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Severe breathing disorders during sleep are associated with an increased risk of dying
Date:8/17/2009

Severe breathing disorders during sleep are associated with an increased risk of dying from any cause according to research published this week in the open access journal PLoS Medicine. The study finds that the increased risk of dying is most apparent in men between 40 and 70 years of age with severe sleep-disordered breathing, and suggests a specific link between this condition and death from coronary heart disease in men.

Sleep-disordered breathing is characterized by a collapse of the upper airway during sleep, leading to numerous, brief interruptions of breathing known as sleep apnea, and it is experienced by one in four men and one in ten women. Although it is increasingly recognised as a serious conditionlinked with hypertension, heart failure and stroke, as well as causing daytime sleepiness with dangerous consequences such as impairing a person's ability to drive safelyprevious studies investigating sleep-disordered breathing have not included participants in sufficient numbers to identify specific factors (such as age and sex) that might predict an increased risk of dying.

In the Sleep Heart Health Study, Naresh Punjabi of Johns Hopkins University, Baltimore and colleagues studied over 6,000 men and women, initially assessing their night-time breathing, sleep patterns and blood oxygen levels, and calculating each participant's apnea-hypopnea index (AHI), defined as the number of pauses in breathing severe enough to cause a 4% drop in blood oxygen saturation, per hour of sleep. Following the study participants over an average of 8 years, they found that those with severe sleep disordered breathing (AHI of 30 or above) at the outset were one and a half times more likely to die from any cause, irrespective of age, sex, race, body mass index, smoking status and prevalent medical conditions. Men aged 40-70 with severe sleep-disordered breathing were twice as likely to die from any cause as men the same age not suffering from the co
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Contact: Andrew Hyde
press@plos.org
44-122-346-3330
Public Library of Science
Source:Eurekalert

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