Sen. Jim Inhofe revealed early Tuesday that he underwent emergency quadruple bypass surgery over the weekend.

Inhofe, 78, R-Okla., said he was "shocked" at the discovery that he had serious problems with his heart. He was advised in Oklahoma Friday that he needed immediate surgery and underwent open heart surgery over the weekend.

"I had no visible symptoms that something was wrong," Inhofe said in a statement. "Today, I am feeling great and am fully engaged with my work here in Oklahoma."

Inhofe, the top-ranking Republican on the Senate Armed Services Committee, was told he had heart problems when he went to the doctor for a virtual colonoscopy. Doctors determined that two of his arteries had 100 percent blockage, two had 90 percent blockage and a fifth had 75 percent blockage, according to The Oklahoman.

"The doctors said, 'Your colon is perfect, but your heart is what we are worried about,'" Inhofe told The Tulsa World.

The Oklahoma Republican warned that he may miss some of the upcoming votes related to the government shutdown now underway, but that he “will return soon and even stronger to continue the fight to protect Oklahomans' freedoms.”