Kenley Jansen left the Dodgers’ spring training facility Friday after reporting symptoms a team spokesperson described as a “fluttering” heart.

Update (11:20 a.m.): Jansen returned to Camelback Ranch after being examined by Dr. John Monroe and played long toss under the supervision of team trainer Nancy Patterson. Afterward, Jansen said he felt fine, though he admitted the incident “scared me a little bit.”

“Last night I kind of woke up with my heart beating fast,” he said. “Not out of rhythm, but it was just going pretty fast.”

Jansen said an accelerated heart beat woke him up around 2:30 in the morning –“I didn’t dream about anything, I just woke up” — and the symptoms persisted for around 30-40 minutes. He felt well enough in the morning to report to camp, where he was given an EKG test, then was taken to see the doctor as a precaution.

The 24-year-old reliever was on the disabled list from June 29 to August 25 last year with a cardiac arrhythmia.

“I know they take his blood pressure twice a day,” Mattingly said. “I know he’s got medication. He’s not supposed to be having caffeine. There’s different things he’s supposed to stay away from.”

Jansen threw a scoreless inning Wednesday against the A’s. He will pitch his scheduled inning Saturday night against the Chicago White Sox.