Long-Term Stroke Recurrence after Transient Ischemic Attack: Implications of Etiology

Area of Science:

• Neurology
• Cardiovascular Medicine
• Epidemiology

Background:

• Transient ischemic attack (TIA) is a critical warning sign for future stroke.
• Understanding long-term stroke recurrence (SR) patterns is vital for patient management.
• Etiological classification of TIA is key to predicting recurrence risk.

Purpose of the Study:

• To analyze the long-term characteristics of stroke recurrence (SR) following transient ischemic attack (TIA).
• To investigate SR patterns based on the initial etiological classification of TIA.
• To identify risk factors and outcomes associated with recurrent strokes after TIA.

Main Methods:

• Prospective cohort study of 706 TIA patients followed for a mean of 58.9 months.
• Etiologic subgroup determination using an evidence-based causative classification system.
• Recording of TIA and SR location (right, left, posterior territory) and assessment of disability (modified Rankin Scale).

Main Results:

• Overall SR rate was 17.7% (3.6 per 100 patient-years).
• Higher SR risk observed in unclassified and large-artery atherosclerosis (LAA) etiological subgroups.
• Most SR cases (70.4%) shared the same etiology as the index TIA, with LAA being most frequent; cardioaortic embolism was common in undetermined TIA.
• SR occurred in the same territory in 59.2% of cases, and 65.6% of SR events resulted in disability.

Conclusions:

• Stroke recurrence after TIA predominantly occurs with the same etiology and in the same location.
• Undetermined TIA cases showed a high rate of cardioaortic embolism as a cause for recurrence.
• Over half of stroke recurrences resulted in some level of disability, irrespective of the underlying etiology.