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Persons With Alzheimer's Disease More Likely To Experience Recurring Epileptic Seizures

Clinicians Should Monitor and Treat Seizures in Persons with Dementia

FROM THE ALZHEIMER'S ASSOCIATION INTERNATIONAL CONFERENCE 2019

(PRNewsfoto/Alzheimer's Association)

News provided by

Alzheimer's Association

Jul 15, 2019, 12:30 ET

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LOS ANGELES, July 15, 2019 /PRNewswire/ -- Individuals living with Alzheimer's disease experience epileptic seizures up to six-and-a-half times more often than people without dementia, according to new research reported at the Alzheimer's Association International Conference (AAIC) 2019 in Los Angeles. Also reported at AAIC 2019, persons with dementia are at higher risk of having recurring seizures and of experiencing seizures for the first time at a younger age, compared to people without dementia.

Alzheimer's disease causes death of neurons, and researchers hypothesize this may contribute to abnormal electrical activity in the brain that leads to epileptic seizures.

"There appears to be a mechanism at work that puts people living with dementia at higher risk and recurrence of all types of seizures," said Maria C. Carrillo, Ph.D., chief science officer, Alzheimer's Association. "While we continue our push to find treatments and preventions for Alzheimer's and other dementias, doctors should be aware of how common seizures are in this population to better monitor and treat these individuals."

"At the research level, we need additional studies to understand more about the shared mechanisms between epilepsy and Alzheimer's that might help us better understand the impact seizures have on the brain in order to better treat both seizures and cognitive decline," Carrillo added.

Seizures can be a symptom of epilepsy, but not all people who experience seizures have epilepsy. Seizures indicate a disruption of brain function even though the person may not always lose consciousness. Epilepsy is a nervous system disorder in which brain electrical activity becomes abnormal, causing seizures plus unusual behavior, sensations, and sometimes loss of awareness.

People with Dementia May Experience Many Types of Seizures
Ruby Castilla-Puentes, MD, DrPH, MBA, director, clinical research, neuroscience, Janssen Pharmaceuticals and colleagues Miguel Habeych, MD, MPH at the University of Cincinnati analyzed a large U.S. national managed care database including more than 2.8 million individuals with and without dementia, age 60 and older. In the database, 79,561 persons (2.8%) had a dementia diagnosis. Of that group, 56% were women. The study population was followed from 2005 to 2014.

Study participants with a dementia diagnosis were found to have higher risk of new onset or first-time seizures. Researchers also found that participants with dementia experienced a variety of seizure types. These included:

  • 6.5 times increase risk for seizures where the origin could not be determined.
  • 6 times elevated risk for partial seizures.
  • 5.2 times higher risk for generalized and undifferentiated epilepsy.
  • 4.75 times increased risk for generalized seizures and partial epilepsy.

"There may be many reasons for these higher rates, including the medications used to treat dementia, other medical conditions associated with both seizures and dementia, or a combination of factors," said Castilla-Puentes. "More research is needed to answer that question."

"For right now, these findings reinforce the need for clinicians to be aware of and monitor for seizures to ensure that their patients with dementia receive appropriate treatment," Castilla-Puentes added.

High Recurrence Rates and Potential Negative Consequences of Epilepsy in Dementia
In another study reported at AAIC 2019, analysis of data from the National Alzheimer's Coordinating Center, comprising 20,745 individuals at 34 centers between 2005 and 2016, found that prevalence of active seizures was higher in persons with Alzheimer's than in persons without the disease (1.51% vs. 0.35%). And persons with Alzheimer's disease were also twice as likely to have had a previous seizure (3.14% vs. 1.57%).

The researchers found that the longer the individuals had been living with Alzheimer's, the higher the risk for having a seizure (1.5% at 4.8 years up to 5.4% at 11 years). More than two-thirds (70.4%) of persons with Alzheimer's in the study who experienced a seizure had a second seizure in the next seven-and-a-half months. History of a seizure was associated with younger age of onset of cognitive symptoms (seizures vs. no seizures; 64.7 vs. 70.4 years), more severe memory problems and impaired everyday life skills.

"People with Alzheimer's are at increased risk for seizures, in particular in more advanced stages of the disease, and they have an exceptionally high recurrence risk," said Jonathan Vöglein, M.D., Ludwig-Maximilians-Universität München and the German Center for Neurodegenerative Diseases, Munich, Germany. "The high recurrence risk and potentially negative consequences of seizures suggest that individuals with Alzheimer's should be treated with anti-epileptic drugs after their first seizure."

"It's clearly important to focus on seizures in people with Alzheimer's so that their treatment may be improved. This includes development of anti-epileptic drugs specifically for prevention of seizures in persons living with Alzheimer's," Vöglein added.

About AAIC
The Alzheimer's Association International Conference (AAIC) is the world's largest gathering of researchers from around the world focused on Alzheimer's and other dementias. As a part of the Alzheimer's Association's research program, AAIC serves as a catalyst for generating new knowledge about dementia and fostering a vital, collegial research community.
AAIC 2019 home page:www.alz.org/aaic/

AAIC 2019 newsroom:www.alz.org/aaic/pressroom.asp

About the Alzheimer's Association®
The Alzheimer's Association is the leading voluntary health organization in Alzheimer's care, support and research. Our mission is to eliminate Alzheimer's disease through the advancement of research, to provide and enhance care and support for all affected, and to reduce the risk of dementia through the promotion of brain health. Our vision is a world without Alzheimer's. Visit alz.org or call 800.272.3900.

  • Ruby Castilla-Puentes, MD, DrPH, MBA, et al. Dementia and the Risk of New Onset Seizures: A Cohort Study of a National US Managed Care Database. (Funded by Janssen Neuroscience)
  • Jonathan Vöeglein, MD, et al. Epilepsy in Alzheimer's Disease Is Frequent and Characterized by High Recurrence. (Funded by the German Center for Neurodegenerative Diseases)

SOURCE Alzheimer's Association

Related Links

https://www.alz.org

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