Supreme Court Justice Ruth Bader Ginsburg underwent a coronary catheterization procedure Friday morning, ABC News reported. The 81-year-old jurist had "experienced discomfort during routine exercise" on Tuesday evening, the network noted. She had been hospitalized after doctors discovered a blockage in her left coronary artery.

Ginsburg "had a stent placed in her right coronary artery at MedStar Washington Hospital Center. She was resting comfortably and was expected to be discharged within 48 hours," according to a statement issued by the U.S. Supreme Court.

"Ginsburg was appointed in 1993 by President Bill Clinton and is the oldest sitting justice," NBC News noted. "She has repeatedly and vigorously pushed back at those who have urged her to step down while President Barack Obama is still in office to appoint a successor."

"Despite being diagnosed with colon cancer in 1999 and pancreatic cancer in 2009, Ginsburg ... has never missed a day of oral arguments due to medical treatment," ABC News added. "In a recent interview with Yahoo's Katie Couric, Ginsburg said she'd continue to serve the Court "as long as I can do it full-steam," according to the network.

"When I feel myself slipping, when I can no longer think as sharply or write as quickly, that will be the time for me to leave the Court," she said last summer, according to ABC. "I'm still here and likely to remain for a while."

The Huffington Post pointed to an interview Ginsburg conceded the New Republic in September, in which the associate justice had said that she still works out with her trainer -- whom she shares with fellow Supreme Court Justice Elena Kagan -- twice a week.

"I do a variety of weight-lifting, elliptical glider, stretching exercises, push-ups," Ginsburg told the magazine. "And I do the Canadian Air Force exercises almost every day."

Ginsburg, a Brooklyn, New York, native, is a graduate of Cornell University and Harvard and Columbia law schools. Before ascending to the nation's highest court, she served as a judge on the U.S. of Appeals for the District of Columbia Circuit. Ginsburg's husband Martin, with whom she has two children, died in 2010 from cancer.