Sen. James Inhofe (R-Okla.) had emergency heart surgery on Friday and said his recovery is going well.
"During a routine doctor's visit last week, my doctor found that I had serious problems with my heart which resulted in quadruple bypass surgery this past Friday in Tulsa," Inhofe said in a statement, adding: "Today, I am feeling great and am fully engaged with my work here in Oklahoma."
Doctors discovered blockages in his arteries after Inhofe underwent a virtual colonoscopy, according to The Oklahoman.
Inhofe is not expected to return to Washington for a few days.
"I encourage my colleagues in Washington to work with vigilance to reopen the government with a bill that represents Oklahomans and all of Americans," Inhofe said. "I may miss some upcoming votes on the Continuing Resolution, but my doctors agree I will return soon and even stronger to continue the fight to protect Oklahomans' freedoms."
Inhofe announced in August that he would seek another term in 2014 and is not likely to face a difficult reelection race in deep-red Oklahoma.