Arnold Schwarzenegger, 70, has undergone emergency open-heart surgery after a failed valve replacement procedure.

Sources close to the Terminator actor said he went to Cedars-Sinai Medical Center in Los Angeles on Thursday to have a scheduled catheter valve replacement. The former governor of California developed complications during the risky procedure, leading to an emergency open-heart surgery that reportedly lasted several hours.

As of today, his condition following the operation was described as stable.