President Bush this morning underwent a colorectal screening procedure at Camp David in which no polyps were found and no evidence of any abnormalities was discovered.
At 7:09am (EDT), Article XXV of the Constitution was invoked, temporarily transferring the power of the Presidency to Vice-President Dick Cheney. At that time, anesthesia was administered to the President. The procedure was concluded at 7:29am and the President awoke at 7:31am. The power of the Presidency was returned to President Bush at 9:24am.
The President says he feels "great" and will resume his normal routine at Camp David.
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George W. Bush, Statement by the Press Secretary Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/279505