Former US vice president Dick Cheney was in recovery after getting a heart transplant at a hospital in Virginia, his spokeswoman said.
Cheney "is recovering in the intensive care unit of Inova Fairfax Hospital in Falls Church, Virginia, after undergoing heart transplant surgery yesterday," spokeswoman Kara Ahern said in a statement.
Cheney, 71, had been on a list for a heart transplant for more than 20 months, the statement noted.
"Although the former vice president and his family do not know the identity of the donor, they will be forever grateful for this lifesaving gift," the statement added.
Cheney, in a 2011 interview with NBC News, said a special pump implanted in his heart in 2010 was "a miracle of modern technology" that had kept him alive but was a "temporary measure."
Cheney has had a long list of health scares.
He suffered his first heart attack in 1978 at the age of 37 and underwent quadruple bypass surgery in 1988. He had since had two artery-clearing angioplasties and in 2001 was fitted with a pacemaker.
Despite his persistent health problems, Cheney has remained a prominent Republican on the political scene since leaving office, often criticizing President Barack Obama.
One of America's most powerful and controversial vice presidents, Cheney was a driving force behind George W Bush's "war on terror" that included the invasions of Iraq and Afghanistan.
It also included the wiretapping of US citizens without a warrant and the use of harsh interrogation methods that met global definitions of torture.