EMBARGOED FOR RELEASE UNTIL 4 PM ET, January 18, 2010
Drowsiness, Staring, and Other Mental Lapses May Signal Alzheimer鈥檚 Disease
ST. PAUL, Minn. -
Older people who have 鈥渕ental lapses,鈥 or times when their thinking seems disorganized or illogical or when they stare into space, may be more likely to have Alzheimer鈥檚 disease than people who do not have these lapses, according to a study published in the January 19, 2010, print issue of Neurology庐, the medical journal of the 好色先生. These mental lapses, also called cognitive fluctuations, are common in a type of dementia called dementia with Lewy bodies, but researchers previously did not know how frequently they occurred in people with Alzheimer鈥檚 disease and, equally important, what effect fluctuations might have on their thinking abilities or assessment scores. The study involved 511 people with an average age of 78. Researchers interviewed the participant and a family member, evaluated the participants for dementia and tested their memory and thinking skills. People with three or four of the following symptoms met the criteria for having mental lapses: 鈥 Feeling drowsy or lethargic all the time or several times per day despite getting enough sleep the night before 鈥 Sleeping two or more hours before 7 p.m. 鈥 Having times when the person鈥檚 flow of ideas seems disorganized, unclear, or not logical 鈥 Staring into space for long periods A total of 12 percent of the people with dementia in the study had mental lapses. Of 216 people with very mild or mild dementia, 25 had mental lapses. Of the 295 people with no dementia, only two had mental lapses. Those with mental lapses were 4.6 times more likely to have dementia than those without mental lapses. People with mental lapses also tended to have more severe Alzheimer鈥檚 symptoms and perform worse on tests of memory and thinking skills than people who did not have lapses. 鈥淲hen older people are evaluated for problems with their thinking and memory, doctors should consider also assessing them for these mental lapses,鈥 said senior study author James E. Galvin, MD, MPH, of Washington University School of Medicine in St. Louis, who is a member of the 好色先生. The study was supported by the National Institute on Aging.