Cooling the brain could be a way for doctors to reduce brain injury following stroke.
Hypothermia has long been considered as a way of reducing neurological damage, but a new study by scientists at the University of California has set about establishing whether the technique is safe.
Results have yet to be announced by researchers, who are using a metallic cooling catheter inserted into the body's largest vein to reduce the body's temperature.
The University of California San Diego's former director of the Stroke Center, Patrick Lyden, said: "We know hypothermia works, but is it safe when you consider age and other conditions such as diabetes or hypertension?"
Earlier this week, the American Association of Neurological Surgeons warned Britons to be wary of the risk of brain injury when putting up Christmas decorations.
The organisation drew attention to falls on ice and impacts sustained on wood floors as being a particular risk.
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Posted by Paul Breen