atrial fibrillation
![](https://a.espncdn.com/media/motion/2015/0604/dm_150604_Dodgers_Tweet/dm_150604_Dodgers_Tweet.jpg?w=660&r=16%3A9)
Don Mattingly says Kenley Jansen's absence was health precaution
The Dodgers explained the absence of Kenley Jansen from Wednesday's game by saying the closer underwent tests to rule out a recurrence of atrial fibrillation and sat out as a health precaution.