For Patients & General Readers
An ischemic stroke, often called a 'brain attack,' happens when blood flow to a part of the brain is blocked, usually by a blood clot. This deprives brain cells of oxygen and nutrients, causing them to die. It's a medical emergency that requires immediate treatment to minimize brain damage and improve recovery.
Clinical Overview
Ischemic stroke is the most common type of stroke, resulting from occlusion of a cerebral artery, leading to focal neurological deficits. Etiologies include large artery atherosclerosis, cardioembolism, small vessel occlusion (lacunar stroke), and cryptogenic causes. Prompt diagnosis and reperfusion therapy are critical to salvage ischemic penumbra and improve functional outcomes.
Clinical Presentation
- Sudden onset of focal neurological deficit
- Symptoms depend on the location and extent of brain infarction
- Often presents with unilateral weakness, sensory loss, or visual disturbances
- May involve speech or language impairment
- Can include altered mental status or severe headache
Signs & Symptoms
Symptoms (Patient-Reported)
- Sudden numbness or weakness in the face, arm, or leg, especially on one side of the body
- Sudden confusion, trouble speaking, or difficulty understanding speech
- Sudden trouble seeing in one or both eyes
- Sudden trouble walking, dizziness, loss of balance, or coordination
- Sudden severe headache with no known cause
Signs (Clinician-Observed)
- Facial droop (ask patient to smile)
- Arm drift (ask patient to hold arms up with eyes closed)
- Speech abnormalities (e.g., slurred speech, inability to speak)
- Abnormal pupillary response
- Altered level of consciousness
Differential Diagnoses
| Condition | Distinguishing Feature |
|---|
| Transient Ischemic Attack (TIA) | Symptoms are transient, typically resolving within minutes to hours, with no evidence of infarction on neuroimaging. |
| Hemorrhagic Stroke | Caused by bleeding into the brain; often associated with sudden severe headache, nausea/vomiting, and may present with focal deficits. |
| Migraine with Aura | Neurological symptoms are usually gradual in onset, transient, and often followed by a headache. |
| Seizure | May cause transient focal neurological deficits (Todd's paralysis) post-ictally, but typically associated with altered consciousness and motor activity. |
| Brain Tumor | Neurological deficits are usually progressive over days to weeks, rather than sudden onset. |
| Metabolic Encephalopathy | Generalized neurological dysfunction rather than focal deficits; often associated with systemic illness. |
Red Flags — Seek Immediate Care
- Sudden onset of neurological deficit
- Facial droop, arm weakness, or speech difficulty (FAST criteria)
- Last known well time is critical for reperfusion therapy eligibility
- Altered mental status or severe headache in the context of acute neurological changes
Key Investigations
- Non-contrast head CT (initial imaging of choice to rule out hemorrhage)
- CT angiography (CTA) or MR angiography (MRA) to identify occluded vessel and assess collateral flow
- MRI brain (especially diffusion-weighted imaging - DWI) for definitive diagnosis and assessment of infarct core and penumbra
- Electrocardiogram (ECG) and Holter monitoring to assess for cardiac arrhythmias (e.g., atrial fibrillation)
- Echocardiogram to evaluate for cardiac sources of embolism
- Carotid duplex ultrasound or CTA/MRA of the neck to assess for carotid stenosis
Management Overview
Management focuses on rapid assessment, stabilization, and reperfusion therapy if indicated within the appropriate time window. This includes intravenous thrombolysis with alteplase for eligible patients and endovascular thrombectomy for large vessel occlusions. Secondary prevention strategies are crucial to reduce recurrence risk.
Disclaimer: This article is for educational purposes only and does not constitute medical advice.
Always consult a qualified healthcare professional for diagnosis and treatment.
TruelyserMD does not replace clinical judgement.