Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Moderate to severe sleep apnea significantly raises stroke risk

24.05.2005


Moderate to severe cases of the nighttime breathing problem known as obstructive sleep apnea significantly increases the risk of suffering a stroke, according to a study to be presented at the American Thoracic Society International Conference on May 23.



The study of 1,475 people found that those with moderate to severe sleep apnea at the beginning of the study were 3 to 4 times more likely to have a stroke than a comparable group of patients without sleep apnea during the next four years.

The study did not find any significant increase in the odds of having a stroke for people with mild sleep apnea compared with people without sleep apnea. "The stroke risk we found for people with moderate to severe sleep apnea is quite significant-double the risk of other well-known risk factors for stroke, such as hypertension or diabetes," said senior researcher Douglas Bradley, M.D., Professor of Medicine and Director of the Centre for Sleep Medicine and Circadian Biology at the University of Toronto. He and colleagues Michael Arzt, M.D., and Terry Young, Ph.D., found that the risk of stroke was significant even after other risk factors for stroke, such as high blood pressure and obesity, were taken into account.


In obstructive sleep apnea, a person’s airways narrows, or totally collapses, during sleep. As a result, a person stops breathing briefly multiple times throughout the night. The person’s sleep is interrupted often, which may cause excessive daytime sleepiness or even high blood pressure.

The patients in the study were defined as having moderate to severe obstructive sleep apnea if their breathing stopped or slowed at least 20 times per hour of sleep. People whose breathing stopped or slowed between 5 and 20 times per hour of sleep were considered to have mild sleep apnea.

One reason obstructive sleep apnea may increase stroke risk is that it has been shown to cause high blood pressure, which is the most common risk factor for stroke, Dr. Bradley said. Another possible reason is that when a person stops breathing, the lack of oxygen kicks in the body’s "fight or flight" response. Part of that reaction is to make the blood more clottable, and blood clots in the brain can cause a stroke.

"This study provides yet another reason why it’s important to treat sleep apnea," Dr. Bradley said. "It also raises the question of whether people with sleep apnea should be put on aspirin therapy or given other anti-clotting drugs, which is what is done for other people with stroke risk. This is an issue that needs further research."

Jim Augustine | EurekAlert!
Further information:
http://www.thoracic.org/

More articles from Health and Medicine:

nachricht Study tracks inner workings of the brain with new biosensor
16.08.2018 | Rheinische Friedrich-Wilhelms-Universität Bonn

nachricht Foods of the future
15.08.2018 | Georg-August-Universität Göttingen

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Color effects from transparent 3D-printed nanostructures

New design tool automatically creates nanostructure 3D-print templates for user-given colors
Scientists present work at prestigious SIGGRAPH conference

Most of the objects we see are colored by pigments, but using pigments has disadvantages: such colors can fade, industrial pigments are often toxic, and...

Im Focus: Unraveling the nature of 'whistlers' from space in the lab

A new study sheds light on how ultralow frequency radio waves and plasmas interact

Scientists at the University of California, Los Angeles present new research on a curious cosmic phenomenon known as "whistlers" -- very low frequency packets...

Im Focus: New interactive machine learning tool makes car designs more aerodynamic

Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.

When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...

Im Focus: Robots as 'pump attendants': TU Graz develops robot-controlled rapid charging system for e-vehicles

Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.

Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....

Im Focus: The “TRiC” to folding actin

Proteins must be folded correctly to fulfill their molecular functions in cells. Molecular assistants called chaperones help proteins exploit their inbuilt folding potential and reach the correct three-dimensional structure. Researchers at the Max Planck Institute of Biochemistry (MPIB) have demonstrated that actin, the most abundant protein in higher developed cells, does not have the inbuilt potential to fold and instead requires special assistance to fold into its active state. The chaperone TRiC uses a previously undescribed mechanism to perform actin folding. The study was recently published in the journal Cell.

Actin is the most abundant protein in highly developed cells and has diverse functions in processes like cell stabilization, cell division and muscle...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

LaserForum 2018 deals with 3D production of components

17.08.2018 | Event News

Within reach of the Universe

08.08.2018 | Event News

A journey through the history of microscopy – new exhibition opens at the MDC

27.07.2018 | Event News

 
Latest News

Smallest transistor worldwide switches current with a single atom in solid electrolyte

17.08.2018 | Physics and Astronomy

Robots as Tools and Partners in Rehabilitation

17.08.2018 | Information Technology

Climate Impact Research in Hannover: Small Plants against Large Waves

17.08.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>