Neurology · PANCE / PANRE

Transient Ischemic Attack (TIA)

Written & clinically reviewed by Ryan Busch, PA-C · Updated August 2026 · Report an error

Transient focal neurologic deficit from cerebral ischemia without infarction.

Also known as: TIA, mini-stroke, transient ischemic attack

Overview

Transient episode of neurologic dysfunction caused by focal brain, spinal cord, or retinal ischemia, without acute infarction on imaging (tissue-based definition, AHA 2009). Symptoms typically resolve within 1 hour.

Epidemiology

~240,000 cases/year in the US. 10-15% of TIA patients have a stroke within 3 months — half within the first 48 hours.

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Question 1NeurologyMedium
A 67-year-old man has transient right arm weakness and aphasia lasting 20 minutes with complete resolution. Which of the following complications is he at greatest short-term risk for developing?
  • ACompleted ischemic stroke
  • BChronic subdural hygroma
  • CProgressive motor neuron disease
  • DConvexity subarachnoid hemorrhage
Reveal answer & full explanation
Correct answer: A — Completed ischemic stroke
  • ACompleted ischemic stroke✓
  • BChronic subdural hygroma
  • CProgressive motor neuron disease
  • DConvexity subarachnoid hemorrhage

Why Completed ischemic stroke is correct

  • A TIA is transient focal ischemia without infarction and is the strongest near-term warning for a completed stroke.
  • The highest risk is in the first 48 hours to 7 days, which is why urgent workup and secondary prevention are started.
  • The ABCD2 score and rapid imaging stratify this short-term stroke risk.

Why the others are wrong

  • Chronic subdural hygroma — A hygroma is a slow CSF collection from trauma, not the vascular sequel of transient ischemia (neuro-complication trap).
  • Progressive motor neuron disease — ALS is a degenerative, non-vascular process that does not arise from a transient ischemic event (weakness-buzzword trap).
  • Convexity subarachnoid hemorrhage — A focal SAH is a hemorrhagic mimic of TIA but is not the predicted downstream complication of an ischemic TIA (ischemic-vs-hemorrhagic trap).
Question 2NeurologyMedium
A 68-year-old man comes to the emergency department after a 20-minute episode of right arm weakness and slurred speech that resolved completely 1 hour ago. He has hypertension and type 2 diabetes. His blood pressure is 168/94 mm Hg and pulse is regular. Neurologic examination is now normal, and noncontrast head CT shows no infarction or hemorrhage. His ABCD2 score is 5. Which of the following complications is this patient most likely to develop over the next 90 days?
  • ACompleted ischemic stroke
  • BSubarachnoid hemorrhage
  • CIntracerebral hemorrhage
  • DCerebral venous thrombosis
Reveal answer & full explanation
Correct answer: A — Completed ischemic stroke
  • ACompleted ischemic stroke✓
  • BSubarachnoid hemorrhage
  • CIntracerebral hemorrhage
  • DCerebral venous thrombosis

Why Completed ischemic stroke is correct

  • A TIA is a warning of unstable cerebrovascular disease driven by the same mechanisms (cardioembolism, artery-to-artery embolism, large-vessel stenosis) that produce completed infarction.
  • 10-15% of TIA patients have a stroke within 90 days, and roughly half of those occur within the first 48 hours, making early ischemic stroke the dominant complication.
  • A high ABCD2 score (>=4; this patient scores 5 from age, BP, motor weakness, duration, and diabetes) marks high short-term stroke risk and warrants urgent admission/evaluation plus prompt antiplatelet and high-intensity statin therapy per AHA/ASA secondary-prevention guidelines.

Why the others are wrong

  • Intracerebral hemorrhage — a complication of uncontrolled hypertension, amyloid angiopathy, or anticoagulation, not the expected sequela of an ischemic TIA; the natural progression of a TIA is to ischemic infarction.
  • Subarachnoid hemorrhage — typically results from a ruptured saccular aneurysm and presents with thunderclap headache; it is not a downstream complication of a TIA.
  • Cerebral venous thrombosis — a distinct stroke mechanism affecting the dural sinuses, seen with hypercoagulable states, pregnancy/postpartum, or oral contraceptive use; it is not the arterial process that a TIA predicts.
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Risk factors

  • Same as ischemic stroke: hypertension (strongest), atrial fibrillation, diabetes, dyslipidemia, smoking, carotid stenosis, age, prior stroke/TIA
  • Cardioembolic sources: AFib, recent MI with mural thrombus, valvular disease, endocarditis, PFO

Pathophysiology

Transient occlusion of a cerebral artery by embolus (cardioembolic or artery-to-artery) or transient hemodynamic compromise from severe stenosis. Reperfusion occurs before irreversible cellular injury. The same mechanisms that produce TIA can produce completed stroke — TIA is a warning sign of unstable vascular disease.

Clinical presentation

Symptoms

  • Sudden focal deficit identical to ischemic stroke but resolving — unilateral weakness, sensory loss, aphasia, monocular vision loss (amaurosis fugax), diplopia, vertigo, ataxia
  • Duration usually <1 hour (most <15 min)
  • Complete resolution by definition (tissue-based)

Signs / physical exam

  • Often normal exam by the time of evaluation
  • Carotid bruit, irregular pulse (AFib), murmur (valvular source) clues to etiology

Classic findings

Amaurosis fugax ('curtain coming down over one eye') suggests retinal embolism from ipsilateral carotid stenosis.

Differential diagnosis

  • Completed ischemic stroke — Persistent deficit >24 h or imaging-confirmed infarction — distinguished only after observation and MRI
  • Seizure with postictal weakness — Witnessed convulsion, tongue bite, urinary incontinence, gradual recovery
  • Migraine aura — Slow march of positive symptoms (scintillating scotoma, paresthesias) over minutes, headache follows
  • Hypoglycemia — Fingerstick glucose; diaphoresis, tremor; resolves with glucose
  • Syncope / presyncope — Global rather than focal symptoms; bilateral lower extremity weakness, lightheadedness
  • Vestibular disorders (BPPV, vestibular neuritis) — Isolated vertigo; HINTS exam helpful; sustained nystagmus
  • Peripheral neuropathy / nerve entrapment — Onset gradual, distribution follows peripheral nerve rather than vascular territory

Diagnostic workup

Diagnostic criteria

Transient focal neurologic symptoms with no imaging evidence of infarction. ABCD2 score (Age, BP, Clinical features, Duration, Diabetes) stratifies short-term stroke risk.

Labs

  • Fingerstick glucose, CBC, BMP, lipid panel, A1c, PT/INR
  • ECG (atrial fibrillation, recent MI)

Imaging

  • MRI brain with DWI — most sensitive; up to one-third of clinical 'TIAs' show acute infarction (reclassified as stroke)
  • CT or CTA head and neck — evaluates for stenosis and excludes hemorrhage
  • Carotid duplex if neck CTA not done
  • Transthoracic echo; transesophageal if cardioembolic source suspected and TTE non-diagnostic
  • Prolonged cardiac monitoring (30-day event monitor or implantable loop recorder) for cryptogenic events — CRYSTAL-AF found AFib in ~12.4% at 12 months

Diagnostic algorithm

ABCD2 ComponentPoints
Age ≥601
BP ≥140/90 at presentation1
Clinical: unilateral weakness2
Clinical: speech impairment without weakness1
Duration ≥60 min2
Duration 10-59 min1
Diabetes1
Score 0-3 low / 4-5 moderate / 6-7 high 2-day stroke risk
ABCD2 score for predicting short-term stroke risk after TIA.

Treatment

First-line

  • Aspirin 325 mg loading dose, then 81 mg daily — start immediately
  • Dual antiplatelet therapy (aspirin + clopidogrel) for 21-90 days after high-risk TIA (ABCD2 ≥4) or minor stroke, then aspirin monotherapy (CHANCE, POINT, THALES)
  • High-intensity statin: atorvastatin 80 mg or rosuvastatin 40 mg (SPARCL)
  • Blood pressure control (long-term goal <130/80; do not aggressively lower in acute phase)
  • Anticoagulation (DOAC preferred, warfarin if mechanical valve or moderate-severe mitral stenosis) for AFib

Second-line / adjunct

  • Carotid endarterectomy or stenting for symptomatic ipsilateral stenosis 70-99% — within 2 weeks for maximum benefit (NASCET, ECST)
  • PFO closure in selected younger patients with cryptogenic stroke/TIA (RESPECT, CLOSE, REDUCE)
  • Smoking cessation, diabetes control, weight loss, exercise
  • Treat OSA if present

Complications

  • Completed stroke (10-15% within 90 days; highest in first 48 hours)
  • Cardiovascular events (MI, vascular death)
  • Cognitive decline, vascular dementia from cumulative subclinical infarcts

PANCE pearls

  • ABCD2 score ≥4 = high short-term stroke risk → admit or rapid TIA clinic evaluation.
  • TIA is a medical emergency — the same workup and secondary prevention as stroke, just faster.
  • Amaurosis fugax = ipsilateral carotid disease (or giant cell arteritis in elderly).
  • 'Crescendo TIAs' (multiple within hours/days) carry very high stroke risk — admit for urgent workup.
  • Cryptogenic stroke/TIA in young patient — workup PFO, hypercoagulable state, dissection, vasculitis, drug use.

References

  • AHA/ASA 2021 — 2021 Guideline for the Prevention of Stroke in Patients With Stroke and TIA (Kleindorfer et al., Stroke 2021)
  • POINT Trial — Clopidogrel and Aspirin in Acute Ischemic Stroke and High-Risk TIA (Johnston et al., NEJM 2018)
  • CHANCE Trial — Clopidogrel with Aspirin in Acute Minor Stroke or TIA (Wang et al., NEJM 2013)
  • NASCET — Benefit of Carotid Endarterectomy in Patients with Symptomatic Moderate or Severe Stenosis (NASCET Collaborators, NEJM 1998)

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Commonly confused with

vs Ischemic Stroke

Related Neurology diagnoses

Ischemic StrokeHemorrhagic (Intracerebral) StrokeSubarachnoid Hemorrhage (SAH)Subdural Hematoma (SDH)Epidural Hematoma (EDH)Concussion / Mild Traumatic Brain InjuryMigraineTension-Type HeadacheCluster HeadacheSeizures and EpilepsyStatus EpilepticusMultiple SclerosisGuillain-Barré SyndromeMyasthenia Gravis

Differentials & related conditions

Hypoglycemia

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