Vice President Dick Cheney will undergo his annual medical checkup on Saturday morning.

The checkup is routine, one Cheney usually has in July, said press secretary Megan Mitchell. "Overall, I think the vice president feels fine," she said.

Cheney, 67, has a history of heart problems, including four heart attacks, quadruple bypass surgery, two artery-clearing angioplasties and an operation to implant a defibrillator seven years ago.

After his physical examination last July, he had surgery to replace the defibrillator which monitors his heartbeat.

In November, he experienced an irregular heartbeat and doctors administered an electrical shock to his heart to restore it to a normal rhythm.

Mitchell said the physical would be conducted by doctors at George Washington University Hospital.