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HEALTH MATTERS: To sleep better, perchance to live longer
Published in Daily News Egypt on 01 - 08 - 2008

WASHINGTON: Shakespeare once called sleep the balm of hurt minds.
Bodies, too, apparently.
People with the severe form of apnea, which interferes with sleep, are several times more likely to die from any cause than are folks without the disorder, researchers report in Friday s edition of the journal Sleep.
The findings in the 18-year study confirm smaller studies that have indicated an increased risk of death for people with apnea, also known as sleep-disordered breathing.
This is not a condition that kills you acutely. It is a condition that erodes your health over time, Dr Michael J. Twery, director of the National Center on Sleep Disorders Research, said in a telephone interview.
People with such disorders have been sleep deprived for perhaps very long periods of time, they are struggling to sleep. If this is happening night after night, week after week, on top of all our other schedules, this is a dangerous recipe, said Twery, whose center is part of the National Heart, Lung and Blood Institute.
The institute estimates that 12 million to 18 million people in the US have moderate to severe apnea. The condition is not always detected because the sufferer is asleep when the problem occurs and it cannot be diagnosed during a routine office visit with a doctor. Researchers tested the patients for sleep-disordered breathing in the laboratory and then followed them over several years.
For people with apnea, their upper airway becomes narrowed or blocked periodically during sleep. That keeps air from reaching the lungs. In some cases, breathing stops for seconds to a minute or so; the pauses in breathing disrupt sleep and prevent adequate amounts of oxygen from entering the bloodstream.
When you stop breathing in your sleep you don t know it, it doesn t typically wake you up, Twery said. Instead, it can move a person from deep sleep to light sleep, when breathing resumes. But the overall sleep pattern is disturbed, and it can happen hundreds of times a night.
He said that a person typically will have four or five cycles per night of light sleep, deep sleep and REM (rapid eye movement) sleep, when most dreams occur. More deep sleep comes early in the night with more REM sleep closer to waking up. This pattern helps control hormones, metabolism and levels of stress.
The institute, part of the National Institutes of Health, says apnea has been linked to a greater risk of heart disease, high blood pressure, stroke, diabetes and excessive daytime sleepiness.
In the new report, the Wisconsin Sleep Cohort followed 1,522 men and women, ages 30 to 60. The annual death rate was 2.85 per 1,000 people per year for people without sleep apnea.
People with mild and moderate apnea had death rates of 5.54 and 5.42 per 1,000, respectively, and people with severe apnea had a rate of 14.6, researchers said.
Cardiovascular mortality accounted for 26 percent of all deaths among people without apnea and 42 percent of the deaths among people with severe apnea, according to the researchers led by Terry Young of the University of Wisconsin, Madison.
In the same issue of the journal Sleep, a separate study of 380 adults between 40 and 65 in Australia came to a similar conclusion. This study found that after 14 years, about 33 percent of participants with moderate to severe sleep apnea had died, compared with 6.5 percent of people with mild apnea and 7.7 percent of people without apnea.
Our findings, along with those from the Wisconsin Cohort, remove any reasonable doubt that sleep apnea is a fatal disease, said lead author Dr Nathaniel Marshall of the Woolcock Institute of Medical Research in Sydney, Australia.
Apnea often is treated with a device that delivers continuous positive airway pressure through a mask over the nose and/or mouth. The U.S. study found that patients using this device had reduced death rates.
There has been debate over whether to use airway pressure to treat patients who are not sleepy in the daytime, the report noted.
The US researchers noted that while theirs was a large study, 95 percent of the participants were white and most had adequate income and access to health care.
It is likely that our findings may underestimate the mortality risk of SDB in other ethnic groups or the lowest socio-economic strata where there is poor awareness and access to health care, they said.
The US research was supported by the National Institutes of Health. The Australian study was supported by the Australian National Health and Medical Research Council.


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