Transient ischemic attack vs Stroke
How to tell Transient ischemic attack and Stroke apart when a board question makes them look alike.
TIA is transient focal deficit without infarction; stroke is neurologic deficit with tissue injury.
Side by side
Transient ischemic attack causes focal neurologic symptoms from transient ischemia without infarction, classically resolving within 24 hours and often much sooner.
Stroke causes persistent neurologic deficit with brain infarction or hemorrhage visible on imaging, or lasting injury even if symptoms partially improve.
Temporary vascular occlusion or hypoperfusion causes reversible neurologic dysfunction without tissue infarction.
Sustained ischemia or bleeding causes tissue injury in a vascular territory.
Normal diffusion-weighted MRI after resolved focal deficits supports TIA; vascular risk factors still require urgent secondary prevention.
Imaging infarct or hemorrhage, persistent deficit, or objective tissue injury supports stroke.
The trap
Symptom resolution does not make the event harmless; imaging and duration/tissue injury decide TIA versus stroke.
Watch it explained
The repair move
For brief neurologic deficits, ask whether tissue injury is present and treat the event as a warning sign.
Try a free question
CoreA patient has sudden aphasia and right arm weakness that fully resolve after 20 minutes. MRI shows no diffusion-restricted infarct. Which diagnosis is most likely?
Show answer and explanation
Answer: A. Transient ischemic attack. Resolved focal deficits without imaging infarct support TIA.
Why the other choices are tempting
- B. Stroke requires tissue injury or persistent deficit in this framing.
- C. Subdural hemorrhage would show extra-axial blood.
- D. Migraine without aura does not explain sudden aphasia/weakness as well as TIA.
- E. Seizure disorder would need seizure or postictal clues.
Flashcards
Tap a card to flip it.
What defines TIA in modern framing?
Transient focal neurologic dysfunction without evidence of infarction defines TIA.
What tissue-injury finding defines stroke rather than TIA?
Persistent neurologic deficit or imaging evidence of infarction or hemorrhage defines stroke.
Quick answers
What is the fastest way to tell Transient ischemic attack from Stroke?
TIA is transient focal deficit without infarction; stroke is neurologic deficit with tissue injury.
What is the key clue for Transient ischemic attack?
Transient ischemic attack causes focal neurologic symptoms from transient ischemia without infarction, classically resolving within 24 hours and often much sooner.
What is the key clue for Stroke?
Stroke causes persistent neurologic deficit with brain infarction or hemorrhage visible on imaging, or lasting injury even if symptoms partially improve.
What is the common trap with Transient ischemic attack vs Stroke?
Symptom resolution does not make the event harmless; imaging and duration/tissue injury decide TIA versus stroke.