D-dimer, magnetic resonance imaging diffusion-weighted imaging, and ABCD2 score for transient ischemic attack risk...

Area of Science:

• Neurology
• Cardiovascular Medicine
• Diagnostic Imaging

Background:

• Transient ischemic attack (TIA) risk stratification is crucial for timely intervention.
• Current risk assessment tools may not capture all high-risk TIA patients.
• The utility of D-dimer (DD) in TIA risk stratification requires further investigation.

Purpose of the Study:

• To evaluate the effectiveness of D-dimer (DD) measurement in improving risk stratification for patients following acute transient ischemic attack (TIA).
• To compare the predictive value of DD with the ABCD(2) score and diffusion-weighted imaging (DWI) in TIA patients.

Main Methods:

• Prospective observational study of 167 acute TIA patients.
• D-dimer (DD) levels measured via enzyme-linked immunosorbent assay.
• Primary outcome: composite of stroke/death within 90 days or identification of high-risk stroke mechanism (e.g., >50% stenosis, cardioembolism).

Main Results:

• The composite end point occurred in 25% of patients.
• ABCD(2) score showed association with outcome (c-statistic 0.63).
• D-dimer (DD) levels did not differ by outcome status (c-statistic 0.57).
• MRI DWI was predictive of outcome (c-statistic 0.76) and improved prediction when added to ABCD(2) score (c-statistic 0.83).

Conclusions:

• Many TIA patients present with high-risk mechanisms or face future stroke/death.
• Increasing ABCD(2) scores correlate with adverse outcomes.
• D-dimer (DD) measurement offers no additional prognostic value beyond existing methods like ABCD(2) score and MRI DWI.