Reliever Kenley Jansen, who landed on the disabled list in each of the last two seasons with an irregular heartbeat, underwent a surgical procedure on Tuesday to correct the problem.
Jansen is expected to be fully competitive at the start of spring training. Though Jansen will be on blood-thinning medication for the next two to three months, he will be able to throw and work out this winter without any restrictions. In fact, Jansen could probably start exercising in the next seven to 10 days.

