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1 in 5 U.S. Seniors Struggles With Memory Lapses

Some progress to dementia, while others regain their skills, researchers find

By Steven Reinberg
HealthDay Reporter


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MONDAY, March 17 (HealthDay News) -- More than one-fifth of Americans over age 70 have some memory impairment that isn't classified as dementia, a new study finds.

While an estimated 3.5 million Americans suffer from dementia, another 5.4 million over age 70 have some memory loss that affects their lifestyle but isn't severe enough to limit their ability to function normally, the study authors said.

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"An estimated 22 percent of individuals over age 70 have some type of cognitive impairment that does not reach the threshold of dementia," said lead researcher Brenda Plassman, an associate research professor of psychiatry at Duke University School of Medicine.

Previous studies hadn't been able to estimate this 22 percent number, Plassman said, adding, "The number is actually about 60 percent higher than the number who had dementia among the people in our study."

The findings are published in the March 18 issue of the Annals of Internal Medicine.

For the study, Plassman's team collected data on 856 people 71 years of age and older who were part of the Health and Retirement Study. The participants completed a neuropsychological exam, and close family members were asked about their relatives' memory and ability to do daily activities. The participants were followed from July 2001 through March 2005.

The researchers found that 22 percent of the participants had some form of memory loss that didn't reach the threshold for dementia. Among these people, about 24 percent had chronic health problems such as diabetes or heart disease that may have been the cause of their cognitive impairment.

"The people with cognitive impairment without dementia were at higher risk of progressing to dementia within a year or so," Plassman said. "We estimated that people with cognitive impairment without dementia progressed to dementia at about the rate of 12 percent a year."

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Copyright © 2008 ScoutNews, LLC. All rights reserved.
Last updated 3/17/2008

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SOURCES: Brenda Plassman, Ph.D., associate research professor of psychiatry, Duke University Medical Center, Durham, N.C.; Colin Milner, chief executive officer, International Council on Active Aging, Vancouver, British Columbia, Canada; March 18, 2008, Annals of Internal Medicine


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