Striking nurses at Mount Sinai approved a new contract that ends a monthlong strike at its hospitals, but their counterparts at NewYork Presbyterian rejected a proposed deal Wednesday, ensuring the walkout will continue at some of New York City’s major medical centers.

Mount Sinai said Wednesday that an overwhelming majority of its unionized nurses voted to ratify new three-year pacts.

Brendan Carr, CEO of Mount Sinai, said its nurses will begin reporting back to work Saturday. He urged hospital staff to come together with empathy and respect and a “shared culture” as its unionized nurses return.

“The past several weeks have been challenging, emotional, frustrating, and exhausting in different ways for all of us,” Carr said in a letter to staff. “I want to remind us all that health care is built on compassion, and that compassion must extend not only to our patients, but also to one another.”

NewYork Presbyterian said it was disappointed its nurses did not ratify a proposal from mediators that hospital administrators had accepted and that the union top leaders had urged them to approve, over the objections of its own bargaining committee.

“We believe the proposal, which includes compromises, is fair and reasonable and reflects our respect for our nurses and the critical role that they play,” the hospital said in a statement.

The union and spokespersons for Montefiore — the other system where nurses are on strike — didn’t immediately respond to emails seeking comment.