http://www.usatoday.com:80/news/health/2009-07-12-veterans13_N.htm
Vets with post-traumatic stress are at high risk of dementia

By Mary Brophy Marcus, USA TODAY
Veterans diagnosed with post-traumatic stress disorder (PTSD) have a
significantly higher risk of developing dementia compared with veterans who
don't have the disorder, a study reports today.
Using data from the Department of Veterans Affairs National Patient Care
Database, scientists from the University of California-San Francisco analyzed
files of 181,093 veterans ages 55 and older without dementia from 1997 to 2000.
The mean age at the start of the study was 68, and 97% were male.


DRINKING: Repeated deployments raise soldiers' stress and enrollment in alcohol
treatment.
During the follow-up period from 2001 to 2007, the researchers learned that
53,155 veterans were diagnosed with dementia or cognitive impairment. Veterans
who had post-traumatic stress developed dementia at a rate of 10.6% over seven
years, while those who didn't have the disorder had a rate of 6.6%, the
researchers reported.

The researchers reported their findings at the International Conference on
Alzheimer's Disease in Vienna.

"The results are not surprising," says Robert Wilson, neuropsychologist in the
Alzheimer's Disease Center at Rush University Medical Center. "Our thinking is
that things like PTSD or chronic anxiety or depression don't cause dementia
themselves but may make us more vulnerable to it."

Other research presented Sunday and today at the Alzheimer's conference:

•Two separate studies evaluate the influence of DHA, an omega 3 fatty acid,
supplements on brain health. The first study, which was government-funded, looks
at DHA supplementation in patients with mild to moderate Alzheimer's and finds
that the supplements offered no cognitive benefits to patients. The other,
sponsored by a DHA maker, Martek Biosciences Corp., suggests supplements may
help in healthy older adults who have mild memory loss.

•Wake Forest University School of Medicine scientists find that moderate alcohol
intake (one to two drinks a day) is linked to a 37% lower risk of dementia in
patients with normal cognition at baseline, not those who already have cognitive
impairment.

•University of Connecticut scientists report that in an online study of 676
adults, many don't know the risk factors for dementia: 61% incorrectly believe
there is no link between dementia and the cardiovascular risk factors obesity
and high blood pressure; 66% do not know high stress is a risk factor; and 38%
are unaware exercise protects against dementia.

•The number of people who have Alzheimer's disease and dementia is increasing
among the "oldest old," those over 80, Italian researchers report. The finding
contradicts observational studies that suggested the number of people with
dementia levels off and perhaps drops late in life.







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