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Normally it's kept on a machine pumping blood till transplant. AFAIK.
In some cases the donor heart needs to be zapped back into beating.
even during the bypass surgeries the heart is taken out of the chest and put on the table, machines is pumping the blood while the heart is non functional during the heart by pass.
once the arteries and veins are cleared from shit, the heart is put back in the chest and then it is massaged and/ or given electric shocks to revive it.
In some cases, heart never turns back on again , no matter how many shocks you give or hand massage it.
It is seriously luck of the draw.