Doctors successfully implanted a pacemaker in Sen. George Voinovich of Ohio on Friday, June 20.

"The senator's procedure was uneventful and totally satisfactorily performed," said Dr. Helen Barold, who performed the operation. "I anticipate his recovery will be uncomplicated and that he will return to his normal routine in a few days."

Voinovich, 66, decided to have the optional procedure done to maintain a normal heart rate.

The Republican said earlier that week that his heart rate had slowed down over the past several years due to a condition called progressive sinus bradycardia.

Voinovich spent one night at the hospital, then rested over the weekend at his Washington apartment. He returned to a full schedule Monday.

"I have every expectation that he will be able to maintain his normal schedule and exercise," Barold also said.