Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Simple test predicts 6-year risk of dementia

11.06.2007
Risk factors: Age of 70 or older, poor scores on two simple cognitive tests, slow physical function on everyday tasks, history of coronary artery bypass surgery, body mass index of less than 18, current non-consumption of alcohol

A simple test that can be given by any physician predicts a person’s risk for developing dementia within six years with 87 percent accuracy, according to a study led by researchers at San Francisco VA Medical Center (SFVAMC).

The test, developed in the study by the researchers, is a 14-point index combining medical history, cognitive testing, and physical examination. It requires no special equipment and can be given in a clinical setting such as a doctor’s office or at a patient’s bedside.

The new index is the “bedside” version of a longer, more technically comprehensive “best” test, also developed during the study, that is 88 percent accurate.

These are the first tools to accurately predict dementia, according to lead author Deborah E. Barnes, PhD, a mental health researcher at SFVAMC. Barnes described the tests in a presentation at the 2007 International Conference on Prevention of Dementia, in Washington, DC, sponsored by the Alzheimer’s Association.

“There are tests that accurately predict an individual’s chances of developing cardiovascular disease and other maladies, but, until now, no one has developed similar scales for dementia,” says Barnes, who also is an assistant professor of psychiatry at the University of California, San Francisco (UCSF).

As measured by the “bedside” index, the risk factors for developing dementia are an age of 70 or older, poor scores on two simple cognitive tests, slow physical functioning on everyday tasks such as buttoning a shirt or walking 15 feet, a history of coronary artery bypass surgery, a body mass index of less than 18, and current non-consumption of alcohol.

People who score 0 to 3 on the “bedside” test have a 6 percent chance of developing dementia within six years. A score of 4 to 6 indicates a 25 percent chance.

People with a score of 7 or higher have a 54 percent chance of developing dementia within six years.

The 18-point comprehensive, or “best,” test measures for all “bedside” risk factors plus factors that would be more difficult to measure as part of a routine clinical visit. These include brain magnetic resonance imaging (MRI) findings of enlarged ventricles –– the fluid-filled cavities between brain tissue -- or diseased white matter –– the nerve cells that transmit signals between grey matter; thickening of the internal carotid artery, which brings blood to the head and neck; and the presence of one or two copies of the e4 allele, or subtype, of APO-E, the gene that codes for the protein known as Apolipoprotein. The presence of APO-E e4 alleles is a known risk factor for Alzheimer’s disease.

A “best” test score of 0 to 4 indicates a 4 percent chance of developing dementia within six years. A score of 5 to 8 indicates a 25 percent chance.

A score of 9 or higher indicates a 52 percent chance of developing dementia within six years.

To develop the tests, the study authors tracked a broad range of physical, mental, demographic and other variables for six years among 3,375 participants in the Cardiovascular Health Cognition Study, a national prospective study sponsored by the National Heart, Lung, and Blood Institute (NHLBI). At the beginning of the study, none of the subjects were demented.

Their mean age was 76. Fifty-nine percent were women and 15 percent were African-American. By the end of the study, 14 percent of the subjects had developed dementia. The variables that were predictive of dementia in a statistically significant way became the basis of the tests.

The authors caution that there were no Hispanics or Asian-Americans included in the study population, and that the new scales need validation in other study groups before they can become standard clinical tools.

“We certainly plan to look at other groups to see if these results are valid across a variety of populations,” says Barnes.

Steve Tokar | EurekAlert!
Further information:
http://wwwncire.org

More articles from Studies and Analyses:

nachricht The importance of biodiversity in forests could increase due to climate change
17.11.2017 | Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig

nachricht Win-win strategies for climate and food security
02.10.2017 | International Institute for Applied Systems Analysis (IIASA)

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

Im Focus: Wrinkles give heat a jolt in pillared graphene

Rice University researchers test 3-D carbon nanostructures' thermal transport abilities

Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

NASA detects solar flare pulses at Sun and Earth

17.11.2017 | Physics and Astronomy

NIST scientists discover how to switch liver cancer cell growth from 2-D to 3-D structures

17.11.2017 | Health and Medicine

The importance of biodiversity in forests could increase due to climate change

17.11.2017 | Studies and Analyses

VideoLinks
B2B-VideoLinks
More VideoLinks >>>