Higher ABCD2 score predicts patients most likely to have true transient ischemic attack

Area of Science:

• Neurology
• Emergency Medicine
• Clinical Risk Stratification

Background:

• Emergency department diagnoses of transient ischemic attack (TIA) may include alternative conditions like seizures or migraines.
• The ABCD2 score predicts stroke risk in TIA patients but may also identify true TIA cases versus non-TIA spells.

Purpose of the Study:

• To investigate if high ABCD2 scores in emergency department TIA patients primarily identify true TIA cases.
• To determine if the ABCD2 score's predictive power for stroke risk is influenced by differentiating true TIA from alternative diagnoses.

Main Methods:

• Expert neurologist review of 713 emergency department TIA patient records.
• Classification of spells as true TIA or not, followed by 90-day stroke incidence assessment.
• Calculation of ABCD2 scores and analysis of their relationship with stroke risk using trend tests.

Main Results:

• 90% of reviewed cases were confirmed as true TIA by expert review.
• 90-day stroke risk was significantly higher in true TIA cases (24%) compared to non-TIA cases (1.4%).
• ABCD2 scores were higher in true TIA patients and positively correlated with stroke risk within this group.

Conclusions:

• Higher ABCD2 scores correlate with confirmed TIA diagnoses, partially explaining the score's predictive utility for non-neurologists.
• The ABCD2 score remains predictive of 90-day stroke risk even in patients confirmed to have experienced a true TIA by expert review.