No other details about the donor lungs are known.
Sarah's health was deteriorating when a judge intervened in her case last week, giving her a chance at the much larger list of organs from adult donors. U.S. District Judge Michael Baylson ruled June 5 that Sarah and 11-year-old Javier Acosta, of New York City, should be eligible for adult lungs.
Critics warned there could be a downside to having judges intervene in the organ transplant system's established procedures. Lung transplants are difficult procedures, and some experts say child patients tend to have more trouble with them than adults do.
Sarah's relatives, who are from Newtown Square, just west of Philadelphia, were "beyond excited" about her new lungs but were "keeping in mind that someone had to lose a family member and they're very aware of that and very appreciative," family spokeswoman Maureen Garrity said earlier Wednesday.
The Murnaghan family noted that Sarah's successful surgery was the result of another family's loss.
"We are elated this day has come, but we also know our good news is another family's tragedy. That family made the decision to give Sarah the gift of life — and they are the true heroes today," Sarah's family said in their statement.
The national organization that manages organ transplants, the Organ Procurement and Transplantation Network, added Sarah to the adult waiting list after the judge's ruling. Her transplant came two days before a hearing was scheduled on the family's request for a broader injunction.
The network has said 31 children under age 11 are on the waiting list for a lung transplant. Its executive committee held an emergency meeting this week but resisted making emergency rule changes for children under 12 who are waiting on lungs, instead creating a special appeal and review system to hear such cases.