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This is a clinician-written, evidence-based summary aligned to the USMLE Step 2 CK Content Outline. It is intended for medical students preparing for USMLE Step 2 CK. Management reflects current ACC/AHA, USPSTF, and APA guidelines. Always cross-reference with UpToDate, institutional protocols, and clinical judgment.
The Bottom Line
- TIA is transient focal ischemia without infarction on imaging
- Resolved deficits still require urgent stroke evaluation
- MRI DWI distinguishes tissue-negative TIA from completed infarct
- High-risk TIA needs vascular imaging and rhythm assessment
- Minor stroke/high-risk TIA often receives short-course DAPT
Overview
TIA is a warning syndrome caused by temporary ischemia without acute tissue infarction. The older 24-hour definition is less useful than the tissue-based definition. Management is urgent because early recurrent stroke risk is highest in the first 48 hours.
Epidemiology
TIA shares risk factors with stroke: hypertension, diabetes, smoking, atrial fibrillation, carotid stenosis, hyperlipidemia, and prior vascular disease. Mimics include migraine aura, focal seizure, hypoglycemia, syncope, and vestibular disorders.
Clinical Features
Symptoms
Sudden focal deficit that resolves completely
Unilateral weakness, numbness, aphasia, dysarthria, or visual field loss
Amaurosis fugax: transient monocular curtain-like vision loss
Posterior circulation diplopia, dysphagia, ataxia, or vertigo with brainstem signs
Gradually spreading positive symptoms favor migraine aura
Signs
Exam may be normal after symptom resolution
Carotid bruit suggests extracranial carotid atherosclerosis
Irregularly irregular pulse suggests atrial fibrillation
Persistent deficit means stroke until proven otherwise
Retinal embolus supports carotid source
Investigations
First-line
MRI brain with DWIPreferred when available; DWI lesion means infarct
Noncontrast CT headOften first in ED to exclude hemorrhage or mass
CTA/MRA head and neck or carotid duplexEvaluates carotid stenosis, dissection, and intracranial disease
ECG/telemetryDetects atrial fibrillation
Second-line
ABCD2 scoreRisk stratification tool, not a replacement for imaging
CBC, BMP, glucose, lipids, HbA1cEvaluate mimics and vascular risk
EchocardiographyAssesses cardioembolic source when suspected
Specialist
Extended rhythm monitoringFor cryptogenic TIA or suspected paroxysmal AF
Hypercoagulable testingSelected young or recurrent unexplained cases
1
Urgent evaluation
- High-risk TIA should be assessed within 24 hours
- Admit or rapid-access stroke clinic for crescendo TIA, AF, carotid stenosis, or DWI lesion
- Exclude hemorrhage or mimic but do not dismiss resolved symptoms
2
Antithrombotic therapy
- High-risk TIA/minor stroke: aspirin plus clopidogrel short term
- Then continue single antiplatelet therapy
- AF or cardioembolic source: anticoagulation instead of antiplatelet monotherapy
- Avoid indefinite DAPT unless another indication exists
3
Risk factor modification
- High-intensity statin for atherosclerotic disease
- BP control generally to <130/80 after acute period
- Smoking cessation, diabetes control, exercise, diet, sleep apnea treatment
4
Carotid disease
- Symptomatic ipsilateral 70-99% stenosis: carotid endarterectomy if acceptable risk
- Consider 50-69% stenosis in selected patients
- Carotid stenting if surgical risk or anatomy favors it
Complications
- Early stroke: Highest risk in the first 48 hours
- Recurrent TIA: May indicate unstable plaque or severe stenosis
- Bleeding: Risk with DAPT beyond recommended duration
- Missed AF: Requires rhythm monitoring
USMLE Step 2 CK Exam Tips
- 1TIA is not benign even if symptoms resolve
- 2DWI-positive transient symptoms = ischemic stroke
- 3Amaurosis fugax = ipsilateral carotid disease until proven otherwise
- 4ABCD2 is a risk tool, not a diagnostic test
- 5High-risk TIA/minor stroke = short-term aspirin + clopidogrel
- 6AF-related TIA = anticoagulation
- 7Symptomatic carotid stenosis 70-99% = endarterectomy
practicetest your knowledge on transient ischemic attackApply what you've learnt with USMLE Step 2 CK-style questions from the iatroX Q-Bank — neurology and beyond.
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