Not So Transient?: A Narrative Review on Cognitive Impairment After Transient Ischemic Attack

Area of Science:

• Neurology
• Neuroscience
• Cognitive Science

Background:

• Transient ischemic attack (TIA) is traditionally considered a transient neurological event without lasting deficits.
• Emerging evidence suggests TIA may be linked to persistent cognitive dysfunction, a less recognized sequela compared to stroke.
• Cognitive impairment is a known complication of ischemic stroke, but its impact after TIA requires further elucidation.

Purpose of the Study:

• To review the existing literature on cognitive function following TIA.
• To summarize proposed pathophysiological mechanisms for cognitive impairment post-TIA.
• To identify future research directions in TIA-related cognitive dysfunction.

Main Methods:

• A literature search was conducted focusing on observational studies examining cognitive function after TIA.
• The review synthesized findings from studies comparing cognitive impairment rates in TIA patients versus healthy controls.
• Recent literature on underlying pathophysiological mechanisms was also summarized.

Main Results:

• A consistent body of literature suggests higher rates of cognitive impairment in individuals who have experienced a TIA compared to healthy controls.
• However, included studies exhibit heterogeneity in design and analysis, limiting definitive conclusions.
• The review highlights proposed pathophysiological pathways contributing to cognitive deficits after TIA.

Conclusions:

• TIA may be associated with a higher prevalence of cognitive impairment than previously recognized.
• Further research is needed to clarify the extent, mechanisms, and clinical relevance of cognitive dysfunction after TIA.
• Standardized methodologies are required for future studies to overcome current limitations.