Related Experiment Video
Updated: May 29, 2026
05:32
Transient Middle Cerebral Artery Occlusion Model of Stroke
Published on: August 11, 2023
Early stroke risk and ABCD2 score performance in tissue- vs time-defined TIA: a multicenter study.
M F Giles1, G W Albers, P Amarenco
1Stroke Prevention Research Unit, NIHR Biomedical Research Centre, Oxford University Department of Clinical Neurology, Level 6, West Wing, John Radcliffe Hospital, Oxford OX3 9DU, UK. matthew.giles@clneuro.ox.ac.uk
Neurology
|August 26, 2011
Summary
Stroke risk is high after transient ischemic attack (TIA). A tissue-based definition, rather than time-based, better predicts stroke risk and aids in managing TIA and stroke.
Area of Science:
- Neurology
- Neuroimaging
- Stroke Medicine
Background:
- Transient ischemic attack (TIA) carries a high immediate stroke risk.
- Current prognostic scores like ABCD2 and ABCD3-I aid management.
- The American Stroke Association proposes shifting TIA/stroke definitions from time-based to tissue-based criteria.
Purpose of the Study:
- To investigate the prognosis of TIA using a tissue-based definition.
- To evaluate the performance of the ABCD2 score in TIA subcategorized by tissue status (positive/negative).
- To compare stroke risk based on diffusion-weighted imaging (DWI) or CT imaging findings.
Main Methods:
- A multicenter observational cohort study included 4,574 patients with TIA diagnosed by time-based criteria.
- Data on ABCD2 scores, brain imaging (DWI or CT), and follow-up were collected.
- Stroke rates at 7 and 90 days were analyzed in relation to tissue-positive or tissue-negative TIA events.
- The predictive power of the ABCD2 score was assessed using receiver operator characteristic (ROC) curve analysis.
Main Results:
- Recurrent stroke rates at 7 days were significantly higher in tissue-positive TIA events (7.1% on DWI, 12.8% on CT) compared to tissue-negative events (0.4% on DWI, 3.0% on CT).
- The ABCD2 score demonstrated predictive value in both tissue-positive (AUC=0.68) and tissue-negative (AUC=0.73) TIA groups.
- Patients with low ABCD2 scores in tissue-positive events and high scores in tissue-negative events exhibited similar stroke risks, particularly at 90 days.
Conclusions:
- Findings support the adoption of a tissue-based definition for TIA and stroke.
- A tissue-based approach appears more accurate for prognostic assessment.
- This shift in definition may improve the clinical management of TIA and stroke patients.
Related Concept Videos
01:26Transient Ischemic Attack l: Introduction
A transient ischemic attack (TIA) is a brief episode of neurological dysfunction caused by a temporary, focal reduction in cerebral blood flow. Although symptoms resemble those of an ischemic stroke, the interruption in perfusion is short-lived and does not cause permanent infarction. TIAs are clinically important because they often serve as early warning events for future stroke.Mechanisms of Transient Cerebral IschemiaTransient cerebral ischemia may arise through several mechanisms. One...
01:15Ischemic Stroke l: Introduction
Ischemic stroke is an acute cerebrovascular condition in which blood flow to a brain region is suddenly interrupted, leading to tissue infarction. Neurons depend on continuous oxygen and glucose supply, so even brief reductions in perfusion cause energy failure, ionic imbalance, and irreversible injury. Ischemic strokes are classified into thrombotic and embolic types based on their underlying mechanisms.Thrombotic MechanismsThrombotic stroke develops when a clot forms within a cerebral artery.
01:30Acute Coronary Syndrome III: Diagnostic Studies
Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
01:15Ischemic Stroke ll: Pathophysiology
An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...