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 look ahead at the forecast for the Tyne Tees region
Police are urging people not to take the law into their own hands after a man was assaulted in a case of suspected mis-identification.
Theresa May has pledged a rapid response to try to get hundreds of Nestle workers at risk of redundancy back into work.