Navigation Links
Sleep Apnea May Be Tied to 'Silent' Strokes, Study Finds
Date:2/1/2012

By Kathleen Doheny
HealthDay Reporter

WEDNESDAY, Feb. 1 (HealthDay News) -- Sleep apnea, the disorder marked by abnormal pauses in breathing during sleep, is already known to boost the risk of stroke. Now, a new study links sleep apnea to so-called silent strokes, in which there is tissue death in the brain without symptoms.

In another new study, researchers found that rapid memory loss before a stroke boosts the risk of the stroke being fatal.

Both studies are slated for presentation Wednesday at the American Stroke Association's International Stroke Conference in New Orleans.

Stroke affects 795,000 Americans annually, according to the association.

In one study, Dr. Jessica Kepplinger, a fellow at the University of Technology in Dresden, Germany, and her colleagues evaluated 56 patients who had a stroke. They knew that silent strokes had been linked to an increased risk of strokes. However, "there are barely any studies that have investigated the relationship between sleep apnea and the so-called clinically silent strokes," she said.

To look at the relationship, they first gave patients in-hospital testing for apnea. "We found an overall high frequency of sleep apnea, 91 percent, in our study population of acute stroke patients, which underlines the importance of this stroke risk factor," Kepplinger said.

The team also performed brain-imaging studies. Those with sleep apnea were more likely to have the silent strokes, as evidenced on the brain scans, the researchers found. Having more than five episodes a night was linked with having silent strokes. The higher the severity of the apnea, the more likely these silent strokes were found on brain imaging.

The more severe the apnea, the less favorable the outcome when the patient was discharged.

The patients were on average 67 years old, and just over half of them were women, the study authors noted.

While the study found an association between sleep apnea and stroke, it did not prove a cause-and-effect relationship.

In the second study, Qianyi Wang, a graduate student at the Harvard University School of Public Health, and colleagues evaluated nearly 12,000 men and women, all above age 50, enrolled in the U.S. Health and Retirement Study.

All were stroke-free at the start. The men and women were given memory tests every two years for up to 10 years.

Over time, 1,820 strokes were reported, including 364 people who died after the stroke.

The others were stroke-free for the entire follow-up period, the study authors noted.

The research looked at the memory declines over time. Those who later survived a stroke "had memory decline that is nearly twice as fast as stroke-free individuals, even before their stroke," Wang said.

"For people who do not survive stroke, this difference is even more striking," said M. Maria Glymour, an assistant professor of society, human development and health at Harvard and a study co-author. "Prior to stroke, people who later died shortly after stroke were declining three times as fast as the stroke-free."

The study was funded by the U.S. National Institute on Aging and the American Heart Association.

"Our study is the first national picture of how memory changes over the long-term before and after stroke onset, compared to individuals who do not have a stroke," Glymour said.

Both studies provide some valuable information, said Dr. Ralph Sacco, chair of neurology at the University of Miami Miller School of Medicine and past president of the American Heart Association. He reviewed the findings.

"It's been mainly in smaller studies that sleep apnea has been shown to be a risk factor for stroke," Sacco said. The new research, he noted, goes even further by linking sleep apnea with the milder "silent" strokes.

"There are many reasons to treat sleep apnea, including reducing the risk for clinical and now silent stroke," Sacco said.

The memory-loss study, he said, "is telling us that those who have the worst memory loss may have a greater death rate when they have the stroke." Those with more memory loss in the study may also have had more risk factors for stroke, Sacco added.

Even so, he said, the message seems to be that taking care of brain health may help us in several ways. "What is good for our memory may also be good for surviving a stroke," Sacco said.

Because these studies were presented at a medical meeting, the data and conclusions should be viewed as preliminary until published in a peer-reviewed journal.

More information

Visit the American Stroke Association to learn more about stroke.

SOURCES: Jessica Kepplinger, fellow, University of Technology Dresden, Germany; Ralph Sacco, M.D., chair of neurology, University of Miami Miller School of Medicine; M. Maria Glymour, S.D., assistant professor of society, human development and health, Harvard School of Public Health; Qianyi Wang, graduate student, Harvard School of Public Health; Feb. 1, 2012, presentations, International Stroke Conference, New Orleans


'/>"/>
Copyright©2010 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. Obstructive Sleep Apnea in Kids May Have Genetic Cause
2. Sleep HealthCenters to Sponsor North East Sleep Society 2010
3. America's Hidden Pandemic: 100 Million Suffer From Sleep Problems
4. Solutions for Sleep Problems: Harvard's Improving Sleep Special Health Report and New Sleep Apnea Video
5. Behavioral therapy improves sleep and lives of patients with pain
6. Sleep problems and sleepiness increase the risk of motor vehicle accidents in adolescents
7. Severe sleep apnea decreases frequency of nightmare recall
8. Severe Sleep Apnea Has Silver Lining
9. The role of sleep in brain development
10. Sleep More, Lose Weight – Sleeplessness Linked to Obesity
11. National Sleep Awareness Week(R) (March 7-13): How Are You Sleeping?
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Sleep Apnea May Be Tied to 'Silent' Strokes, Study Finds
(Date:1/13/2017)... Madrid, Spain (PRWEB) , ... January 13, 2017 , ... ... the Melia Avenida America hotel on March 3-4, 2017. This Congress is expertly ... focused on the management of patients with lung cancer. , Chaired by Dr. Giorgio ...
(Date:1/13/2017)... Princeton, NJ (PRWEB) , ... January 13, 2017 , ... ... of sale companions, will be showcasing the next generation companion scanner and data collector ... City. The new KDC270 has been created as an answer to the market’s need ...
(Date:1/13/2017)... ... January 13, 2017 , ... An inventor from Pahrump, Nev., used an unsavory medical experience ... me wear a Foley catheter and urine bag for a half year due to lazy ... decided that there should be a better way to do this." , He then designed ...
(Date:1/13/2017)... MN (PRWEB) , ... January 13, 2017 , ... People ... to endure jolts of pain whenever they brush their teeth. Sadly, most dental hygiene ... who have sensitive gums and teeth. For these people, continuing their daily oral care ...
(Date:1/13/2017)... ... January 13, 2017 , ... Friday, January 13 at 5 pm, ... room, increasing the size of the location to 90,000 square feet. , Included in ... course that takes customers on an educational tour of the historic route, with each ...
Breaking Medicine News(10 mins):
(Date:1/13/2017)... 13, 2017  Alfalfa, cattle, leafy greens and rosy cheeked ... film , which emphasizes the food industry,s shift from response ... COPAN,s Swab Rinse Kit (SRK™) ... sampling process in the wake of the new FDA ... COPAN is expanding the U.S. production of the ...
(Date:1/13/2017)... 13, 2017 The 2016 election resulted ... several states voting in favor of legalizing cannabis for recreational ... market in the U.S. In addition, the state of ... annual cannabis products sales. The ArcView Group has published an ... legal cannabis sales in the U.S. last year reached $6.7 billion, ...
(Date:1/13/2017)... 2017 Research and Markets has announced the ... report to their offering. ... Cystic fibrosis (CF) is a progressive genetic condition ... fibroses transmembrane conductance regulator (CFTR) gene from both parents. The defective ... and result in the buildup of a thick and sticky mucus ...
Breaking Medicine Technology: