Nav: Home

Brain volume may help predict who will develop dementia with lewy bodies

November 02, 2016

MINNEAPOLIS - A lack of shrinkage in the area of the brain responsible for memory may be a sign that people with thinking and memory problems may go on to develop dementia with Lewy bodies rather than Alzheimer's disease, according to a new study published in the November 2, 2016, online issue of Neurology®, a medical journal of the American Academy of Neurology. Shrinkage in this hippocampus area of the brain is an early sign of Alzheimer's disease.

Dementia with Lewy bodies is a common form of dementia. Because it has many symptoms in common with Alzheimer's and Parkinson's disease, it can be difficult to diagnose. It can include movement problems, sleep disorders and hallucinations.

"Being able to identify people who are at risk for dementia with Lewy bodies is important so they can receive the correct treatments early on," said study author Kejal Kantarci, MD, MS, of the Mayo Clinic in Rochester, Minn., and a member of the American Academy of Neurology. "Early diagnosis also helps doctors know what drugs to avoid--up to 50 percent of people with dementia with Lewy bodies have severe reactions to antipsychotic drugs."

For the study, 160 people with thinking and memory problems, called mild cognitive impairment, had brain MRI scans at the start of the study to measure the size of the hippocampus. They also had yearly tests for an average of two years. During that time, 61 people, or 38 percent, developed Alzheimer's disease and 20 people, or 13 percent, progressed to probable dementia with Lewy bodies. It is called probable dementia with Lewy bodies because the disease can be diagnosed definitively only by an autopsy after death.

The people who had no shrinkage in the hippocampus were 5.8 times more likely to develop probable dementia with Lewy bodies than those who had hippocampal shrinkage. A total of 17 out of the 20, or 85 percent, of people who developed dementia with Lewy bodies had a normal hippocampus volume; while 37 of the 61, or 61 percent, of people who developed Alzheimer's disease had shrinkage in the hippocampus.

The relationship was even stronger when researchers looked only at people whose thinking problems did not include memory issues. Dementia with Lewy bodies does not always affect memory; thinking skills that are affected usually include attention, problem solving, and the ability to interpret visual information.

Kantarci noted that diagnosis of dementia with Lewy bodies and Alzheimer's disease can also be difficult because some people have signs of both diseases in their brains. She said this research should be confirmed with studies that use autopsies for final diagnoses.
-end-
The study was supported by the National Institutes of Health, Mangurian Foundation and Robert H. and Clarice Smith and Abigail Van Buren Alzheimer's Disease Research Program.

To learn more about dementia, visit http://www.aan.com/patients.

The American Academy of Neurology is the world's largest association of neurologists and neuroscience professionals, with 30,000 members. The AAN is dedicated to promoting the highest quality patient-centered neurologic care. A neurologist is a doctor with specialized training in diagnosing, treating and managing disorders of the brain and nervous system such as Alzheimer's disease, stroke, migraine, multiple sclerosis, concussion, Parkinson's disease and epilepsy.

For more information about the American Academy of Neurology, visit http://www.aan.com or find us on Facebook, Twitter, LinkedIn and YouTube.

American Academy of Neurology

Related Dementia Articles:

Flies the key to studying the causes of dementia
A research team from the University of Plymouth, University of Southampton and the Alexander Fleming Biomedical Sciences Research Center, Vari, Greece, have studied two structurally-similar proteins in the adult brain and have found that they play distinct roles in the development of dementia.
Stroke prevention may also reduce dementia
Ontario's stroke prevention strategy appears to have had an unexpected, beneficial side effect: a reduction also in the incidence of dementia among older seniors.
Dementia: The right to rehabilitation
Rehabilitation is important for people with dementia as it is for people with physical disabilities, according to a leading dementia expert.
One in 4 elderly Australian women have dementia
At least a quarter of Australian women over 70 will develop dementia according to University of Queensland researchers.
Rural dementia -- we need to talk
Research carried out by Plymouth University into the experience of dementia in farming and farming families, and its impact on their businesses and home lives, has identified four areas of concern which need to be addressed if dementia in the countryside is to be managed.
Women with dementia receive less medical attention
Women with dementia have fewer visits to the GP, receive less health monitoring and take more potentially harmful medication than men with dementia, new UCL research reveals.
Dementia on the downslide, especially among people with more education
In a hopeful sign for the health of the nation's brains, the percentage of American seniors with dementia is dropping, a new study finds.
New study suggests rethink of dementia causes
University of Adelaide researchers have developed a new theory for the causes of dementia and other neurodegenerative diseases, involving an out-of-control immune system.
Bleeding stroke associated with onset of dementia
Bleeding within the brain, or intracerebral hemorrhage, was associated with a high risk of developing dementia post stroke, according to research presented at the American Stroke Association's International Stroke Conference 2016.
Dementia: New insights into causes of loss of orientation
The University of Exeter Medical School led two studies, each of which moves us a step closer to understanding the onset of dementia, and potentially to paving the way for future therapies.

Related Dementia Reading:

Best Science Podcasts 2019

We have hand picked the best science podcasts for 2019. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

Setbacks
Failure can feel lonely and final. But can we learn from failure, even reframe it, to feel more like a temporary setback? This hour, TED speakers on changing a crushing defeat into a stepping stone. Guests include entrepreneur Leticia Gasca, psychology professor Alison Ledgerwood, astronomer Phil Plait, former professional athlete Charly Haversat, and UPS training manager Jon Bowers.
Now Playing: Science for the People

#524 The Human Network
What does a network of humans look like and how does it work? How does information spread? How do decisions and opinions spread? What gets distorted as it moves through the network and why? This week we dig into the ins and outs of human networks with Matthew Jackson, Professor of Economics at Stanford University and author of the book "The Human Network: How Your Social Position Determines Your Power, Beliefs, and Behaviours".