23 Feb 2008
Stroke patients suffering from sleep apnoea, which causes snoring and breathing difficulties, could be at higher risk of early death.
Swedish scientists focused on 132 stroke patients admitted to hospital for stroke rehabilitation between 1995 and 1997.
The study, published in the Annals of Internal Medicine, recorded overnight episodes of sleep apnoea from three weeks after the initial stroke for a period of ten years.
Some 88 per cent of the patients died at a follow-up point, including all of the patients with obstructive sleep apnoea, a condition in which breathing is blocked by collapsed airway tissues.
Furthermore, 96 per cent of patients with central sleep apnoea, during which breathing controlled by the brain is interrupted, also died.
Eighty-one per cent of patients without either form of sleep apnoea also died, with mortality rates for the obstructive sleep apnoea 76 per cent higher than patients with no apnoea at all.
Scientists now believe that a drop in night time levels of oxygen in the bloodstream could be linked to the increased mortality rate in sleep apnoea and stroke sufferers.
"Sleep apnoea occurs frequently among patients with stroke, but it is still unknown whether a diagnosis of sleep apnoea is an independent risk factor for mortality," Dr Karl A Franklin, who led the study, noted.
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