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
Everton prove too strong for Middlesbrough, who leave the League Cup at the quarter finals.
Read Rob Nichols' thoughts ahead of Middlesbrough's game against Everton
Five men have been jailed for ram-raiding a cash machine from inside a shop in Ryedale, North Yorkshire.