WASHINGTON, June 7 (Reuters) - U.S. Vice President Dick Cheney, a survivor of four heart attacks including a mild one shortly after the 2000 election, will have a routine heart checkup on Friday, his office said on Thursday.

"The vice president will visit his doctors at the George Washington University Medical Faculty Associates tomorrow morning for a scheduled routine cardiology check-up," said his deputy press secretary Megan McGinn.

Cheney, 66, and one of President George W. Bush's closest advisers, had a defibrillator implanted in his chest in 2001 to help regulate his heartbeat.

In January 2006 he was treated for shortness of breath that was believed to have been triggered by a reaction to medication for a foot ailment.

Additionally, in March 2007 a blood clot was discovered in his leg after he returned from a nine-day trip to Asia and the Middle East. He was treated with blood-thinning medication.

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