What is a Stroke, or Arteriovenous Malformation?
A stroke happens when the blood supply to the brain has been interrupted, and it can happen in many different ways:
- A blood clot or narrowing has cut off the blood supply - this is an ischaemic stroke
- A weakened blood vessel has burst - this is a haemorrhagic stroke
- A mini stroke caused by blocked blood supply up to 24 hours - this is a transient ischaemic attack
An abnormal tangle of blood vessels that develops shortly before or after birth are called arteriovenous malformations (AVM), which often mimics stroke symptoms. The blood vessels in the brain are like a network of roads all leading to different areas, and these different areas of the brain are responsible for doing different things, which is why the challenges after stroke or AVM often vary.
When looking out for the signs that someone is having a stroke, remember the word 'FAST':
- Face - or mouth or eye dropping on one side or unable to smile
- Arms - unable to lift both arms and keep them there due to numbness or weakness in one arm
- Speech - garbled, slurred, or unable to talk; may have problems understanding what's being said
- Time - if the signs are there, it's time to dial 999 immediately


