Mr Duguid said investigations were continuing, involving a consultant neurologist and consultant cardiologist.

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Consultant cardiologist Dr David McEneaney is the surgeon in charge.

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Dr Gregory Lip, a consultant cardiologist and reader in medicine at the Birmingham City Hospital, said that anything that reduced the small risks of angiography was to be welcomed.

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Dr Marcus Flather, consultant cardiologist at the Royal Brompton and director of its clinical trials and evaluation unit said hospitals needed to boost the use of these effective treatments.

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Sanjay Kaul, a cardiologist at Cedars Sinai Hospital in L.A. who has been an FDA consultant, says the FDA should now require all cholesterol medicines to either do a big study showing they prevent heart problems before approval or only grant conditional approval and then demand the big study.

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