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Study finds increased risk of dementia after hospitalization for major traumatic brain injury

People who have been hospitalized for a major traumatic brain injury may have a higher risk of developing dementia when compared to people who do not have a traumatic brain injury, according to a new study published in the May 11, 2022, online issue of Neurology®, the medical journal of the American Academy of Neurology. Major traumatic brain injury was defined as having bleeding in the brain and a hospital stay of three or more days. Researchers did not find an increased risk for people who had minor traumatic brain injury, which was defined as a concussion with no more than a one-day hospital stay.

“Traumatic brain injury has been identified as a possible risk factor for dementia, and due to increasing numbers of people living with dementia, it is imperative to identify risk factors that might be modifiable to decrease the number of people who develop dementia in the future,” said study author Rahul Raj MD PhD of the University of Helsinki in Finland. “The goal of our study was to assess the association between traumatic brain injury and dementia while adjusting for other relevant dementia risk factors like high blood pressure, smoking, alcohol consumption, and physical activity.”

For the study, researchers used a Finnish national database that includes health surveys collected every five years. Focusing on a 20-year period, they identified 31,909 people who completed one or more surveys that included details on lifestyle factors such as physical activity, smoking, and alcohol use.

Researchers then looked at national health registries. Of the study group, they identified 288 people hospitalized due to a major traumatic brain injury and 406 hospitalized due to a minor traumatic brain injury who did not have dementia within one year of their injury. A total of 976 people developed dementia over an average 16-year follow-up period.

Of those with a major traumatic brain injury, 27 people, or 9%, developed dementia. Of those with a minor traumatic brain injury, nine people, or 2%, developed dementia. And of those with no traumatic brain injury, 940 people, or 3% developed dementia.

After adjusting for age and sex, researchers found that people who were hospitalized due to a major traumatic brain injury had a 1.5 times greater risk of dementia than those without a traumatic brain injury.

But after further adjustment for other relevant dementia risk factors such as education, smoking, alcohol consumption, physical activity, and high blood pressure, the association weakened. Raj explained that alcohol use and physical activity appeared to play the biggest role in weakening the association.

Researchers found no increased risk of dementia for people hospitalized for minor traumatic brain injury.

“Approximately one in 10 people in our study who had major traumatic brain injury did develop dementia,” said Raj. “Considering that there is no cure for dementia or traumatic brain injury, the results of our study suggest that prevention of other dementia risk factors such as excess alcohol consumption and physical inactivity could possibly reduce the risk of dementia in people with major traumatic brain injury. More research is needed in larger groups of people.”

A limitation of the study was that it included only people hospitalized for traumatic brain injury, so people who did not seek care for a mild traumatic brain injury were not included.

Source: News Release
American Academy of Neurology
May 11, 2022

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