Neurology · PANCE / PANRE

Transient Ischemic Attack (TIA)

Written & clinically reviewed by Ryan Busch, PA-C · Updated October 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. Untreated, 10-15% of TIA patients have a stroke within 3 months — half within the first 48 hours; urgent evaluation and treatment cut this by ~80% (~3-4% at 90 days in TIAregistry.org).

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Question 1NeurologyMedium
A 67-year-old man with hypertension and type 2 diabetes has transient right arm weakness and aphasia lasting 20 minutes with complete resolution. Neurologic examination is now normal and noncontrast head CT shows no hemorrhage or infarction. Which of the following complications is he at greatest short-term risk for developing?
  • ACompleted ischemic stroke
  • BConvexity subarachnoid hemorrhage
  • CAcute myocardial infarction
  • DIntraparenchymal hemorrhage
  • EVascular cognitive impairment
Reveal answer & full explanation
Correct answer: A — Completed ischemic stroke
  • ACompleted ischemic stroke✓
  • BConvexity subarachnoid hemorrhage
  • CAcute myocardial infarction
  • DIntraparenchymal hemorrhage
  • EVascular cognitive impairment

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

  • Vascular cognitive impairment — Accumulated ischemic injury can erode cognition over months to years, but it is not the complication that threatens this patient in the coming days (time-frame trap).
  • Acute myocardial infarction — Shared atherosclerosis makes coronary events an important long-term hazard after a TIA, yet early recurrent cerebral ischemia far outweighs MI risk in the first week (competing-vascular-bed 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).
  • Intraparenchymal hemorrhage — his hypertension is the leading risk factor for spontaneous intracerebral hemorrhage, but a TIA signals ischemic vulnerability, and the event most likely in the coming days is infarction in the same vascular territory rather than a hypertensive bleed (risk-factor trap).
Question 2NeurologyMedium
A 68-year-old man is evaluated in a rapid TIA clinic after a 20-minute episode of right arm weakness and slurred speech that resolved completely. His medical history includes hypertension, type 2 diabetes, and hyperlipidemia, and he has a 30-pack-year smoking history. On examination his neurologic findings are normal. Blood pressure is 162/94 mm Hg, pulse is regular, and carotid duplex shows mild (less than 30%) bilateral plaque. Which of the following is the strongest risk factor for transient ischemic attack and ischemic stroke in this patient?
  • AUntreated hyperlipidemia
  • BActive cigarette smoking
  • CMild carotid artery stenosis
  • DEssential hypertension
  • EType 2 diabetes mellitus
Reveal answer & full explanation
Correct answer: D — Essential hypertension
  • AUntreated hyperlipidemia
  • BActive cigarette smoking
  • CMild carotid artery stenosis
  • DEssential hypertension✓
  • EType 2 diabetes mellitus

Why Essential hypertension is correct

  • Hypertension is the single strongest and most prevalent modifiable risk factor for ischemic stroke and TIA, carrying the highest population-attributable risk among the vascular risk factors.
  • It accelerates large-artery atherosclerosis, small-vessel (lacunar) disease, and cardioembolism, so treating it yields the largest absolute reduction in recurrent events.
  • Per AHA/ASA secondary-prevention guidelines the long-term target is less than 130/80 mm Hg, while avoiding aggressive lowering in the hyperacute phase.

Why the others are wrong

  • Type 2 diabetes mellitus is a genuine independent risk factor that roughly doubles stroke risk, but its relative and population-attributable contribution is smaller than that of hypertension.
  • Untreated hyperlipidemia promotes atherosclerosis and warrants a high-intensity statin, yet it confers weaker relative risk for ischemic stroke than hypertension.
  • Active cigarette smoking is an important modifiable factor that should be stopped, but its individual relative risk is lower than that of hypertension in this patient.
  • Mild carotid artery stenosis — the duplex does show plaque and carotid atherosclerosis is a classic TIA source, but the stroke risk it carries is concentrated in symptomatic stenosis of 50% or more; bilateral plaque narrowing the lumen by less than 30% is managed medically rather than with revascularization and contributes far less risk than his hypertension.

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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; BPPV = brief positional episodes with Dix-Hallpike-provoked fatigable nystagmus; vestibular neuritis = continuous vertigo with unidirectional horizontal nystagmus, where the HINTS exam distinguishes it from posterior circulation stroke
  • 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); ticagrelor + aspirin for 30 days is an alternative (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 for age 18-60 with nonlacunar cryptogenic ischemic stroke and high-risk PFO features (RESPECT, CLOSE, REDUCE)
  • Smoking cessation, diabetes control, weight loss, exercise
  • Treat OSA if present

Complications

  • Completed stroke (10-15% within 90 days if untreated, ~3-4% with urgent treatment; 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

Educational use only. This outline is a study aid for PA students and is not medical advice or a substitute for clinical judgment. FirstPassPA is an independent study tool and is not affiliated with, endorsed by, or sponsored by NCCPA or PAEA. PANCE® and PANRE® are registered trademarks of the National Commission on Certification of Physician Assistants; End of Rotation™ is a program of the Physician Assistant Education Association.