Overview
A stroke occurs when blood flow to part of the brain is blocked or when a blood vessel ruptures. Brain injury can begin within minutes. Stroke is an emergency: call 911 immediately, even if symptoms improve. Do not drive yourself, wait for a clinic appointment, or take aspirin unless emergency clinicians advise it, because bleeding must first be excluded.73
The 2026 American Heart Association/American Stroke Association acute ischemic stroke guideline expanded treatment in several important ways: greater use of mobile stroke units where available, refined prehospital destination decisions, broader use of tenecteplase, imaging-selected thrombolysis beyond the traditional window in some patients, thrombectomy for selected larger-core strokes, strong support for thrombectomy in certain basilar-artery occlusions, and the first pediatric interventional recommendations.12
Evidence cutoff: This article reflects U.S. guidance publicly available through August 9, 2026. Emergency treatment depends on exact timing, imaging, disability, bleeding risk, vessel anatomy, age, comorbidities, and local stroke-system capabilities.
Recognizing Stroke: BE-FAST
| Letter | Warning sign |
|---|---|
| B — Balance | Sudden severe imbalance, inability to walk, or loss of coordination |
| E — Eyes | Sudden vision loss, double vision, or a new visual-field defect |
| F — Face | One-sided facial droop or numbness |
| A — Arm | One-sided arm or leg weakness, numbness, or clumsiness |
| S — Speech | Slurred speech, inability to speak, wrong words, or inability to understand |
| T — Time | Call 911 now; note the last time the person was known to be normal |
Other warning signs include sudden confusion, severe unexplained headache, vertigo with inability to stand, collapse, seizure with a new deficit, or sudden loss of consciousness. Posterior-circulation stroke may present with dizziness, double vision, swallowing difficulty, ataxia, or crossed face-and-body symptoms rather than obvious arm weakness.7
Emergency medical services can begin assessment, alert the stroke team, and route the patient according to the local system. In areas with mobile stroke units, brain imaging and thrombolysis may begin before hospital arrival.2
Types of Stroke
Ischemic stroke
An artery is blocked by a clot or severe narrowing. Ischemic stroke is the most common type. The clot may form locally, travel from the heart—often because of atrial fibrillation—or arise from carotid, aortic, or other vascular disease.
Intracerebral hemorrhage
A vessel ruptures within the brain. High blood pressure, cerebral amyloid angiopathy, anticoagulants, vascular malformations, and other causes may contribute. Treatment focuses on blood-pressure management, reversal of anticoagulation when appropriate, neurosurgical or endovascular care in selected cases, and management of pressure and complications.6
Subarachnoid hemorrhage
Bleeding occurs around the brain, often from a ruptured aneurysm. A thunderclap “worst headache of life,” neck stiffness, vomiting, collapse, or altered consciousness requires emergency care.
Transient ischemic attack
A TIA causes temporary stroke-like symptoms without persistent infarction on appropriate evaluation. It is not a “mini problem.” The early risk of stroke can be substantial, and urgent brain and vascular imaging, cardiac evaluation, and prevention are needed.
Emergency Evaluation
The stroke team determines:
- Exact last-known-well time and whether symptoms are disabling
- Blood glucose and vital signs
- Whether bleeding is present on noncontrast CT or other emergency imaging
- Whether a large artery is blocked and whether salvageable tissue may remain
- Current anticoagulants, antiplatelets, recent surgery, bleeding, trauma, pregnancy, and other contraindications
- Whether the deficit could be a seizure, migraine aura, low blood sugar, infection, functional neurological disorder, or another stroke mimic
Stroke mimics are common, but the safest response is still emergency activation. Treatment decisions can be made only after rapid assessment.
Acute Ischemic Stroke Treatment in 2026
Intravenous thrombolysis
For eligible patients with disabling ischemic stroke within 4.5 hours, the 2026 guideline supports either alteplase or tenecteplase. Tenecteplase is given as a single IV bolus and has become an increasingly practical option. Patients with an unknown onset or presentation 4.5–9 hours after last known well may still qualify when advanced imaging shows a favorable pattern.12
A “mild” score does not necessarily mean a nondisabling stroke: isolated aphasia, hemianopia, hand weakness in a surgeon, or gait failure may be profoundly disabling. Conversely, for many patients with minor nondisabling deficits in the early window, dual antiplatelet therapy is favored over thrombolysis because benefit-risk differs.2
Mechanical thrombectomy
Catheter-based clot removal is standard for eligible large-vessel occlusion. The evidence now includes selected patients with larger established infarct cores, and the 2026 guideline strongly recommends thrombectomy for certain basilar-artery occlusions within 24 hours when neurological severity is substantial. Selection remains imaging- and anatomy-dependent.12
Supportive care
Oxygen is used for hypoxemia, not routinely for everyone. Blood pressure and glucose are managed carefully; fever, swallowing safety, seizures, brain swelling, and complications are addressed. Excessively aggressive blood-pressure reduction can be harmful in some ischemic strokes, while hemorrhagic stroke has different targets.16
Hemorrhagic Stroke Treatment
Hemorrhagic stroke is not treated with clot-busting medication. Management may include rapid reversal of anticoagulation, blood-pressure control, neurocritical care, surgery or minimally invasive evacuation in selected intracerebral hemorrhages, aneurysm clipping or coiling for subarachnoid hemorrhage, and treatment of hydrocephalus or elevated intracranial pressure.6
This is why taking aspirin at home for undiagnosed stroke symptoms is unsafe: aspirin may worsen bleeding.
Recovery and Rehabilitation
Recovery begins in the hospital. An interdisciplinary team may include neurology, rehabilitation medicine, nursing, physical therapy, occupational therapy, speech-language pathology, neuropsychology, social work, and nutrition.
- Physical therapy: walking, strength, balance, transfers, spasticity, and fall prevention
- Occupational therapy: dressing, bathing, cooking, vision, arm function, home and work adaptation
- Speech-language therapy: speech, language, cognition, and swallowing
- Neuropsychological and mental-health care: attention, memory, depression, anxiety, emotional lability, and adjustment
- Caregiver and systems planning: home safety, medications, driving, equipment, benefits, and return to work
Recovery is often fastest early but can continue for months or years. Fatigue, depression, shoulder pain, spasticity, seizures, sleep apnea, and cognitive deficits should be treated rather than accepted as inevitable.
Preventing a First or Recurrent Stroke
Prevention depends on stroke mechanism. A generic “blood thinner” plan is not appropriate for everyone.
| Risk or cause | Typical prevention strategy |
|---|---|
| High blood pressure | Accurate measurement, medication when needed, sodium reduction, activity, weight and sleep-apnea management |
| Atrial fibrillation | Oral anticoagulation for many—but not all—patients after individualized bleeding-risk review |
| Large-artery atherosclerosis | Antiplatelet therapy, intensive lipid treatment, risk-factor control; selected carotid procedures |
| Diabetes and metabolic risk | Glucose, blood pressure, lipid, nutrition, weight, and activity management |
| Smoking | Complete cessation with behavioral and medication support |
| Patent foramen ovale | Closure only in carefully selected patients after a cryptogenic-stroke evaluation |
| Sleep apnea | Diagnosis and treatment when present |
Long-term dual antiplatelet therapy is not routine for most stroke survivors because bleeding risk outweighs benefit. Short courses are used in selected minor ischemic stroke or high-risk TIA patients. Anticoagulation is usually used for cardioembolic mechanisms such as atrial fibrillation, not simply because a stroke occurred.5
Primary prevention also includes physical activity, a heart-healthy eating pattern, limiting harmful alcohol, avoiding cocaine and methamphetamine, and addressing social and access barriers that affect risk-factor control.4
What Patients and Families Should Know
- Call 911 for any new focal neurological symptom—even if it disappears.
- Record the last-known-well time.
- Do not drive to the hospital or take aspirin before bleeding has been excluded.
- Wake-up stroke and late presentation may still be treatable.
- Thrombectomy eligibility has expanded, but it remains highly individualized.
- Rehabilitation and prevention should begin early and continue after discharge.
Bottom line: recognition and speed save brain. Modern stroke care can restore blood flow in more patients than ever, but the best outcome still depends on immediate emergency activation and coordinated prevention after the acute event.
At Los Altos Neurology, outpatient stroke care focuses on defining mechanism, optimizing prevention, coordinating rehabilitation, and addressing cognition, mood, sleep, spasticity, and return-to-driving or work decisions.
Questions about your own stroke imaging? Our imaging review service goes through the scans with you — not just the report.
References
- American Heart Association/American Stroke Association. Stroke. 2026. 2026 Guideline for the Early Management of Acute Ischemic Stroke.
- American Heart Association Professional Heart Daily. 2026. Top Things to Know: 2026 Acute Ischemic Stroke Guideline.
- American Heart Association/American Stroke Association. 2026. Key Patient Messages: 2026 Acute Ischemic Stroke Guideline.
- American Heart Association/American Stroke Association. 2024. 2024 Guideline for the Primary Prevention of Stroke.
- American Heart Association/American Stroke Association. 2021. Guideline for Prevention of Stroke in Patients With Stroke and TIA.
- American Heart Association/American Stroke Association. 2022. 2022 Guideline for Spontaneous Intracerebral Hemorrhage.
- American Stroke Association. Stroke Symptoms and Warning Signs.
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