Heart attack patients who were not expected to live are fit and healthy after scientists regenerated their hearts with stem cells in a ground-breaking trial which could help millions of people with heart failure.

The research is the first to show that scarring of heart muscle, associated with a heart attack can be reversed, a feat which doctors believed was impossible, and which could eventually end the need for transplants.

Scarring of the heart stops the organ pumping blood effectively and can lead to further attacks and sudden death.

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