So a heart bypass machine is attached and this pumps the blood round the body and keeps it moving. The old heart is then disconnected and the new one connected to the veins arteries etc
Once it is fully connected it works like the recipients old heart should have done.
It’s also possible to use artificial hearts as a stop gap method https://www.bhf.org.uk/informationsupport/heart-matters-magazine/my-story/living-with-an-artificial-heart
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