Doctors sometimes recommend older people take a low dose of aspirin to reduce their risk of the most common type of stroke, but a study suggests this is no more effective than a placebo and raises the risk of brain bleeds
Among those taking low-dose aspirin, 1.5 per cent experienced an ischaemic stroke during the study period, compared with 1.7 per cent in the placebo group. Taking into consideration the number of years each person was involved in the study, the researchers found aspirin didn’t reduce their risk of an ischaemic stroke. This remained true when they broke down the categories of participants according to their age, sex and race or ethnicity.
When it comes to aspirin’s side effects, 1.1 per cent of the participants who took it experienced bleeding inside or around their brain, compared with only 0.8 per cent of those taking a placebo. While this may sound like a small difference, a statistical analysis suggests it wasn’t a chance finding. These bleeds sometimes occurred following a blow to the head, such as during a fall, but were sometimes spontaneous.
This finding is especially important because intracranial bleeding is usually more fatal than an ischaemic stroke, says McNeil. As well as aspirin’s blood-thinning properties, people’s blood vessels naturally weaken with age, making them more likely to cause a haemorrhage, he says. The results only apply to people with no history of a cardiovascular condition, however. Low-dose aspirin may help to cut the risk of strokes in people with these conditions, says McNeil.
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