Navigation Links
Memory loss linked to common sleep disorder
Date:6/10/2008

For the first time, UCLA researchers have discovered that people with sleep apnea show tissue loss in brain regions that help store memory. Reported in the June 27 edition of the journal Neuroscience Letters, the findings emphasize the importance of early detection of the disorder, which afflicts an estimated 20 million Americans.

Sleep apnea occurs when a blocked airway repeatedly halts the sleeper's breathing, resulting in loud bursts of snoring and chronic daytime fatigue. Memory loss and difficulty focusing are also common complaints. Prior studies have linked the disorder to a higher risk of stroke, heart disease and diabetes.

"Our findings demonstrate that impaired breathing during sleep can lead to a serious brain injury that disrupts memory and thinking," said principal investigator Ronald Harper, a distinguished professor of neurobiology at the David Geffen School of Medicine at UCLA.

The study focused on structures called mammillary bodies, so named because they resemble small breasts, on the underside of the brain.

The UCLA team scanned the brains of 43 sleep apnea patients, using magnetic resonance imaging (MRI) to collect high-resolution images of the entire brain, including slices of the mammillary bodies.

The structures' small size and proximity to bone and fluid make them difficult to measure by conventional MRI. So the researchers manually traced the mammillary bodies from the high-resolution scans and calculated their volumes from the hand-drawn outlines.

When they compared the results to images of 66 control subjects matched for age and gender, the scientists discovered that the sleep apnea patients' mammillary bodies were nearly 20 percent smaller, particularly on the left side.

"The findings are important because patients suffering memory loss from other syndromes, such as alcoholism or Alzheimer disease, also show shrunken mammillary bodies," said lead author Rajesh Kumar, a UCLA assistant researcher in neurobiology.

"Physicians treat memory loss in alcoholic patients with massive amounts of thiamine, or vitamin B1," he added. "We suspect that the dose helps dying cells to recover, enabling the brain to use them again."

The scientists' next step is to determine how sleep apnea causes tissue loss in the mammillary bodies.

Harper hypothesizes that repeated drops in oxygen lead to the brain injury. During an apnea episode, the brain's blood vessels constrict, starving its tissue of oxygen and causing cellular death. The process also incites inflammation, which further damages the tissue.

"The reduced size of the mammillary bodies suggests that they've suffered a harmful event resulting in sizable cell loss," Harper said. "The fact that patients' memory problems continue despite treatment for their sleep disorder implies a long-lasting brain injury."

In a future study, Harper and Kumar will explore whether taking supplemental vitamin B1 helps restore sleep apnea patients' memory. The vitamin helps move glucose into the cells, preventing their death from oxygen starvation.

"UCLA researchers used sophisticated imaging technology to identify brain lesions associated with impaired memory in individuals with obstructive sleep apnea," said Elizabeth G. Nabel, director of the National Heart, Lung and Blood Institute, which funded the study. "These results underscore the importance of early diagnosis and treatment of sleep-disordered breathing, which can have long-term effects on patients' health and well-being."

Obstructive sleep apnea occurs when the muscles in the throat, soft palate and tongue relax during sleep and sag, narrowing the airway. The tongue slides to the back of the mouth, blocking the windpipe and cutting off oxygen to the lungs.

The sleeper wakes up, gasping for air, and falls back into a fitful sleep. The cycle can repeat itself hundreds of times per night.


'/>"/>

Contact: Elaine Schmidt
eschmidt@mednet.ucla.edu
310-794-2272
University of California - Los Angeles
Source:Eurekalert  

Related medicine news :

1. Nutrition 21 Launches Iceland Health(R) Advanced Memory Formula via Direct Response Channel
2. Smoking Tied to Memory Loss in Middle Age
3. Drinking polyphenol-rich Concord grape juice may improve memory in older adults
4. Discovery of cell linked to learning and memory
5. Memory lane: Older persons with more schooling spend fewer years with cognitive loss
6. Moral philosopher questions memory manipulation
7. When It Comes to Memory, Its All About Location
8. Common Chemotherapy Drug Linked to Memory Problems
9. Common Medications May Harm Memory in Older People
10. Men More Likely to Have Problems with Memory and Thinking Skills
11. Two Men to Walk Across America for Autism Aid, Awareness, and Loving Memory of Young Boy
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Memory loss linked to common sleep disorder
(Date:2/13/2016)... ... , ... Valentine’s Day is nearly upon us, and most singles could probably ... flawless hair, and a sparkling personality are all well and good, but if somebody ... home with Rover. (Actually, man’s best friend might not even want to be near ...
(Date:2/13/2016)... ... February 13, 2016 , ... In its newly ... vein visualization technology should be used to ensure patient safety when placing an ... INS Standards mandate the use of vein visualization technology in patients with difficult ...
(Date:2/12/2016)... ... 12, 2016 , ... According to an article published February 4th ... significant portion of hernia repairs throughout the United States. Commenting on this article, Beverly ... that this trend has not only been expected, but it seems to be a ...
(Date:2/12/2016)... ... February 12, 2016 , ... CDRH Enforcement Trends: , Back to the Future , ... , As Winston Churchill said, “Those who don’t learn from history are doomed to ... expect when they come knocking this year. But that takes time. , Take a ...
(Date:2/12/2016)... ... February 12, 2016 , ... T.E.N., a ... closed for the ISE Southeast Awards 2016. Finalists and winners of the ISE® ... Southeast Executive Forum and Awards Gala on March 15, 2016 at the Westin ...
Breaking Medicine News(10 mins):
(Date:2/12/2016)... February 12, 2016 ... vermerkt)   http://www.sedar.com ) und ... abrufbar.    --> http://www.sedar.com ... http://www.telestatherapeutics.com abrufbar.    --> ... heute seinen Konzernabschluss des zweiten Quartals ...
(Date:2/12/2016)...  Memorial Hermann Health System has teamed up with ... bring a one-of-a-kind experience to pediatric patients at ... as 360-degree video and Google Cardboard, Howard was able ... giving the patients and their families an unexpected, and ... on video . Memorial Hermann IRONMAN ...
(Date:2/12/2016)... , Feb. 12, 2016  Eli Lilly and Company ... Court decided the Alimta® (pemetrexed disodium) vitamin regimen patent would ... the UK, France , Italy ... to dilute the product only with dextrose solution.  ... 2015, the UK Court of Appeal held that Lilly,s patent ...
Breaking Medicine Technology: