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Warning: This video contains images of open-heart surgery.
Gentle shockwaves could regenerate the heart tissue of patients after bypass surgery, according to new research.
A study of 63 people in Austria found those given the new treatment could walk further - and their hearts could pump more blood.
Larger trials of the device, dubbed a "space hairdryer" by researchers, are now planned to try to replicate the results in a wider group of patients.
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