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Transient ischemic attack associated with increased risk of dementia

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Transient ischemic attack associated with increased risk of dementia

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Having a transient ischemic attack (TIA) is associated with an increased risk of developing dementia, according to a new study published in Neurology. The study does not prove that a transient ischemic attack causes dementia; it only shows an association.

A TIA is when blood flow stops to a part of the brain for a short time, causing stroke-like symptoms that go away within a day with no stroke visible on brain scans. It can be a precursor to a full stroke.

"After a transient ischemic attack, there is a well-established increased risk of stroke, but less is known about the risk of dementia," said study author Raed A. Joundi, MD, DPhil, of McMaster University and the Population Health Research Institute in Hamilton, Canada. "In our study, over an average of seven years, one in five people who had a TIA developed dementia."

For the study, researchers looked at two decades of health data in Ontario to identify 113,081 people with an average age of 70 who had a first transient ischemic attack and no prior history of dementia. These participants were matched for age, sex and health factors such as diabetes and blood pressure to people who did not have a stroke or dementia. They were also matched separately to people who had a first stroke.


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