Resources - July 29, 2019
In recent years, there has an uptick in the number of dementia cases diagnosed. Alzheimer’s Disease International estimated there were approximately 50 million people living with dementia in 2017, and they predict that number will roughly double every 20 years, highlighting just how pervasive dementia is across the world.
While you may have heard of dementia, you may be less familiar with the term Lewy Body Dementia (LBD), or dementia with Lewy bodies. According to the US Library of Medicine, dementia with Lewy bodies is estimated to affect 1.4 million people in the United States. It is the second most common dementia after Alzheimer’s disease, yet only accounts for about 5 percent of all dementia cases in older individuals.
If the condition sounds familiar, you may have heard about it in the news recently. Media mogul Ted Turner revealed in an interview on CBS that he is suffering from Lewy body dementia. And Robin Williams, the well-known comedian and Mrs. Doubtfire and Good Will Hunting actor took his own life in 2014, at the age of 63, while suffering from the little-known disorder.
What is LBD?
Lewy bodies are named for Dr. Friederich Lewy, the German neurologist who in 1912 discovered abnormal protein deposits that disrupt the brain’s normal functioning in people with Parkinson’s disease. These abnormal deposits are now called “Lewy bodies.” According to the National Institute on Aging (NIA), Lewy body dementia (LBD) is a disease associated with these abnormal protein deposits in the brain. NIA states “these deposits affect chemicals in the brain whose changes, in turn, can lead to problems with thinking, movement, behavior and mood.”
Doctors do not yet know what causes the condition and, unfortunately, there is no cure. LBD is often confused with Alzheimer’s (due to mental confusion) and/or Parkinson’s Disease (due to shaking and trouble with movement). But unlike either of these conditions, people with LBD don’t typically have a measured, steady decline. LBD is much more unpredictable. For instance, mental capacity may be poor in the morning and but sharp in the evening. Or a person may have the ability to walk one day and be completely bed-ridden the next.
A new study in The Lancet, “Investigating the genetic architecture of dementia with Lewy bodies: a two-stage genome-wide association study,” underscored that LBD has a unique genetic profile, distinct from other types of dementia.
“Dementia with Lewy bodies is often misunderstood as being a mixture of Alzheimer’s and Parkinson’s, but this confirms it’s actually a unique condition,” said Doug Brown, Ph.D., director of research at Alzheimer’s Society, which funded the study.
According to the study, patients with LBD don’t have as much trouble with short-term memory as Alzheimer’s patients, but they deteriorate more rapidly and patients experience paranoia and hallucinations along with failing executive function.
“Dementia with Lewy bodies accounts for 10 to 15 percent of dementia cases, yet our understanding of it lags beyond the more well-known Alzheimer’s disease, partly because it’s commonly misdiagnosed,” said senior study investigator Jose Bras, Ph.D., a UCL Institute of Neurology and Alzheimer’s Society senior research fellow. “Our findings clarify the disease’s distinctive genetic signature, which should, in the future, help improve clinical trials and lead to more targeted treatments.”
Symptoms of LBD
The Mayo Clinic lists the following symptoms of dementia with Lewy bodies on their website: