An independent review panel is visiting the Children's Heart Unit at the Freeman Hospital in Newcastle later.
They are investigating a decision, made earlier this year, to close some hospitals and create centres of excellence.
It is part of a move to improve the service and concentrate expert surgeons in bigger units.
The panel was ordered to carry out the review by the Department of Health.
More top news
A mostly cloudy start to Sunday thanks to the position of a cold front which is pushing westwards. Good sunny spells further north though
Emma Jesson brings you Saturday night's forecast
Some good spells of sunshine developing at the coast throughout the remainder of Saturday afternoon. Fresh winds at the coast also