Vice President Dick Cheney will receive an outpatient procedure later Wednesday to restore his normal heart rhythm. Doctors found a recurrence of atrial fibrillation, the White House said Wednesday.

Atrial fibrillation is an abnormal rhythm involving the upper chambers of the heart. Cheney's doctor discovered the problem Wednesdsay morning.

Last November, Cheney received the same procedure, which involves an electrical shock to his heart.

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 six years ago. In July 2007 he had surgery to replace the defibrillator that monitors his heartbeat.