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WASHINGTON (Reuters) - Former Vice President Dick Cheney suffered a mild heart attack, but was "feeling good" and was expected to leave the hospital this week, his office said in a statement on Tuesday.Cheney, 69, who served under President George W. Bush, was hospitalized on Monday after experiencing chest pains. He has a long history of heart ailments including four previous heart attacks."Lab testing revealed evidence of a mild heart attack," Cheney's office said. "He underwent a stress test and a heart catheterization. He is feeling good and is expected to be discharged in the next day or two."His previous heart attack occurred shortly after the November 2000 election when he was elected vice president. Shortly after that, Cheney in 2001 had a heart defibrillator implanted to monitor his heart and shock it back into a normal rhythm if abnormal beating occurred.The device was replaced in 2007 because its battery was running down.