science
Study Identifies Five Factors Predicting Stroke Risk After Transient Ischemic Attack Over 10 Years
A systematic review published in Circulation analyzed 28 observational studies involving over 86,000 participants who experienced a transient ischemic attack (TIA). The review found five key factors associated with increased risk of subsequent stroke, including hypertension, smoking, and three specific TIA subtypes.
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A systematic review published in the journal Circulation by the American Heart Association examined long-term stroke risk following a transient ischemic attack (TIA), also known as a mini-stroke. The study served as a follow-up to the prior PERSIST study, which indicated that stroke risk continues beyond the standard 90-day monitoring period after a TIA.
Conducted by researchers based in Canada, the review included 28 observational studies with more than 86,000 participants followed for at least one year post-TIA. The median age of participants was 69, and 57% were men.
The review identified five key factors associated with an elevated risk of subsequent stroke after a TIA: hypertension, smoking, large-artery atherosclerosis subtype, small-vessel occlusion subtype, and cardioembolic subtype. Older age was also linked to higher risk.
These factors were determined through analysis of data from the included studies, highlighting patterns in recurrence over extended periods. The findings suggest that individuals who experience a TIA face an increased chance of another stroke for at least 10 years.
TIA occurs when blood flow to the brain is temporarily interrupted, often serving as a warning sign for a full stroke. Unlike a major stroke, symptoms of a TIA typically resolve within 24 hours, but it indicates underlying vascular issues. The stakes are significant, as subsequent strokes can lead to permanent disability or death, affecting millions worldwide.
In the United States, nearly 90% of adults are at risk for related silent cardiovascular diseases, underscoring the broader public health implications.
The study authors stated that these results can assist physicians in identifying patients with long-term stroke risk, enabling closer monitoring, appropriate treatments, and targeted prevention strategies. Bibhu D. Mohanty, MD, an associate professor of cardiovascular sciences at the University of South Florida Morsani College of Medicine, who was not involved in the research, commented on the findings.
