When an e-petition has 100,000 signatures, a debate must be held in Parliament on the issue in question.
The petition was launched 48 hours after the decision to transfer children's heart services to Birmingham.
Campaigners fighting to keep children's heart surgery at Glenfield hospital in Leicester are celebrating a High Court ruling.
A House of Commons debate will take place today (22 October) to discuss the closure of Glenfield's children's heart surgery.
The Secretary of State for Health, Jeremy Hunt, has asked for an initial review of plans to relocate the Glenfield Heart Unit.