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Strokes explained

continued from page 4
  • Arteriovenous malformation (AVM). An additional risk factor applies only to people subject to one particular type of stroke. A person with an AVM is at increased risk for haemorrhagic stroke. AVMs are a tangle of defective blood vessels and capillaries in the brain; they have thin walls and are more likely to rupture.
  • Recurrence. Having already had a stroke puts you at higher risk for another one. Recurrent stroke is frequent - about 25 per cent of people who recover from a first stroke will have another one within five years. The risk of severe disability or death from stroke increases with each stroke recurrence, and the risk of recurrence is greatest soon after a stroke. About three per cent of stroke patients will have another stroke within 30 days of their first stroke, and one third of recurrent strokes take place within two years of the first stroke.
  • Heart disease. Heart disease, including abnormal rhythms of the heart that may lead to blood clots forming in the heart then breaking away, increases the risk of stroke.
  • Other risk factors include heavy alcohol consumption, high blood-cholesterol levels and illicit drug use.


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