MAIL ONLINE: Everything you need to know if your loved one has a STROKE: Broadcaster Andrew Marr investigates bizarre treatments to minimise the effects in a new health documentary

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The patients are still being monitored. But there are drawbacks, says Philippa Tyrrell, a professor of stroke medicine at the University of Manchester.

'It is expensive and it's a lot to go through — and you must never assume that because it's new it is necessarily going to work, or work better than what we already have.'