Dodgers closer Kenley Jansen was hospitalized with an irregular heartbeat prior to Thursday night's 8-5 win over the Rockies, and after initial tests, he flew back to Los Angeles, where he will meet with his cardiologist for additional tests on Friday. Jansen felt the heartbeat at the team hotel and never made it to Coors Field.

Manager Dave Roberts said that Jansen will not be available for the remainder of the four-game series in Denver.

"Any time you're talking about the heart, we obviously have to be very careful with it," Roberts said. "And then we're talking about altitude, so that's why we wanted to be proactive and get him back there. We're holding out hope that it's not too serious, but talking to the trainer right now, his mood is fine, you wouldn't know the difference, and once we get more testing, we'll know more."

Jansen has experienced heart problems in the past, going to the hospital for an irregular heartbeat in both 2011 and '12. He underwent heart surgery in October 2012, and hasn't had an episode since, according to Dodgers general manager Farhan Zaidi.