The cooling trial, involving nine UK hospitals, is being led by researchers at the University Hospital of Wales, Cardiff.

Altogether, 1,900 patients worldwide are part of the trial, called TTM2.

Half of patients were cooled down, often with pads and cold water, to bring them down to a temperature of 33C – our normal body temperature is 37.5C. They’re kept like that for 24 hours, as well as getting all the usual life-saving treatment.

The other half are kept at normal temperature – but not allowed to get hot either – so the results can eventually be compared.

Dr Matt Morgan, intensive care consultant and researcher, is one of those leading the trial.

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