LOS ANGELES -- Dodgers All-Star closer Kenley Jansen was activated off the disabled list on Monday after his latest heart scare, saying he won't be "babied" as he pitches the rest of the season, but also "90 percent" sure he will require a second offseason surgical procedure to resolve an irregular heartbeat. He appeared in Monday's contest, entering a tie game in the ninth inning and serving up back-to-back home runs to Jedd Gyorko and Matt Carpenter as the Cardinals took a 5-3 lead and held on to hand Jansen the loss.
In a corresponding move, left-handed pitcher Zachary Rosscup was placed on the 10-day disabled list with a left calf strain.
Jansen had his first ablation procedure after the 2012 season following an atrial fibrillation incident in Colorado, the same site of the one that put him on the disabled list Aug. 10. Jansen said his father also had heart disease.
But he said this episode might have been caused by dehydration. After passing a series of medical tests on Monday, he was taken off blood thinners by his cardiologist and cleared to pitch with "no restrictions."
"If I stay hydrated, I'll be fine," he said.

Jansen said he will continue daily EKG monitoring through a smartphone app, but he and manager Dave Roberts mostly agreed he won't be treated with kid gloves despite the health scare.
"I'm not thinking of my heart. If it goes, it goes," said Jansen. "I'm ready to go. Ain't no time here. We're two games back. Thirty-seven games left, we've got to go. I don't need to be babied. I'm not going to be babied. A four-out save, three-out save, five-out save, I'm ready."
Roberts said Jansen goes right back to being the closer, but he wasn't ready to commit to a multiple-inning appearance.
"He's hoping for that," said Roberts. "I haven't made that decision yet."
Jansen said if the offseason procedure finds no heart abnormalities, his recovery will be two weeks, not the three-month rehab he needed after the more involved 2012 procedure, in which a catheter ablation in the left atrium of Jansen's heart cauterized a damaged area to stop it from generating abnormal electrical signals.
Jansen's irreplaceability was underscored during his absence, as the Dodgers lost five games in the opponent's final at-bat.
"Right now, this puts guys in their rightful spots in the 'pen and [allows us to] use them in the way I feel is best," said Roberts. "He's the best in the game. So, to have him at the back changes the way they're going to manage and how our guys are going to be managed as well.
"It's a big lift, especially how this last week went. I know he's been antsy. For the guys to look around and know he's on the roster and when we do have a lead the game will be closed up, it's uplifting."
Roberts said Kenta Maeda -- moved from the rotation to the bullpen and considered a closer candidate when Jansen was out -- will join Scott Alexander pitching most of the leverage, or setup, innings.
"It's amazing what a guy like Kenley's presence does for the bullpen and things look right when he's back there," Roberts said.
Rosscup talks immaculate inning
Oregon native Rosscup said he left 19 tickets for family and friends on Sunday at Safeco Field, and they saw him finish a 12-1 Dodgers win over Seattle with the 93rd immaculate inning (nine pitches, nine strikes, three strikeouts) in history.
"[Catcher Austin] Barnes came out and said, 'That was nine pitches. That's a big deal,'" said Rosscup. "When I got the second out, I had it on my mind. Any reliever would try to do that. Three punches is what we dream about in the bullpen."

Rosscup said the only similar milestone of his career was a three-pitch inning in Rookie ball.