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The risk of stroke following a TIA is greatest in the first month, and remains high for the first year. Having had a TIA, he has about a 5% annual risk of stroke, and about an 8% combined annual risk of stroke, heart attack, or death in the next 5 years.  

TIA Facts

• As many as 20% of patients who have a new stroke retrospectively report having prior TIAs 
• After a TIA, the annual risk of stroke is about 5%(2.3%-6.7%) for the first five years. The risk that such a patient will have a stroke, myocardial infarction, or die decreases to about 8% annually over the same period.
• Risk of stroke is highest during the first month. About 15%-30% of subsequent strokes occur during the first month, and 40%-50% occur during the first year.