Sleep Apnea Causes Memory Loss

Sleep apnea sufferers may suffer brain tissue damage, which is responsible for memory.
Other researches have already proved the link between sleep apnea and risk of stroke, heart disease, and diabetes. This new research says that sleep apnea also leads to memory loss.
Sleep apnea patients stop breathing when asleep. They wake up to breathe normally and take oxygen. Breath interruption happens because throat, soft palate and tongue muscles relax, narrow the way for air to get inside. These patients may wake up about hundred of times during a night, this is why they never sleep well and are sleepy during daytime and have difficulties with remembering things and concentration.
Problems with memory were thought to be because of lack of sleep, but the research shows that it is caused by serious damage of brain tissue.
A team of researchers from University of California, Los Angeles examined patients with sleep apnea. They did MRI scans for brain underside tissues called mammillary bodies and found that the examined 43 disease sufferers had 20% smaller mammillary bodies than 66 participants without the disease.
Researchers suggest that the continuing lack of oxygen causes serious brain tissue damage leading to memory loss. Memory problems continue even when patients receive proper sleep apnea treatment, meaning that brain damage is very serious and difficult to recover.
There are other diseases such as Alzheimer's, leading to brain tissue damage, and these patients are taking thiamine or vitamin B1 to stop brain cell death. ULCA researchers are planning a further research to see if vitamin intake will stop brain damage in sleep apnea patients as well.

Connection Between Sleep Apnea, Stroke And Death

Obstructive sleep apnea decreases blood flow to the brain, elevates blood pressure within the brain and eventually harms the brain's ability to modulate these changes and prevent damage to itself, according to a new study published by The American Physiological Society. The findings may help explain why people with sleep apnea are more likely to suffer strokes and to die in their sleep.
Sleep apnea is the most commonly diagnosed condition amongst sleep-related breathing disorders and can lead to debilitating and sometimes fatal consequences for the 18 million Americans who have been diagnosed with the disorder. This study identifies a mechanism behind stroke in these patients.
The study, 'Impaired cerebral autoregulation in obstructive sleep apnea' was carried out by Fred Urbano, Francoise Roux, Joseph Schindler and Vahid Mohsenin, all of the Yale University School of Medicine in New Haven, Connecticut. It appears in the current issue of the Journal of Applied Physiology.
During sleep apnea episodes, the upper airway becomes blocked, hindering or stopping breathing and causing blood oxygen levels to drop and blood pressure to rise. The person eventually awakens and begins breathing, restoring normal blood oxygen and blood flow to the brain.
Ordinarily, the brain regulates its blood flow to meet its own metabolic needs, even in the face of changes in blood pressure -- a process known as cerebral autoregulation. This study found that the repeated surges and drops in blood pressure and blood flow during numerous apnea episodes each night reduces the brain's ability to regulate these functions.
Condition a health risk
Up to 4% of the population suffers from obstructive sleep apnea. In a previous study, Dr. Mohsenin and his colleagues showed that people with sleep apnea are three times more likely to suffer a stroke or die, compared to people in a similar state of health but without sleep apnea.
'After we found that sleep apnea is a risk factor for stroke and death, independent of other risk factors, we hypothesized that there must be something wrong with the regulation of blood flow to the brain,' Dr. Mohsenin said. Participants included people with severe sleep apnea who experienced more than 30 apneas an hour during sleep time. The participants were about 47 years old, were free of cardiac disease and had not experienced any strokes. The study also included a control group which did not have sleep apnea but was similar in most other ways.