See the New York Times, "For Cheney, 71, New Heart Ends 20-Month Wait."
In appearances since he left office in 2009, Mr. Cheney has appeared gaunt and increasingly frail. Last August, he published an autobiography, “In My Time: A Personal and Political Memoir,” written with his daughter Liz Cheney, in which he reported that a team of doctors assessed his heart condition before George W. Bush chose him as his vice-presidential running mate in 2000. He also described writing a letter of resignation shortly after taking office and giving it to his counsel, David S. Addington, to be delivered to President Bush if he were incapacitated.And see Lonely Conservative, "Dick Cheney Recovering from Heart Transplant, Liberals React as Expected – Updated with More Lefty Hate." And Memeorandum.
In a government career with few parallels, Mr. Cheney, who was vice president for all eight years of Mr. Bush’s presidency, has been chief of staff to President Gerald R. Ford, represented Wyoming in Congress and served as defense secretary under the first President George Bush.
He is widely considered to have been among the most powerful vice presidents in American history, working behind the scenes on policies as varied as energy and counterterrorism and advocating an aggressive assertion of presidential power.
He was a lightning rod for critics of the Bush administration, and his influence as vice president during Mr. Bush’s second term was considerably diminished. But he remains revered on the political right and in the Republican Party and has been one of the Obama administration’s toughest critics, speaking out regularly despite his fragile health.