cerebral blood vessel ruptures.

The two principal forms are:

1. Intracerebral hemorrhage (ICH) – bleeding directly into brain parenchyma.
2. Subarachnoid hemorrhage (SAH) – bleeding into the subarachnoid space, commonly associated with rupture of an intracranial aneurysm.

Intracerebral hemorrhage is strongly associated with uncontrolled hypertension, cerebral small-vessel disease, cerebral amyloid angiopathy, and anticoagulant therapy. The AHA/ASA identifies uncontrolled hypertension as a major risk factor for spontaneous ICH.

Subarachnoid hemorrhage has a different clinical pattern and commonly presents with an abrupt, extremely severe headache often described as a “thunderclap” headache. Ruptured intracranial aneurysms are an important cause.

Transient Ischemic Attack

TIA is characterized by transient neurological dysfunction caused by focal brain, spinal cord, or retinal ischemia without persistent infarction.

Symptoms may include temporary weakness, numbness, aphasia, visual disturbance, or imbalance. Resolution of symptoms does not mean the condition is harmless. A TIA indicates significant vascular risk and requires urgent evaluation for possible underlying carotid disease, atrial fibrillation, or other causes.

Causes of Ischemic Stroke

The causes of ischemic stroke can be understood using several clinical classification systems, including the TOAST classification.

Large-Artery Atherosclerosis

Atherosclerosis affects large extracranial or intracranial arteries. Plaques may gradually narrow the arterial lumen or suddenly rupture and cause thrombosis.

Commonly affected vessels include the carotid arteries and major intracranial arteries. An atherosclerotic plaque may also act as a source of artery-to-artery emboli.

Cardioembolism

Cardioembolic stroke occurs when a clot forms in the heart and travels to the cerebral circulation.

Important cardiac causes include:

• Atrial fibrillation
• Recent myocardial infarction
• Left ventricular thrombus
• Cardiomyopathy
• Mechanical heart valves
• Rheumatic mitral stenosis
• Certain intracardiac tumors or structural abnormalities

Atrial fibrillation is particularly important because it may be intermittent and asymptomatic. Consequently, prolonged cardiac monitoring may sometimes be necessary when the cause of stroke remains unexplained.

Small-Vessel Disease

Small penetrating arteries may become diseased because of chronic hypertension, diabetes mellitus, and other vascular risk factors. Occlusion produces small deep infarcts known as lacunar infarctions.

Typical locations include:

• Internal capsule
• Basal ganglia
• Thalamus
• Pons
• Corona radiata

Arterial Dissection

A tear within the arterial wall can allow blood to enter the vessel wall, producing stenosis, occlusion, or thrombus formation. Cervical carotid and vertebral artery dissections can cause ischemic stroke, particularly in younger patients.

Dissection may follow trauma or excessive neck movement, although it can also occur spontaneously.

Hypercoagulable States

Certain conditions increase thrombosis risk. These include some malignancies, antiphospholipid syndrome, inherited thrombophilias, pregnancy-related states, and selected systemic disorders.

In younger patients without conventional risk factors, a broader evaluation may be necessary.

Causes of Hemorrhagic Stroke

The most important cause of spontaneous intracerebral hemorrhage is chronic uncontrolled hypertension.

Hypertension causes structural changes in small penetrating arteries, making them vulnerable to rupture. Deep intracerebral hemorrhages commonly involve the basal ganglia, thalamus, pons, and cerebellum.

Other causes include:

• Cerebral amyloid angiopathy
• Anticoagulant therapy
• Arteriovenous malformations
• Cerebral aneurysms
• Brain tumors
• Coagulopathies
• Hematological disorders
• Sympathomimetic or illicit drug exposure
• Cerebral venous thrombosis
• Vascular malformations

Cerebral amyloid angiopathy is particularly associated with lobar hemorrhage in older adults. It results from deposition of amyloid within the walls of cortical and leptomeningeal vessels.

Risk Factors

Stroke risk factors are divided into modifiable and non-modifiable factors.

Non-Modifiable Risk Factors

Important non-modifiable factors include:

• Increasing age
• Previous stroke or TIA
• Family history
• Genetic predisposition
• Certain congenital vascular disorders
• Sex-related biological factors
• Certain racial and population-associated risks

Age is one of the strongest predictors of stroke, although stroke can occur at any age.

Modifiable Risk Factors

Hypertension is the most important modifiable risk factor for both ischemic and hemorrhagic stroke. Persistent elevation of blood pressure damages vascular endothelium, accelerates atherosclerosis, promotes small-vessel disease, and increases the risk of vessel rupture.

Other major modifiable factors include:

• Cigarette smoking
• Diabetes mellitus
• Dyslipidemia
• Atrial fibrillation
• Obesity
• Physical inactivity
• Unhealthy diet
• Excess dietary sodium
• Excess alcohol consumption
• Chronic kidney disease
• Obstructive sleep apnea
• Certain illicit drugs
• Poorly controlled cardiovascular disease

The WHO identifies hypertension, tobacco use, high LDL cholesterol, unhealthy diet, physical inactivity, high fasting glucose, kidney dysfunction, excess body weight, harmful alcohol use, and air pollution among major contributors to global stroke burden.

Pathophysiology of Ischemic Stroke

The brain has a high metabolic demand and depends almost continuously on adequate cerebral blood flow. When an artery becomes occluded, blood flow to the affected territory falls.

The severity of tissue injury depends on the degree and duration of perfusion failure and the availability of collateral circulation.

Two important zones develop around an ischemic arterial occlusion.

The ischemic core is the region with critically reduced blood flow where irreversible cellular injury occurs rapidly.

Surrounding the core is the ischemic penumbra, where blood flow is reduced but tissue may remain potentially salvageable for a period of time if adequate reperfusion is achieved.

This distinction forms the physiological basis of reperfusion therapy.

At the cellular level, cerebral ischemia causes failure of ATP-dependent ion pumps. Sodium and water enter neurons, producing cellular swelling. Membrane depolarization results in excessive release of excitatory neurotransmitters, particularly glutamate. Excessive glutamate stimulation causes calcium influx and activates destructive intracellular pathways.

Mitochondrial dysfunction, oxidative stress, inflammation, blood-brain barrier disruption, and activation of apoptotic and necrotic pathways contribute to neuronal death.

If blood flow is restored before irreversible injury occurs, viable tissue may recover. If ischemia persists, infarction becomes established.

Pathophysiology of Hemorrhagic Stroke

In intracerebral hemorrhage, rupture of a blood vessel causes blood to accumulate within brain tissue.

The hematoma produces immediate mechanical damage to surrounding neurons and glial cells. As the hematoma expands, it compresses adjacent brain tissue and may obstruct cerebrospinal fluid pathways.

Blood products also trigger inflammatory and toxic responses. Breakdown products of hemoglobin can contribute to oxidative injury and perihematomal inflammation.

Brain edema develops around the hematoma and can increase intracranial pressure. Severe cases may produce herniation, brainstem compression, reduced cerebral perfusion, and death.

Hematoma expansion is an important determinant of outcome. Rapid recognition and appropriate management are therefore essential.

Clinical Features

Stroke usually presents suddenly, although symptoms may evolve over minutes or occasionally longer.

The exact clinical presentation depends on the vascular territory, anatomical structures involved, size of the lesion, and type of stroke.

Common manifestations include:

• Sudden weakness of the face
• Sudden weakness of an arm or leg
• Hemiparesis
• Hemiplegia
• Facial drooping
• Numbness or sensory loss
• Difficulty speaking
• Difficulty understanding speech
• Sudden visual impairment
• Diplopia
• Dizziness
• Loss of balance
• Ataxia
• Difficulty walking
• Sudden severe headache
• Confusion
• Altered consciousness
• Seizures in selected cases

The WHO describes sudden facial weakness, limb weakness or numbness, speech disturbance, visual problems, dizziness, loss of coordination, and severe unexplained headache among important warning signs.

Recognition of Stroke in the Emergency Setting

Rapid recognition is critical because treatment options are highly time dependent.

A simple public recognition approach is FAST:

F – Face: Ask the person to smile. Look for facial drooping.

A – Arms: Ask the person to raise both arms. Look for weakness or drift of one arm.

S – Speech: Ask the person to repeat a simple sentence. Listen for slurring, incorrect words, or inability to speak.

T – Time: If any of these findings are present, emergency medical assistance should be activated immediately.

Additional symptoms involving balance and vision are also important. Some strokes, particularly posterior circulation strokes, may present predominantly with dizziness, ataxia, diplopia, visual disturbance, dysarthria, or impaired consciousness rather than classic facial and arm weakness.

Vascular Territories and Clinical Syndromes

Understanding cerebral vascular anatomy helps clinicians localize the lesion.

Middle Cerebral Artery Stroke

The middle cerebral artery is one of the most commonly affected cerebral arteries.

A dominant-hemisphere MCA stroke may produce:

• Contralateral face and arm weakness
• Contralateral sensory loss
• Aphasia
• Gaze deviation
• Contralateral visual field deficit

A nondominant-hemisphere lesion may produce:

• Contralateral weakness
• Neglect
• Spatial disorientation
• Impaired awareness of the affected side
• Visual field deficits

Anterior Cerebral Artery Stroke

ACA infarction typically affects the medial frontal and parietal regions.

Features may include:

• Contralateral leg-predominant weakness
• Contralateral sensory loss
• Urinary incontinence
• Abulia
• Behavioral changes

Posterior Cerebral Artery Stroke

PCA infarction commonly affects the occipital lobe.

The characteristic manifestation is a contralateral homonymous visual field defect. Dominant-hemisphere involvement may also produce reading difficulty or other higher cortical disturbances.

Brainstem Stroke

Brainstem strokes can be particularly difficult to recognize.

Symptoms may include:

• Diplopia
• Dysarthria
• Dysphagia
• Vertigo
• Ataxia
• Cranial nerve abnormalities
• Contralateral limb weakness
• Altered consciousness

Basilar artery occlusion can be catastrophic because the brainstem contains vital pathways and centers responsible for consciousness, breathing, and cardiovascular regulation.

Cerebellar Stroke

Cerebellar infarction may produce:

• Severe vertigo
• Nausea and vomiting
• Gait ataxia
• Limb ataxia
• Nystagmus
• Dysarthria
• Headache

Large cerebellar infarctions may cause swelling and compression of the brainstem or fourth ventricle, creating a neurological emergency.

Aphasia and Dysarthria

Aphasia is a language disorder caused by dysfunction of dominant cerebral language networks. Patients may have difficulty producing words, understanding language, reading, writing, or repeating speech.

Major patterns include:

• Broca aphasia
• Wernicke aphasia
• Global aphasia
• Conduction aphasia
• Anomic aphasia

Dysarthria is different. It is a motor speech disorder caused by impaired control of the muscles responsible for speech production. A patient with dysarthria may know exactly what they want to say but be unable to articulate words clearly.

Distinguishing aphasia from dysarthria is clinically important because it provides information about lesion localization and severity.

Diagnostic Approach

The diagnosis of stroke requires rapid clinical assessment combined with neuroimaging.

The major objectives of the initial evaluation are to:

1. Confirm that a neurological emergency is present.
2. Determine whether the event is ischemic or hemorrhagic.
3. Establish the time of symptom onset or last known well.
4. Identify the affected vascular territory.
5. Assess stroke severity.
6. Determine eligibility for reperfusion or other acute therapies.
7. Identify the underlying cause.
8. Detect complications.

The first clinical priority is stabilization of airway, breathing, and circulation while simultaneously initiating stroke assessment.

History

The history should be focused and rapid.

Important questions include:

• When was the patient last known to be neurologically normal?
• What was the exact time symptoms were first noticed?
• What symptoms developed?
• Did they develop suddenly or progressively?
• Was there loss of consciousness?
• Was there seizure activity?
• Was there severe headache?
• Has the patient previously had stroke or TIA?
• Is there a history of atrial fibrillation?
• Is the patient taking anticoagulants?
• Is the patient taking antiplatelet medication?
• Does the patient have hypertension?
• Does the patient have diabetes?
• Has there been recent surgery or major bleeding?
• Has there been recent trauma?
• Is there a history of malignancy or clotting disorder?

The last known well time is particularly important because eligibility for acute reperfusion treatment depends partly on time and, in selected patients, advanced imaging.

Neurological Examination

A focused neurological examination should rapidly determine the nature and severity of the deficit.

Important components include:

• Level of consciousness
• Orientation
• Speech
• Language
• Cranial nerves
• Pupillary responses
• Eye movements
• Facial symmetry
• Motor strength
• Muscle tone
• Sensory function
• Coordination
• Gait when safe
• Visual fields
• Neglect
• Reflexes

The National Institutes of Health Stroke Scale (NIHSS) is widely used to quantify neurological impairment in acute ischemic stroke.

It assesses areas including consciousness, gaze, visual fields, facial movement, motor function, sensation, language, dysarthria, and neglect.

A higher NIHSS score generally indicates a more severe neurological deficit, although the score does not capture every clinically important deficit. A patient can have a relatively low NIHSS score while still having a disabling deficit, such as isolated severe aphasia or visual impairment.

Blood Glucose

Blood glucose should be checked promptly because hypoglycemia can mimic stroke.

Severe hyperglycemia may also influence neurological outcomes and requires appropriate management.

The 2026 AHA/ASA acute ischemic stroke guideline specifically notes that intensive glucose control to 80–130 mg/dL is not recommended to improve outcomes and may increase severe hypoglycemia.

Neuroimaging

Brain imaging is essential.

Non-Contrast CT

Non-contrast CT is commonly the first imaging test because it is rapid and highly effective for identifying intracranial hemorrhage.

In early ischemic stroke, the CT scan may initially appear normal. However, subtle signs of early ischemia may be visible.

CT can also identify other causes of acute neurological deterioration, such as mass lesions.

CT Angiography

CT angiography evaluates the cerebral and cervical arteries.

It can identify:

• Large-vessel occlusion
• Carotid stenosis
• Arterial dissection
• Intracranial stenosis
• Other vascular abnormalities

Identification of a large-vessel occlusion is particularly important because the patient may be eligible for endovascular thrombectomy.

CT Perfusion

CT perfusion provides information about cerebral blood flow and tissue viability.

It can help identify potentially salvageable tissue in selected patients, particularly when the time of symptom onset is uncertain or when considering treatment beyond conventional early time windows.

MRI

MRI, particularly diffusion-weighted imaging, is highly sensitive for acute cerebral ischemia.

MRI can detect small infarcts that may be difficult to visualize on CT. However, its availability and speed vary between institutions, so it should not unnecessarily delay emergency treatment when CT-based evaluation is sufficient.

Laboratory Investigations

Laboratory tests are used to identify contributing conditions, treatment risks, and underlying causes.

Common investigations include:

• Complete blood count
• Blood glucose
• Electrolytes
• Renal function tests
• Liver function tests when clinically indicated
• Coagulation profile
• Prothrombin time/INR
• Activated partial thromboplastin time
• Cardiac biomarkers when indicated
• Lipid profile
• HbA1c
• Toxicology testing when appropriate

Laboratory testing should be targeted so that unnecessary investigations do not delay time-sensitive reperfusion therapy.

Electrocardiography and Cardiac Evaluation

Because cardiac disease is an important cause of embolic stroke, cardiovascular assessment is essential.

An ECG may reveal:

• Atrial fibrillation
• Atrial flutter
• Recent myocardial infarction
• Other arrhythmias

If no clear cause is identified, prolonged rhythm monitoring may be needed to detect intermittent atrial fibrillation.

Echocardiography may identify:

• Intracardiac thrombus
• Valvular disease
• Cardiomyopathy
• Structural cardiac abnormalities
• Patent foramen ovale in selected patients

Differential Diagnosis

Several conditions can mimic acute stroke.

Important stroke mimics include:

• Hypoglycemia
• Seizure with postictal weakness
• Migraine with aura
• Brain tumor
• Subdural hematoma
• Encephalopathy
• Functional neurological disorder
• Severe metabolic abnormalities
• Vestibular disorders
• Syncope
• Drug or toxin effects

A stroke mimic should not be assumed simply because symptoms are unusual. Sudden focal neurological deficits require urgent evaluation.

Acute Management of Ischemic Stroke

Management of ischemic stroke is based on rapid restoration of cerebral blood flow when appropriate, prevention of secondary injury, treatment of the underlying cause, and early initiation of supportive care.

The 2026 AHA/ASA guideline continues to emphasize rapid treatment and has expanded several reperfusion recommendations, including use of either alteplase or tenecteplase in appropriate patients within the 4.5-hour thrombolytic window.

Intravenous Thrombolysis

Intravenous thrombolysis aims to dissolve the clot and restore blood flow.

The 2026 guideline endorses either alteplase or tenecteplase for eligible adult patients within the standard 4.5-hour window. Selected patients with unknown onset or later presentation may be considered for thrombolysis using advanced imaging criteria.

Treatment decisions must consider:

• Time from last known well
• Severity and disability of the deficit
• Brain imaging
• Bleeding risk
• Anticoagulant use
• Recent surgery or bleeding
• Blood pressure
• Other contraindications

Thrombolytic treatment should only be administered according to an established stroke protocol by appropriately trained clinicians.

Endovascular Thrombectomy

Mechanical thrombectomy is a major advance in ischemic stroke treatment.

It involves introducing an endovascular device through an arterial access site and mechanically removing the clot from an occluded cerebral artery.

It is primarily used for selected patients with large-vessel occlusion.

The 2026 AHA/ASA guideline supports broader use of endovascular thrombectomy in appropriately selected patients, including some patients with larger ischemic cores. It also provides a strong recommendation for thrombectomy in selected patients with basilar artery occlusion presenting within 24 hours and NIHSS ≥10.

Antiplatelet Therapy

Antiplatelet therapy is an important component of secondary prevention in many patients with ischemic stroke.

Aspirin is commonly used after intracranial hemorrhage has been excluded and when appropriate according to the clinical situation.

In selected patients with minor non-cardioembolic stroke or high-risk TIA, short-term dual antiplatelet therapy may be indicated.

The 2026 AHA/ASA guideline recommends dual antiplatelet therapy rather than thrombolysis for selected patients with non-disabling deficits within the 4.5-hour window, because trials have not demonstrated benefit from thrombolysis in that population.

Anticoagulation

Patients with atrial fibrillation may require anticoagulation for secondary prevention.

However, anticoagulation is not simply started immediately in every acute ischemic stroke patient. The timing depends on factors such as infarct size, neurological severity, hemorrhagic transformation risk, and clinical stability.

The decision should be individualized according to current stroke and anticoagulation guidance.

Blood Pressure Management in Ischemic Stroke

Blood pressure management during acute ischemic stroke requires particular caution.

Blood pressure may be elevated as part of the physiological response to cerebral ischemia. Excessive reduction can potentially decrease perfusion of ischemic brain tissue.

For patients receiving reperfusion therapy, blood pressure must be controlled to the relevant treatment thresholds.

At the same time, unnecessary aggressive lowering should be avoided.

The 2026 AHA/ASA guideline reports that more intensive systolic blood-pressure reduction after intravenous thrombolysis or thrombectomy does not improve functional outcomes and may cause harm in some settings; routine intensive reduction below 140 mmHg after successful reperfusion is therefore not recommended.

Supportive Management

Stroke treatment is not limited to reperfusion therapy.

Supportive management includes:

• Maintaining adequate oxygenation
• Treating fever
• Maintaining appropriate glucose levels
• Managing blood pressure appropriately
• Correcting significant electrolyte abnormalities
• Preventing aspiration
• Maintaining hydration
• Monitoring cardiac rhythm
• Preventing complications of immobility
• Managing urinary retention or incontinence
• Preventing pressure injuries
• Providing appropriate nutrition

Patients should generally be managed in a specialized stroke unit when available because organized multidisciplinary stroke care improves outcomes.

Management of Hemorrhagic Stroke

The management of intracerebral hemorrhage differs fundamentally from ischemic stroke.

The major objectives are to:

• Stabilize the patient
• Control blood pressure appropriately
• Identify and reverse anticoagulation when relevant
• Prevent hematoma expansion
• Manage intracranial pressure and complications
• Identify the underlying vascular cause
• Consider neurosurgical or minimally invasive intervention when appropriate
• Prevent secondary complications
• Begin rehabilitation at the appropriate stage

The AHA/ASA emphasizes specialized multidisciplinary care, appropriate blood pressure management, anticoagulation reversal, and selected surgical or minimally invasive approaches in ICH.

Blood Pressure Control in Intracerebral Hemorrhage

Blood pressure control is a central component of acute ICH management.

The goal is to reduce the risk of hematoma expansion while maintaining adequate cerebral perfusion.

Rapid fluctuations in blood pressure should be avoided. Smooth and sustained control is preferred.

The exact target depends on the clinical situation, initial blood pressure, hematoma characteristics, neurological status, and treatment setting.

Reversal of Anticoagulation

If intracerebral hemorrhage occurs while a patient is receiving anticoagulant therapy, rapid reversal may be required.

The reversal strategy depends on the anticoagulant involved.

Examples include:

• Vitamin K plus prothrombin complex concentrate for warfarin-associated bleeding
• Idarucizumab for dabigatran
• Specific or appropriate reversal strategies for factor Xa inhibitors such as apixaban and rivaroxaban

The AHA/ASA guideline specifically emphasizes urgent reversal of anticoagulation in appropriate ICH patients.

Neurosurgical Management

Some hemorrhagic strokes require neurosurgical intervention.

Potential indications include:

• Cerebellar hemorrhage causing neurological deterioration
• Significant mass effect
• Hydrocephalus
• Brainstem compression
• Selected large supratentorial hemorrhages
• Vascular lesions requiring definitive treatment

Surgical options may include hematoma evacuation, minimally invasive evacuation, external ventricular drainage, or treatment of the underlying aneurysm or vascular malformation.

Treatment decisions depend on hemorrhage location, size, neurological status, age, comorbidities, and the availability of specialized neurosurgical care.

Complications of Stroke

Stroke can affect virtually every major physiological system.

Cerebral Edema

Brain swelling can increase intracranial pressure and cause neurological deterioration.

Large infarctions, particularly malignant MCA infarction, can produce life-threatening edema.

Hemorrhagic Transformation

An ischemic infarct may develop secondary bleeding, particularly after reperfusion or in large infarctions.

The severity ranges from small petechial hemorrhage to a clinically significant hematoma.

Increased Intracranial Pressure

Intracranial pressure may rise because of:

• Cerebral edema
• Hematoma
• Hydrocephalus
• Large infarction

Severe intracranial hypertension may lead to cerebral herniation.

Aspiration Pneumonia

Dysphagia is common after stroke.

If swallowing is impaired, food, liquid, or saliva may enter the airway and cause aspiration pneumonia.

Swallowing assessment is therefore an important component of acute stroke care.

Deep Vein Thrombosis

Hemiparesis and prolonged immobility increase the risk of venous thromboembolism.

Appropriate mechanical and pharmacological prophylaxis should be considered according to bleeding risk and clinical circumstances.

Pressure Injuries

Immobility and impaired sensation increase the risk of pressure ulcers.

Regular repositioning, skin assessment, nutrition, and pressure-relieving strategies are important.

Urinary Complications

Patients may experience:

• Urinary retention
• Incontinence
• Urinary tract infection
• Neurogenic bladder dysfunction

Indwelling urinary catheters should be used only when clinically indicated because unnecessary catheterization increases infection risk.

Seizures

Seizures may occur after stroke, particularly following cortical injury and intracerebral hemorrhage.

Routine prophylactic antiseizure medication is not appropriate for every patient. Treatment is generally guided by clinical seizures, electrographic findings, and individual risk.

Depression and Psychological Problems

Post-stroke depression is common and may significantly interfere with rehabilitation.

Patients may also develop:

• Anxiety
• Emotional lability
• Apathy
• Irritability
• Sleep disturbance
• Cognitive impairment

Psychological assessment should therefore form part of comprehensive stroke rehabilitation.

Dysphagia and Nutritional Management

Dysphagia is an important cause of morbidity after stroke.

Patients should be screened for swallowing impairment before receiving oral food, fluid, or medication when clinically indicated.

If swallowing is unsafe, alternative nutritional and medication routes may be required.

Speech and language therapists play an important role in assessing swallowing function and implementing rehabilitation strategies.

Adequate nutrition is essential because malnutrition can impair wound healing, immune function, muscle strength, and neurological recovery.

Rehabilitation

Stroke rehabilitation begins as soon as the patient is medically stable.

The goal is not simply to restore muscle strength but to maximize independence and quality of life.

A multidisciplinary rehabilitation team may include:

• Neurologists
• Rehabilitation physicians
• Nurses
• Physiotherapists
• Occupational therapists
• Speech and language therapists
• Dietitians
• Psychologists
• Social workers
• Pharmacists
• Stroke coordinators

Physiotherapy

Physiotherapy focuses on:

• Muscle strengthening
• Balance
• Postural control
• Gait training
• Transfer training
• Mobility
• Prevention of contractures
• Functional movement

Occupational Therapy

Occupational therapy helps patients regain independence in activities such as:

• Eating
• Dressing
• Bathing
• Grooming
• Writing
• Household activities
• Work-related tasks

Assistive devices may be introduced when necessary.

Speech and Language Therapy

Speech therapists address:

• Aphasia
• Dysarthria
• Apraxia of speech
• Dysphagia
• Communication strategies

Communication rehabilitation is particularly important because inability to communicate can contribute to social isolation and psychological distress.

Cognitive Impairment After Stroke

Stroke may affect memory, attention, executive function, visuospatial processing, and problem-solving.

Patients may experience difficulty concentrating, planning tasks, remembering information, or performing previously familiar activities.

Cognitive assessment helps determine rehabilitation needs and can guide family education.

Post-Stroke Spasticity

Spasticity develops because of disruption of descending motor pathways.

It may cause:

• Increased muscle tone
• Abnormal posture
• Pain
• Contractures
• Difficulty walking
• Difficulty using the affected arm

Management can include stretching, physiotherapy, positioning, splinting, and selected pharmacological or injection-based treatments.

Secondary Prevention

After a stroke or TIA, preventing another vascular event becomes a major priority.

Secondary prevention is individualized according to the underlying mechanism.

Important measures include:

• Blood pressure control
• Diabetes management
• Lipid lowering
• Smoking cessation
• Regular physical activity
• Weight management
• Healthy diet
• Appropriate antiplatelet therapy
• Anticoagulation when indicated for cardioembolic disease
• Management of carotid disease when appropriate
• Treatment of atrial fibrillation
• Medication adherence

Identifying the cause of the initial stroke is essential because secondary prevention differs according to mechanism.

Management of Hypertension

Long-term blood pressure control is one of the most effective strategies for reducing recurrent stroke risk.

Patients should receive an individualized treatment plan that includes lifestyle modification and antihypertensive medication when indicated.

Common antihypertensive drug classes include:

• ACE inhibitors
• Angiotensin receptor blockers
• Calcium-channel blockers
• Thiazide-type diuretics
• Beta-blockers in selected cardiovascular indications

Medication selection depends on the patient's age, comorbidities, kidney function, cardiovascular status, and other factors.

Lipid Management

Dyslipidemia contributes to atherosclerotic vascular disease.

Statins are commonly used for secondary prevention in patients with ischemic stroke associated with atherosclerotic disease or other appropriate indications.

Lipid management should be combined with dietary modification, physical activity, weight control, and other vascular risk reduction strategies.

Diabetes Management

Diabetes accelerates vascular disease and increases the risk of stroke recurrence.

Management includes:

• Glycemic monitoring
• Individualized glucose-lowering therapy
• Healthy dietary patterns
• Physical activity
• Weight management
• Blood pressure control
• Lipid management

The treatment goal should be individualized rather than based on an excessively aggressive glucose target.

Smoking Cessation

Smoking damages vascular endothelium, increases thrombosis risk, accelerates atherosclerosis, and increases stroke risk.

Complete smoking cessation is strongly preferable to merely reducing the number of cigarettes.

Patients may benefit from behavioral counseling and evidence-based smoking-cessation pharmacotherapy.

Diet and Physical Activity

A healthy diet can reduce several vascular risk factors simultaneously.

Important dietary principles include:

• Increased vegetables and fruits
• Whole grains
• Legumes
• Appropriate protein sources
• Reduced sodium
• Reduced saturated fat
• Reduced trans fat
• Limited highly processed foods
• Appropriate caloric intake

Regular physical activity improves cardiovascular fitness, blood pressure, glucose regulation, lipid profile, and weight control.

Carotid Artery Disease

Significant carotid atherosclerotic disease can cause embolic or hemodynamic ischemic stroke.

Evaluation may involve:

• Carotid ultrasound
• CT angiography
• MR angiography
• Conventional angiography in selected situations

Some patients with symptomatic significant carotid stenosis may benefit from carotid revascularization, depending on the degree of stenosis, timing, anatomy, surgical risk, and overall clinical status.

Atrial Fibrillation and Stroke

Atrial fibrillation is a major cause of cardioembolic stroke.

Because atrial contraction is ineffective, blood can stagnate within the atria, particularly the left atrial appendage. Thrombus formation may occur and later embolize to the cerebral circulation.

Stroke prevention in atrial fibrillation commonly involves anticoagulation when the patient's thromboembolic risk justifies it and bleeding risk is acceptable.

The choice and timing of anticoagulation require individualized assessment.

Prognosis

Stroke prognosis varies considerably.

Factors influencing outcome include:

• Stroke type
• Infarct or hematoma size
• Location
• Initial neurological severity
• Age
• Pre-stroke functional status
• Time to treatment
• Presence of large-vessel occlusion
• Development of complications
• Quality of rehabilitation
• Comorbid diseases
• Social support

Early reperfusion can dramatically alter outcomes in appropriately selected ischemic stroke patients. Similarly, rapid control of hematoma expansion and specialized care can influence outcomes after hemorrhagic stroke.

Recovery is often fastest during the first weeks and months, but neurological improvement can continue for much longer. Rehabilitation should therefore be viewed as a continuing process rather than a short hospital-based intervention.

Prognostic Factors

A favorable prognosis is associated with:

• Mild initial neurological deficit
• Early successful reperfusion when indicated
• Small infarct size
• Absence of major complications
• Preserved consciousness
• Good pre-stroke functional status
• Early rehabilitation
• Strong family and social support

Poor prognostic factors include:

• Large infarction
• Large intracerebral hemorrhage
• Reduced consciousness
• Brainstem involvement
• Significant cerebral edema
• Hematoma expansion
• Severe neurological deficit
• Aspiration pneumonia
• Advanced comorbidity
• Delayed treatment

However, individual outcomes can differ substantially, and early severity should not automatically be interpreted as a fixed prediction of long-term recovery.

Stroke Prevention

Stroke prevention is divided into primary and secondary prevention.

Primary prevention aims to prevent a first stroke.

Secondary prevention aims to prevent recurrence after a stroke or TIA.

The most important preventive strategy at the population level is identification and control of vascular risk factors.

Blood pressure control is particularly important. Smoking cessation, healthy diet, physical activity, appropriate weight management, diabetes control, lipid management, and appropriate treatment of atrial fibrillation also play major roles.

WHO emphasizes that many of the factors responsible for global stroke burden are modifiable, making prevention a central component of stroke medicine.

Stroke in Younger Adults

Although stroke becomes more common with increasing age, it can occur in young adults.

When stroke occurs in a younger patient, clinicians may need to consider causes that are less prominent in older populations, including:

• Arterial dissection
• Congenital heart disease
• Patent foramen ovale
• Hypercoagulable disorders
• Autoimmune disease
• Genetic disorders
• Certain infections
• Illicit drug exposure
• Pregnancy-related conditions

A comprehensive evaluation is particularly important when conventional vascular risk factors are absent.

Stroke in Women

Women have several unique considerations in stroke medicine.

Pregnancy and the postpartum period can alter thrombotic and vascular risk. Conditions such as hypertensive disorders of pregnancy can increase the risk of cerebrovascular events.

Women may also experience stroke at older ages and may have greater disability because of differences in age at stroke, comorbidity, and social factors.

Recognition of symptoms and rapid access to emergency care remain essential.

Pediatric Stroke

Stroke can also occur in children, although its causes differ substantially from adult stroke.

Potential causes include:

• Congenital heart disease
• Cerebral arteriopathy
• Arterial dissection
• Sickle cell disease
• Infection
• Trauma
• Genetic disorders
• Metabolic disorders
• Thrombophilia

The 2026 AHA/ASA acute ischemic stroke guideline includes, for the first time, recommendations addressing pediatric acute ischemic stroke, including selected thrombolysis and endovascular treatment considerations.

Importance of Stroke Units

Specialized stroke units provide coordinated care involving physicians, nurses, therapists, pharmacists, and other healthcare professionals.

Stroke-unit care facilitates:

• Neurological monitoring
• Early complication detection
• Dysphagia assessment
• Appropriate blood pressure management
• Early mobilization when safe
• Prevention of complications
• Rehabilitation planning
• Secondary prevention
• Patient and family education

Specialized stroke care is associated with better outcomes than uncoordinated general medical care.

Patient and Family Education

Education is an essential part of stroke management.

Patients and caregivers should understand:

• The type of stroke
• The likely cause
• Medication purpose
• Warning signs of recurrence
• Blood pressure targets
• Lifestyle modifications
• Rehabilitation exercises
• Swallowing precautions
• Fall prevention
• Follow-up requirements

Families should understand that sudden recurrence of neurological symptoms requires immediate emergency assessment rather than waiting for symptoms to improve.

Emergency Warning Signs Requiring Immediate Action

Any sudden onset of neurological symptoms should be treated seriously.

Emergency warning signs include:

• Sudden facial drooping
• Sudden weakness or numbness of one side
• Sudden difficulty speaking
• Sudden inability to understand speech
• Sudden visual loss
• Sudden severe dizziness or loss of balance
• Sudden severe unexplained headache
• Sudden confusion
• Sudden loss of consciousness

A patient should not be allowed to “sleep it off” or wait to see whether symptoms resolve.

Even when symptoms disappear completely, a TIA may have occurred and urgent medical assessment is still required.

Current Advances in Acute Stroke Treatment

Stroke medicine continues to evolve rapidly.

The 2026 AHA/ASA acute ischemic stroke guideline has expanded the evidence base for thrombolysis and thrombectomy. It endorses either alteplase or tenecteplase in eligible patients within the 4.5-hour window, supports selected extended-window thrombolysis based on advanced imaging, and broadens the populations that may benefit from endovascular thrombectomy.

The guideline also emphasizes improving prehospital systems, including the potential role of mobile stroke units and optimized transport pathways to thrombectomy-capable centers.

These developments reflect a broader change in stroke medicine: treatment decisions increasingly depend not simply on the clock but also on the patient's neurological deficit, vascular anatomy, tissue viability, imaging findings, and availability of rapid specialized care.

Stroke as a Medical Emergency

The central principle of acute stroke care is rapid recognition followed by rapid treatment.

Every minute of untreated cerebral ischemia can result in additional neuronal injury. However, modern stroke treatment has demonstrated that meaningful recovery may still be possible even in selected patients presenting later than traditional treatment windows when advanced imaging demonstrates viable brain tissue.

For this reason, the correct response to suspected stroke is not to determine whether the symptoms seem severe enough to justify emergency care. Any sudden focal neurological deficit should trigger immediate emergency evaluation.

The distinction between ischemic and hemorrhagic stroke must be established rapidly because treatments that benefit one type may harm the other.

Integrated Approach to Stroke Care

Successful stroke management extends from the first recognition of symptoms through emergency treatment, inpatient care, rehabilitation, discharge planning, and lifelong prevention.

The acute phase focuses on stabilizing the patient, determining stroke type, identifying treatment eligibility, restoring perfusion when appropriate, controlling bleeding when present, and preventing secondary brain injury.

The subacute phase emphasizes prevention of complications, swallowing and nutritional assessment, mobilization, communication, functional recovery, and identification of the stroke mechanism.

The long-term phase focuses on rehabilitation, prevention of recurrent stroke, medication adherence, cardiovascular risk reduction, psychological support, return to social and occupational activities, and continued follow-up.

Stroke therefore requires much more than treating the initial neurological event. It requires coordinated care across emergency medicine, neurology, radiology, neurointervention, neurosurgery, nursing, rehabilitation, pharmacy, primary care, and the patient's family.

The ultimate goal of stroke medicine is to preserve threatened brain tissue during the emergency, minimize permanent neurological disability, restore functional independence, prevent complications, and reduce the risk of another cerebrovascular event.