boy you guys are reactionary. I am saying this is probably something that has flared up and Docs said give him a few days and AA said, no give him 15 so Twit doesn't over use him.. Once he gets back he should have better company in the pen to balance his work load to manage flare ups with his heart. I know two guys and one girl with the irregular heart beat. It is something they always have to deal with but can manage with meds and breaks between hard activities or stress. So once we have a few more weapons to play with, Twit can manage Kenley better when the heart acts up.
All that said, no one really knows how serious this is. Did he go to hospital after Dodger's game? But I am speculating that he is back with no issues once his time on DL is over.